Re: [EVDL] Momentary Pulse Switch
> reed switch with a magnet on the fuel door would do the trick. > > Phil That's a great idea. Setup the reed so the magnet closes it when the door is 1/2 way open. That way you get the 'pulse' without any other components and the reed isn't spending large amounts of time in the magnetic field. Long term exposure to magnetic fields can magnetize reed switches and they will get stuck closed. ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Re: [EVDL] BMS question
I was just looking into this recently. There appear to be two types of cheap BMS systems, ones that just equalize when the batteries near full charge (put a small load, 40-70mv, on cells when they get over 4.1V) and the other type is typically called an "Active Balancer" it runs continuously and shuffles around charges when the cells differ by more than 10mv, many of these can move up to 1-2Amps I think the active ones sound like a better solution, although if you have a well matched series of cells a top balancer might be adequate. Here is an example of an active balancer: https://www.aliexpress.com/item/1005002950596126.html I have no idea how reliable these are, but at that price it's cheap enough to buy and test. I also like that this particular model has a switch where you can disable the balancer action if the cell voltage drops below 3V, that way your balancer won't drain a dead battery. Note: the above model does NOT handle over charge or over discharge. That may not be an issue if your battery charger can limit it's max voltage and if your motor controller can automatically shut off when battery voltage drops below a set level. My PGP public key: https://vanderwal.us/evdl_pgp.key October 6, 2021 4:25 PM, "steve sawtelle via EV" wrote: > I guess this may qualify as an old-school question now. > > About 12 years ago I built an electric motorcycle. I actually had it up and > running, but other > things got in the way and I am abandoning the project. The rolling chassis > will get back it's ICE > and I need to find a home for the 7" Jim Husted motor and the controls. I > have a new endeavor now - > a small cruising sailboat (CLC Pocketship). I'm thinking of using a trolling > motor as the backup to > the sails and I hope to repurpose some of my 100 A-H Thundersky batteries for > power. My batteries > have been sitting for 10 years but still are at around 3.25V. I need to cycle > them to see if they > are still viable of course. If they are, what BMS is recommended for them > now? I did a bit of > searching but didn't see much. > > -steve > ___ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Re: [EVDL] BMS question
For just a few batteries, I'd look at what the Radio Control guys use. I think they have built in BMS and some are programmable.Being as you are only going to have 4 (for 12 volt trolling), I think you could get a complete solution cheap. I think they use differentterminology like "4S" for 4 in series. Larry p.s. From experience. Get a 50amp or above trolling motor. Small ones are "okay" in light winds, but if you've got to buck a 20mph wind, you'd be much happier with a larger one when it's blowing. yes it's ev blasphemy but I'd also look at a metal pair of oarlocks and moderately decent 2-part oars. Always good to have several power sourcesif you get stuck in a shipping channel with no wind. You don't have to do anything fancy with a sliding seat. You can row standing up or sitting on a cooler or anything temporary. It's a "LOT" better than a canoe paddle. You may find it's even better than thetrolling motor as you can save the electricity for lights and radio and gps. Expect only about 2 knots rowing. On Thursday, October 7, 2021, 2:57:46 PM PDT, steve sawtelle via EV wrote: Thanks all for the advise and ideas. I joined the Electricboats list - excellent resource! There is also a PlugBoats website/journal which looks good. I borrowed our electronic load from work and will cycle a few batteries to see what I have. Good to know it may take a few cycles to see where they are at. I also found an excellent resource on Lithium batteries on boats: https://nordkyndesign.com/category/marine-engineering/electrical/lithium-battery-systems/ Very thoughtful look at what it takes to make a good BMS. It's not easy. I'm hoping to do slow charge from a small solar panel and use the batteries weekly. It looks like it may be a bit hard to make that work really well. Well, part of why I do things like this is to learn -steve On Thursday, October 7, 2021, 11:15:12 AM EDT, paul dove via EV wrote: I don't know anything about BMS's but Lithium Iron Phosphate cells can experience capacity fade even if they have good voltage. I had some cells that sat around for a year and a half and showed good voltage but when I cycles them they only had 45Ah out of 100Ah they started with. I thought I ruined them but I got back 100% of the capacity after the 5th cycle so just note you may need to cycle more than once. On Thursday, October 7, 2021, 8:11:11 AM CDT, Rod Hower via EV wrote: There are great resources for electric powered sail boats at electricbo...@groups.io https://groups.io/g/electricboats On Wednesday, October 6, 2021, 07:25:44 PM EDT, steve sawtelle via EV wrote: I guess this may qualify as an old-school question now. About 12 years ago I built an electric motorcycle. I actually had it up and running, but other things got in the way and I am abandoning the project. The rolling chassis will get back it's ICE and I need to find a home for the 7" Jim Husted motor and the controls. I have a new endeavor now - a small cruising sailboat (CLC Pocketship). I'm thinking of using a trolling motor as the backup to the sails and I hope to repurpose some of my 100 A-H Thundersky batteries for power. My batteries have been sitting for 10 years but still are at around 3.25V. I need to cycle them to see if they are still viable of course. If they are, what BMS is recommended for them now? I did a bit of searching but didn't see much. -steve ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/9c9f97d0/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/c2aa0842/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/da3eaa4d/attachment.
