Re: [EVDL] Shorting a A123 26650 Cell
On 11/28/23 17:15, Cor van de Water via EV wrote: I always regard that PSA as bollocks, monitor my smoke alarms and when they beep or stop blinking the red light once a minute, *then* I replace the battery. Happens maybe every 5 years, so I am not trashing cells that are more than 90% capacity. My (networked) smoke alarms take 2 AA batteries, and if you let them go 2 years will randomly start to have false alarms (in the entire house, at night!), so I religiously change them out every year with a calendar reminder. I label the old AA's "LOW" with a sharpy and use them in kids toys without resenting the cost as they are now "free kids batteries". Jay ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Shorting a A123 26650 Cell
Lithium batteries are no joke. I personally have had more than one accident and many close calls despite being well aware of the danger and being very careful. My story involves a Nissan Leaf module. I had sat one upright against one of the steel compression plates and a table leg while assembling a battery. While working on the table vibrated it enough that the bottom of the module slid out and the top (with terminals) slid down the steel compression plate (sparking all the way). I kicked them apart (just) before it spot welded the terminals to the steel plate all my modules had electrical tape over the terminals after that Jay ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Shorting a A123 26650 Cell
Thanks Phil I grew up similarly as a kid with a huge junk pile in the basement of old parts from TVs and radios that I took apart and categorized that were donated from customers that were beyond repair. A fair amount of HeathKits and Edmund Scientific too. Following that to EV conversions, I still have a mechanical and electrical side of the garage with bins from A to Z that I used when converting ICE’s to EVs. Best regards Mark Sent from my iPhone On Nov 28, 2023, at 4:59 PM, (-Phil-) wrote: When I was a kid, my hobby was mostly electronics, (big surprise, right?) and I had a perpetually messy room (lab) that drove my Mother crazy. (Again, big surprise?) She constantly threatened to "go in there, clean it up and throw it all in the trash". One pre-teen day while I was at school, she finally made good on that promise and went in with a big black trash bag and started throwing "all that junk" into it. When I came home all the windows were open (unusual) and the whole area smelled really toxic. When I went in, it was even worse, and my room had about a 4 foot circle of burnt wet carpet and black melted junk all over it. She had thrown away a small NiCad pack and it somehow shorted out in the trash bag before she could haul it out, and caught fire. She was able to put it out (luckily) with some water.I was grounded for a month. She never attempted to touch my mess ever again though. Lithium batteries are no joke. I personally have had more than one accident and many close calls despite being well aware of the danger and being very careful. Sometimes it's not even in your control (like a cell defect). If you often use low-cost products with built-in Lithium, get a fire-safe bag and charge in it, and for large things try and do it outside. I now have a covered carport-type area away from the house which I will use for any even slightly questionable battery activities. Also, have good quality smoke detectors, preferably ones with wifi connectivity so you get an alert if something happens, such as these: https://amzn.to/3Glx8Nb Yes, Expensive, but way less than a homeowner's insurance deductible. One of these really saved an already bad accident I had from a total disaster. On Tue, Nov 28, 2023 at 1:37 PM Mark E. Hanson via EV wrote: > Hi Folks, > > > > I remember in 2013 I was designing a UPS for my employer and had a