Re: [EVDL] BMS question
Thanks all for the advise and ideas. I joined the Electricboats list - excellent resource! There is also a PlugBoats website/journal which looks good. I borrowed our electronic load from work and will cycle a few batteries to see what I have. Good to know it may take a few cycles to see where they are at. I also found an excellent resource on Lithium batteries on boats: https://nordkyndesign.com/category/marine-engineering/electrical/lithium-battery-systems/ Very thoughtful look at what it takes to make a good BMS. It's not easy. I'm hoping to do slow charge from a small solar panel and use the batteries weekly. It looks like it may be a bit hard to make that work really well. Well, part of why I do things like this is to learn -steve On Thursday, October 7, 2021, 11:15:12 AM EDT, paul dove via EV wrote: I don't know anything about BMS's but Lithium Iron Phosphate cells can experience capacity fade even if they have good voltage. I had some cells that sat around for a year and a half and showed good voltage but when I cycles them they only had 45Ah out of 100Ah they started with. I thought I ruined them but I got back 100% of the capacity after the 5th cycle so just note you may need to cycle more than once. On Thursday, October 7, 2021, 8:11:11 AM CDT, Rod Hower via EV wrote: There are great resources for electric powered sail boats at electricbo...@groups.io https://groups.io/g/electricboats On Wednesday, October 6, 2021, 07:25:44 PM EDT, steve sawtelle via EV wrote: I guess this may qualify as an old-school question now. About 12 years ago I built an electric motorcycle. I actually had it up and running, but other things got in the way and I am abandoning the project. The rolling chassis will get back it's ICE and I need to find a home for the 7" Jim Husted motor and the controls. I have a new endeavor now - a small cruising sailboat (CLC Pocketship). I'm thinking of using a trolling motor as the backup to the sails and I hope to repurpose some of my 100 A-H Thundersky batteries for power. My batteries have been sitting for 10 years but still are at around 3.25V. I need to cycle them to see if they are still viable of course. If they are, what BMS is recommended for them now? I did a bit of searching but didn't see much. -steve ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/9c9f97d0/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/c2aa0842/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/da3eaa4d/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Re: [EVDL] BMS question
I don't know anything about BMS's but Lithium Iron Phosphate cells can experience capacity fade even if they have good voltage. I had some cells that sat around for a year and a half and showed good voltage but when I cycles them they only had 45Ah out of 100Ah they started with. I thought I ruined them but I got back 100% of the capacity after the 5th cycle so just note you may need to cycle more than once. On Thursday, October 7, 2021, 8:11:11 AM CDT, Rod Hower via EV wrote: There are great resources for electric powered sail boats at electricbo...@groups.io https://groups.io/g/electricboats On Wednesday, October 6, 2021, 07:25:44 PM EDT, steve sawtelle via EV wrote: I guess this may qualify as an old-school question now. About 12 years ago I built an electric motorcycle. I actually had it up and running, but other things got in the way and I am abandoning the project. The rolling chassis will get back it's ICE and I need to find a home for the 7" Jim Husted motor and the controls. I have a new endeavor now - a small cruising sailboat (CLC Pocketship). I'm thinking of using a trolling motor as the backup to the sails and I hope to repurpose some of my 100 A-H Thundersky batteries for power. My batteries have been sitting for 10 years but still are at around 3.25V. I need to cycle them to see if they are still viable of course. If they are, what BMS is recommended for them now? I did a bit of searching but didn't see much. -steve ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/9c9f97d0/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/c2aa0842/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Re: [EVDL] BMS question
There are great resources for electric powered sail boats at electricbo...@groups.io https://groups.io/g/electricboats On Wednesday, October 6, 2021, 07:25:44 PM EDT, steve sawtelle via EV wrote: I guess this may qualify as an old-school question now. About 12 years ago I built an electric motorcycle. I actually had it up and running, but other things got in the way and I am abandoning the project. The rolling chassis will get back it's ICE and I need to find a home for the 7" Jim Husted motor and the controls. I have a new endeavor now - a small cruising sailboat (CLC Pocketship). I'm thinking of using a trolling motor as the backup to the sails and I hope to repurpose some of my 100 A-H Thundersky batteries for power. My batteries have been sitting for 10 years but still are at around 3.25V. I need to cycle them to see if they are still viable of course. If they are, what BMS is recommended for them now? I did a bit of searching but didn't see much. -steve ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211007/9c9f97d0/attachment.html> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org