A123 > 26650 cell on my desk & walked away for a couple minutes to pee and when I > came back there was a crowd around as it apparently rolled into a spiral > notebook and set it on fire! > > > > Fairly embarrassed, but the other engineers were impressed by the amount of > current/destruction a single cell could do! > > > > > > Have a renewable energy day, > > > > Mark > > > > Mark E. Hanson > > 184 Vista Lane > > Fincastle, VA 24090 > > 540-473-1248 phone & FAX, 540-816-0812 cell > > REEVA: community service RE & EV project club > > Website: www.REEVAdiy.org (See Project Gallery) > > UL Certified PV Installer > > My RE Circuits: www.EVDL.org/lib/mh > > REEVA Demo: <http://youtu.be/4kqWn2H-rA0> http://youtu.be/4kqWn2H-rA0 > > > <https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd89 > 75b8d/signature> Fincastle Solar Weather Station > > > > > > > > Date: Mon, 27 Nov 2023 21:15:13 -0800 > > From: Cor van de Water <mailto:cor.vandewa...@gmail.com> > > > To: Electric Vehicle Discussion List <mailto:ev@lists.evdl.org> > > > Subject: Re: [EVDL] I destroyed an A123 26650 by shorting to the case. > > Message-ID: > > > <mailto:CALdL5i3dyE3nJBu==mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com> > > > > Content-Type: text/plain; charset="utf-8" > > > > Lawrence, when I removed some of the cells from that pack that you picked > up, I cut the straps with heavy duty scissors. > > One time I accidentally shorted the cell I was removing while cutting and > the current was large enough to bite a chunk out of the scissor blades... > > These are *very* low resistance cells, so the short circuit current > consequently is very high, even at the low 3.5V of a single cell. > > Cor. > > > > > > -- next part -- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/5f857a93/attachment.htm> > ___ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/54b592a3/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Shorting a A123 26650 Cell
gt; > Date: Mon, 27 Nov 2023 21:15:13 -0800 > > > > > > From: Cor van de Water > > <mailto:cor.vandewa...@gmail.com> > > > > > > > To: Electric Vehicle Discussion List > > <mailto:ev@lists.evdl.org> > > > > > > > Subject: Re: [EVDL] I destroyed an A123 26650 by shorting to the case. > > > > > > Message-ID: > > > > > > > > > > > <mailto:CALdL5i3dyE3nJBu== > > mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com > > > > > > > > > > > > > > Content-Type: text/plain; charset="utf-8" > > > > > > > > > > > > Lawrence, when I removed some of the cells from that pack that you > picked > > > up, I cut the straps with heavy duty scissors. > > > > > > One time I accidentally shorted the cell I was removing while cutting > and > > > the current was large enough to bite a chunk out of the scissor > blades... > > > > > > These are *very* low resistance cells, so the short circuit current > > > consequently is very high, even at the low 3.5V of a single cell. > > > > > > Cor. > > > > > > > > > > > > > > > > > > -- next part -- > > > An HTML attachment was scrubbed... > > > URL: < > > > > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/5f857a93/attachment.htm > > > > > > > ___ > > > Address messages to ev@lists.evdl.org > > > No other addresses in TO and CC fields > > > HELP: http://www.evdl.org/help/ > > > > > > > > -- next part -- > > An HTML attachment was scrubbed... > > URL: < > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/d3958161/attachment.htm > > > > > ___ > > Address messages to ev@lists.evdl.org > > No other addresses in TO and CC fields > > HELP: http://www.evdl.org/help/ > > > > > -- next part -- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/77117140/attachment.htm > > > ___ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/f91ca9fa/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] I destroyed an A123 26650 by shorting to the case.
Well I think I can do you all one better, or worse as the case may be. I had eight A123 86 volt, 5 kWh battery modules in my electric conversion and managed to accidentally leave the key turned on overnight. Result, at least four of the modules developed one parallel cell group of three cells that would not come back when charging the pack. The modules are made up of 78 pouch cells divided into 26s3p. So after weeks of therapy, I started wondering what I could do with all these modules and cells. My question is, has anyone ever tried to rebuild or replace pouch cells in A123 modules? The cells seem to be welded in some areas with metal connections that might be crimped to the taps on the individual cells. Any and all comments appreciated. David On Tuesday, November 28, 2023 at 06:17:20 AM PST, Bill Dube via EV wrote: The A123 26650 M1-B cells will throw over 200 amps to a short circuit. Considerably more if they are at optimum temperature. :-) The short circuit current will actually go up as the cell heats up. This assumes that whatever caused the short hasn't vaporized These are _very_ well designed cells. They will last over 10,000 cycles BTW. 100% discharge and charge at 1C rate, 20 Celsius, and retain more than 50% of the original capacity. No Joke. Bill D. On 11/28/2023 6:15 PM, Cor van de Water via EV wrote: > Lawrence, when I removed some of the cells from that pack that you picked > up, I cut the straps with heavy duty scissors. > One time I accidentally shorted the cell I was removing while cutting and > the current was large enough to bite a chunk out of the scissor blades... > These are *very* low resistance cells, so the short circuit current > consequently is very high, even at the low 3.5V of a single cell. > Cor. > > On Mon, Nov 27, 2023, 9:06 PM Lawrence Rhodes via EV > wrote: > >> https://youtu.be/zEXx_2Caefc?si=j66-Advfy42A7-Aq I wasn't too careful >> separating some cells. Nicked a few. Used in flashlights they are awesome. >> However, I nicked a few near the base and my hacked flashlight spring >> shorted the cell. Smoke and brown fluid. Oops. I will tape nicks and avoid >> making them in the future. Also use an adapter of pvc for extra safety. >> Lawrence Rhodes >> -- next part -- >> An HTML attachment was scrubbed... >> URL: < >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/4e279d1a/attachment.htm >> ___ >> Address messages to ev@lists.evdl.org >> No other addresses in TO and CC fields >> HELP: http://www.evdl.org/help/ >> >> > -- next part -- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231127/7ee8eea4/attachment.htm> > ___ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/ -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/60a55b5c/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Shorting a A123 26650 Cell
Remember the crazy PSA to replace your (almost new, what a waste!) smoke alarm battery every half year? True story: one guy did that faithfully, collected all those nearly-new batteries for recycling in a baggie and... set his house on fire. Note that this were the puny 9v cells! I always regard that PSA as bollocks, monitor my smoke alarms and when they beep or stop blinking the red light once a minute, *then* I replace the battery. Happens maybe every 5 years, so I am not trashing cells that are more than 90% capacity. Again: what an organised waste! Cor. On Tue, Nov 28, 2023, 1:59 PM (-Phil-) via EV wrote: > When I was a kid, my hobby was mostly electronics, (big surprise, right?) > and I had a perpetually messy room (lab) that drove my Mother crazy. > (Again, big surprise?) She constantly threatened to "go in there, clean it > up and throw it all in the trash". One pre-teen day while I was at > school, she finally made good on that promise and went in with a big black > trash bag and started throwing "all that junk" into it. When I came home > all the windows were open (unusual) and the whole area smelled really > toxic. When I went in, it was even worse, and my room had about a 4 foot > circle of burnt wet carpet and black melted junk all over it. > > She had thrown away a small NiCad pack and it somehow shorted out in the > trash bag before she could haul it out, and caught fire. She was able to > put it out (luckily) with some water.I was grounded for a month. She > never attempted to touch my mess ever again though. > > Lithium batteries are no joke. I personally have had more than one > accident and many close calls despite being well aware of the danger and > being very careful. Sometimes it's not even in your control (like a cell > defect). If you often use low-cost products with built-in Lithium, get a > fire-safe bag and charge in it, and for large things try and do it > outside. I now have a covered carport-type area away from the house which > I will use for any even slightly questionable battery activities. Also, > have good quality smoke detectors, preferably ones with wifi connectivity > so you get an alert if something happens, such as these: > https://amzn.to/3Glx8Nb Yes, Expensive, but way less than a homeowner's > insurance deductible. One of these really saved an already bad accident I > had from a total disaster. > > On Tue, Nov 28, 2023 at 1:37 PM Mark E. Hanson via EV > wrote: > > > Hi Folks, > > > > > > > > I remember in 2013 I was designing a UPS for my employer and had a A123 > > 26650 cell on my desk & walked away for a couple minutes to pee and when > I > > came back there was a crowd around as it apparently rolled into a spiral > > notebook and set it on fire! > > > > > > > > Fairly embarrassed, but the other engineers were impressed by the amount > of > > current/destruction a single cell could do! > > > > > > > > > > > > Have a renewable energy day, > > > > > > > > Mark > > > > > > > > Mark E. Hanson > > > > 184 Vista Lane > > > > Fincastle, VA 24090 > > > > 540-473-1248 phone & FAX, 540-816-0812 cell > > > > REEVA: community service RE & EV project club > > > > Website: www.REEVAdiy.org (See Project Gallery) > > > > UL Certified PV Installer > > > > My RE Circuits: www.EVDL.org/lib/mh > > > > REEVA Demo: <http://youtu.be/4kqWn2H-rA0> http://youtu.be/4kqWn2H-rA0 > > > > > > < > > > https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd89 > > 75b8d/signature > > < > https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd8975b8d/signature > >> > > Fincastle Solar Weather Station > > > > > > > > > > > > > > > > Date: Mon, 27 Nov 2023 21:15:13 -0800 > > > > From: Cor van de Water > <mailto:cor.vandewa...@gmail.com> > > > > > To: Electric Vehicle Discussion List > <mailto:ev@lists.evdl.org> > > > > > Subject: Re: [EVDL] I destroyed an A123 26650 by shorting to the case. > > > > Message-ID: > > > > > > > <mailto:CALdL5i3dyE3nJBu== > mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com > > > > > > > > > > Content-Type: text/plain; charset="utf-8" > > > > > > > > Lawrence, when I removed some of the cells from that pack that you picked > > up, I cut the straps with heavy duty scissors. > > > > One time I accidentally shorted the cell I was r
Re: [EVDL] Shorting a A123 26650 Cell
When I was a kid, my hobby was mostly electronics, (big surprise, right?) and I had a perpetually messy room (lab) that drove my Mother crazy. (Again, big surprise?) She constantly threatened to "go in there, clean it up and throw it all in the trash". One pre-teen day while I was at school, she finally made good on that promise and went in with a big black trash bag and started throwing "all that junk" into it. When I came home all the windows were open (unusual) and the whole area smelled really toxic. When I went in, it was even worse, and my room had about a 4 foot circle of burnt wet carpet and black melted junk all over it. She had thrown away a small NiCad pack and it somehow shorted out in the trash bag before she could haul it out, and caught fire. She was able to put it out (luckily) with some water.I was grounded for a month. She never attempted to touch my mess ever again though. Lithium batteries are no joke. I personally have had more than one accident and many close calls despite being well aware of the danger and being very careful. Sometimes it's not even in your control (like a cell defect). If you often use low-cost products with built-in Lithium, get a fire-safe bag and charge in it, and for large things try and do it outside. I now have a covered carport-type area away from the house which I will use for any even slightly questionable battery activities. Also, have good quality smoke detectors, preferably ones with wifi connectivity so you get an alert if something happens, such as these: https://amzn.to/3Glx8Nb Yes, Expensive, but way less than a homeowner's insurance deductible. One of these really saved an already bad accident I had from a total disaster. On Tue, Nov 28, 2023 at 1:37 PM Mark E. Hanson via EV wrote: > Hi Folks, > > > > I remember in 2013 I was designing a UPS for my employer and had a A123 > 26650 cell on my desk & walked away for a couple minutes to pee and when I > came back there was a crowd around as it apparently rolled into a spiral > notebook and set it on fire! > > > > Fairly embarrassed, but the other engineers were impressed by the amount of > current/destruction a single cell could do! > > > > > > Have a renewable energy day, > > > > Mark > > > > Mark E. Hanson > > 184 Vista Lane > > Fincastle, VA 24090 > > 540-473-1248 phone & FAX, 540-816-0812 cell > > REEVA: community service RE & EV project club > > Website: www.REEVAdiy.org (See Project Gallery) > > UL Certified PV Installer > > My RE Circuits: www.EVDL.org/lib/mh > > REEVA Demo: <http://youtu.be/4kqWn2H-rA0> http://youtu.be/4kqWn2H-rA0 > > > < > https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd89 > 75b8d/signature > <https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd8975b8d/signature>> > Fincastle Solar Weather Station > > > > > > > > Date: Mon, 27 Nov 2023 21:15:13 -0800 > > From: Cor van de Water <mailto:cor.vandewa...@gmail.com> > > > To: Electric Vehicle Discussion List <mailto:ev@lists.evdl.org> > > > Subject: Re: [EVDL] I destroyed an A123 26650 by shorting to the case. > > Message-ID: > > > <mailto:CALdL5i3dyE3nJBu==mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com > > > > > > Content-Type: text/plain; charset="utf-8" > > > > Lawrence, when I removed some of the cells from that pack that you picked > up, I cut the straps with heavy duty scissors. > > One time I accidentally shorted the cell I was removing while cutting and > the current was large enough to bite a chunk out of the scissor blades... > > These are *very* low resistance cells, so the short circuit current > consequently is very high, even at the low 3.5V of a single cell. > > Cor. > > > > > > -- next part -- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/5f857a93/attachment.htm > > > ___ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/d3958161/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
[EVDL] Shorting a A123 26650 Cell
Hi Folks, I remember in 2013 I was designing a UPS for my employer and had a A123 26650 cell on my desk & walked away for a couple minutes to pee and when I came back there was a crowd around as it apparently rolled into a spiral notebook and set it on fire! Fairly embarrassed, but the other engineers were impressed by the amount of current/destruction a single cell could do! Have a renewable energy day, Mark Mark E. Hanson 184 Vista Lane Fincastle, VA 24090 540-473-1248 phone & FAX, 540-816-0812 cell REEVA: community service RE & EV project club Website: www.REEVAdiy.org (See Project Gallery) UL Certified PV Installer My RE Circuits: www.EVDL.org/lib/mh REEVA Demo: <http://youtu.be/4kqWn2H-rA0> http://youtu.be/4kqWn2H-rA0 <https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd89 75b8d/signature> Fincastle Solar Weather Station Date: Mon, 27 Nov 2023 21:15:13 -0800 From: Cor van de Water mailto:cor.vandewa...@gmail.com> > To: Electric Vehicle Discussion List mailto:ev@lists.evdl.org> > Subject: Re: [EVDL] I destroyed an A123 26650 by shorting to the case. Message-ID: mailto:CALdL5i3dyE3nJBu==mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" Lawrence, when I removed some of the cells from that pack that you picked up, I cut the straps with heavy duty scissors. One time I accidentally shorted the cell I was removing while cutting and the current was large enough to bite a chunk out of the scissor blades... These are *very* low resistance cells, so the short circuit current consequently is very high, even at the low 3.5V of a single cell. Cor. -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/5f857a93/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Overheating Tesla display
Yeah on Model 3/Y and 2021+ S/X it's only minimal screen electronics and ser/des glue to encode/decode touch and video in the screen itself. All the expensive bits are liquid cooled. I can't promise that the screens will last forever in hot climates, but they should be way more reliable than in other newer cars where the computer is still part of the screen assembly. If it does fail, it's pretty cheap to pop a used one in there, only takes a few minutes, and no software is involved. Will probably cost less than $500. The best you can do for avoidance is obvious, park inside/in shade, or at least cover/tint, or run cabin overheat protection. I think the screen will last the effective life of the car if those reasonable precautions are taken. (I park my Tesla in a garage) As for microinverters, I am somewhat against them from a reliability standpoint, the temp cycling is extreme, and it's hard to make them very reliable, though enPhase has done a good job. On my system I use a SMA inverter with series-strings, and the inverter is inside a climate controlled shop. With the newer rapid disconnect requirements, series-string is now less attractive, because you still have to have power electronics on the roof, but luckily my system was before that. On Tue, Nov 28, 2023 at 11:58 AM wrote: > Thanks Phil. > > > > Good info - assuming there's *no* electrolytic caps inside that tend to > dry out & fail *over time* when hot. > > > > There's some folks with heat related screen issues over time in hotter > areas than Viginia (like Florida, Aridzona) - solution to tint > windshield/also sun shade when parked: > > > https://teslamotorsclub.com/tmc/threads/unresponsive-screen-in-the-heat.273151/ > > > > Looks like Tesla did what they usually do, try & fix it in a "free" > software update (although this appears to be a different issue than sun > overheating): > > > https://driveteslacanada.ca/news/tesla-recall-overheating-infotainment-display/ > > > > Last year I went through a similar issue with my older (M series) Enphase > solar microinverters (mounted 1" from the back of solar panels) that some > were dying in our new 100F+ (37.7C) heat (since global warming has become > popular), found that the caps were cooking - since the inverters were > mounted flat behind the solar panels, running about 100C. Mounting them > sideways (perpendicular to the panels) lowered their temp 20F and stopped > the failures. > > > > Anyway, just thinking for longevity - I should figure out how to make the > screen run cooler. > > > > > > Have a renewable energy day, > > > > Mark > > > > Mark E. Hanson > > 184 Vista Lane > > Fincastle, VA 24090 > > 540-473-1248 phone & FAX, 540-816-0812 cell > > REEVA: community service RE & EV project club > > Website: www.REEVAdiy.org (See Project Gallery) > > *UL* Certified PV Installer > > My RE Circuits: www.EVDL.org/lib/mh > > REEVA Demo: http://youtu.be/4kqWn2H-rA0 > > Fincastle Solar Weather Station > <https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd8975b8d/signature> > > > > > > > > *From:* (-Phil-) > *Sent:* Tuesday, November 28, 2023 1:36 PM > *To:* Mark Hanson > *Cc:* ev@lists.evdl.org > *Subject:* Re: [EVDL] Overheating Tesla display > > > > Oh, in the sun I'm sure the solar radiation is the biggest problem. Test > it in the shade and you'll see it barely gets warm. > > > > There is no danger from letting it get hot, again on your car there is no > computer in there, it's just a screen. The computer is behind the > glovebox on the firewall and it's liquid-cooled. > > > > On Tue, Nov 28, 2023 at 4:30 AM Mark Hanson > wrote: > > Thanks Phil > So sounds like most of the heat is coming from the leds that brighten up > when sunny, not the sun itself. I thought of Epoxying a big finned heat > sink on the back. > Best regards > Mark > > Sent from my iPhone > > On Nov 27, 2023, at 2:21 PM, (-Phil-) wrote: > > -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/095fef74/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Overheating Tesla display
Thanks Phil. Good info - assuming there's *no* electrolytic caps inside that tend to dry out & fail *over time* when hot. There's some folks with heat related screen issues over time in hotter areas than Viginia (like Florida, Aridzona) - solution to tint windshield/also sun shade when parked: https://teslamotorsclub.com/tmc/threads/unresponsive-screen-in-the-heat.273151/ Looks like Tesla did what they usually do, try & fix it in a "free" software update (although this appears to be a different issue than sun overheating): https://driveteslacanada.ca/news/tesla-recall-overheating-infotainment-display/ Last year I went through a similar issue with my older (M series) Enphase solar microinverters (mounted 1" from the back of solar panels) that some were dying in our new 100F+ (37.7C) heat (since global warming has become popular), found that the caps were cooking - since the inverters were mounted flat behind the solar panels, running about 100C. Mounting them sideways (perpendicular to the panels) lowered their temp 20F and stopped the failures. Anyway, just thinking for longevity - I should figure out how to make the screen run cooler. Have a renewable energy day, Mark Mark E. Hanson 184 Vista Lane Fincastle, VA 24090 540-473-1248 phone & FAX, 540-816-0812 cell REEVA: community service RE & EV project club Website: www.REEVAdiy.org <http://www.REEVAdiy.org> (See Project Gallery) UL Certified PV Installer My RE Circuits: www.EVDL.org/lib/mh REEVA Demo: http://youtu.be/4kqWn2H-rA0 Fincastle Solar Weather Station <https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd8975b8d/signature> From: (-Phil-) Sent: Tuesday, November 28, 2023 1:36 PM To: Mark Hanson Cc: ev@lists.evdl.org Subject: Re: [EVDL] Overheating Tesla display Oh, in the sun I'm sure the solar radiation is the biggest problem. Test it in the shade and you'll see it barely gets warm. There is no danger from letting it get hot, again on your car there is no computer in there, it's just a screen. The computer is behind the glovebox on the firewall and it's liquid-cooled. On Tue, Nov 28, 2023 at 4:30 AM Mark Hanson mailto:markehans...@gmail.com> > wrote: Thanks Phil So sounds like most of the heat is coming from the leds that brighten up when sunny, not the sun itself. I thought of Epoxying a big finned heat sink on the back. Best regards Mark Sent from my iPhone On Nov 27, 2023, at 2:21 PM, (-Phil-) mailto:p...@ingineerix.com> > wrote: -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/d4f14d10/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Overheating Tesla display
Oh, in the sun I'm sure the solar radiation is the biggest problem. Test it in the shade and you'll see it barely gets warm. There is no danger from letting it get hot, again on your car there is no computer in there, it's just a screen. The computer is behind the glovebox on the firewall and it's liquid-cooled. On Tue, Nov 28, 2023 at 4:30 AM Mark Hanson wrote: > Thanks Phil > So sounds like most of the heat is coming from the leds that brighten up > when sunny, not the sun itself. I thought of Epoxying a big finned heat > sink on the back. > Best regards > Mark > > Sent from my iPhone > > On Nov 27, 2023, at 2:21 PM, (-Phil-) wrote: > > -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/f36f917f/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] I destroyed an A123 26650 by shorting to the case.
The A123 26650 M1-B cells will throw over 200 amps to a short circuit. Considerably more if they are at optimum temperature. :-) The short circuit current will actually go up as the cell heats up. This assumes that whatever caused the short hasn't vaporized These are _very_ well designed cells. They will last over 10,000 cycles BTW. 100% discharge and charge at 1C rate, 20 Celsius, and retain more than 50% of the original capacity. No Joke. Bill D. On 11/28/2023 6:15 PM, Cor van de Water via EV wrote: Lawrence, when I removed some of the cells from that pack that you picked up, I cut the straps with heavy duty scissors. One time I accidentally shorted the cell I was removing while cutting and the current was large enough to bite a chunk out of the scissor blades... These are *very* low resistance cells, so the short circuit current consequently is very high, even at the low 3.5V of a single cell. Cor. On Mon, Nov 27, 2023, 9:06 PM Lawrence Rhodes via EV wrote: https://youtu.be/zEXx_2Caefc?si=j66-Advfy42A7-Aq I wasn't too careful separating some cells. Nicked a few. Used in flashlights they are awesome. However, I nicked a few near the base and my hacked flashlight spring shorted the cell. Smoke and brown fluid. Oops. I will tape nicks and avoid making them in the future. Also use an adapter of pvc for extra safety. Lawrence Rhodes -- next part -- An HTML attachment was scrubbed... URL: < http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/4e279d1a/attachment.htm ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/ -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231127/7ee8eea4/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/ ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Overheating Tesla display
Thanks Phil So sounds like most of the heat is coming from the leds that brighten up when sunny, not the sun itself. I thought of Epoxying a big finned heat sink on the back. Best regards Mark Sent from my iPhone On Nov 27, 2023, at 2:21 PM, (-Phil-) wrote: ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
