On 26.05.19 12:48, Dave Cole wrote:
>
> We still use BTU's for small Furnace and Air Conditioner sizing...
> For larger units its BTUs for furnaces and Tons of cooling for Air
> Conditioners.
The BTU is almost metric (within 6%):
$ units
You have: 1 btu
You want: kJ
* 1.0550559
Polish
> On 26 May 2019, at 17:48, Dave Cole wrote:
>
> MJs of gas would make way too much sense.
Moles of carbon would make even more sense.
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We still use BTU's for small Furnace and Air Conditioner sizing...
For larger units its BTUs for furnaces and Tons of cooling for Air
Conditioners.
Everyone knows that 12,000 btus is required to melt 1 ton of ice. Hence
12,000 btus is equal to "one ton" of cooling.
Who would have known that
On 21.05.19 16:17, grumpy--- via Emc-users wrote:
> i have no knowledge to add to this subject but it is all very good
> info for possible future projects i have been waiting for someone to
> add saltwater batteries to the discussion
The battery survey at one of the two links in my post on
On 5/21/19 7:17 AM, grumpy--- via Emc-users wrote:
i have no knowledge to add to this subject but it is all very good info
for possible future projects
i have been waiting for someone to add saltwater batteries to the
discussion
Alt-E used to sell these:
i have no knowledge to add to this subject but it is all very good info for
possible future projects
i have been waiting for someone to add saltwater batteries to the discussion
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On Mon, May 20, 2019 at 7:55 PM Erik Christiansen
wrote:
>
> Switching normal loads is back to less than 100 A for less than 5 kW, but
> still hard on contacts. (The contacts on the starter solenoid for an old
> Caterpillar D6 are blocks of copper with a mm of silver on the surface,
> to take
On Mon, May 20, 2019 at 3:25 AM Erik Christiansen
wrote:
> On 20.05.19 02:02, Chris Albertson wrote:
> > Total KWH meant if you have a 10 KHW battery and you chrage and
> discharge
> > it 200 times then you have 2000 "lifetime" KHW
> > If you can charge the battery 400 times then you have 4000
On 20.05.19 12:11, Chris Albertson wrote:
> How much DC current are we talking about?Let's say the house is running
> an air conditioning load and you are doing laundry and the 'fridge is
> cycling and you have a few computers on and every light build is turned on
> and you own a 200-gallon
> Wikipedia suggests that you still use BTUs for gas?
Unfortunately, yes. Fortunately, I don't have gas, so
can ignore that. Guess you can say we are more British
than the Brits, since we still use British Thermal Units.
-- Ralph
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On 19.05.19 09:43, Nicklas Karlsson wrote:
> For safety I learned relays fail open circuit while MOSFETs fail short
> circuited, I also experienced MOSFET short circuit failure. Happen to
> know anything more about this?
I'd only use the MOSFETs to replace relay contacts, and wire a HRC fuse
in
On 20.05.19 02:02, Chris Albertson wrote:
> Total KWH meant if you have a 10 KHW battery and you chrage and discharge
> it 200 times then you have 2000 "lifetime" KHW
> If you can charge the battery 400 times then you have 4000 "lifetime KWH.
> The second battery as twice as much value.
As a
On Mon, 20 May 2019 at 10:04, Chris Albertson
wrote:
What you just wrote almost what I wrote. Except that " big enough" is not
> a number you can put in a calculator.
>
> Cost per "KWh over the lifetime" is a very standard measure to define the
> value of a battery. I did not make it up.
My
On Sun, May 19, 2019 at 3:09 PM andy pugh wrote:
> On Sun, 19 May 2019 at 22:30, Chris Albertson
> wrote:
>
> > You just have to do a calculation, What is the cost per KWH over the
> > remaining
> > life of the battery.
>
>
> I am not sure that that is the correct calculation.
> What really
On Mon, 20 May 2019 at 02:50, Ralph Stirling
wrote:
>
> > (And, while we are at it, kWh is a horrible unit. What is wrong with MJ?
> )
>
> kWh is ubiquitous in the US.
They use them in the UK too. It doesn't make it any less irritating to a
physicist.
Wikipedia suggests that you still use
> (And, while we are at it, kWh is a horrible unit. What is wrong with MJ? )
kWh is ubiquitous in the US. Our electrical bills are all based on kWh.
Just be glad we don't use horsepower-hours :-/
-- Ralph
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On 5/19/19 5:25 PM, Bruce Layne wrote:
On 5/19/19 6:01 PM, Kirk Wallace wrote:
There are a lot of surplus Leaf batteries available. My opinion on
these is that these were removed for warranty replacement due to
overheating. These are air cooled and don't do well if they are
rapid charged
On 5/19/19 6:01 PM, Kirk Wallace wrote:
> There are a lot of surplus Leaf batteries available. My opinion on
> these is that these were removed for warranty replacement due to
> overheating. These are air cooled and don't do well if they are rapid
> charged more than once during long trips. I
Apparently you guys didn't notice that the Ebay guy selling Tesla cells
had already sold over a hundred of those battery packs.
So I doubt he got them from crashed Teslas.
To me buying a used Lithium battery makes only a little more sense than
buying a used Lead Acid battery.
I bet I could buy
There seems to be a pretty good supply of battery packs from wrecked Tesla
Model S cars, often with fairly low mileage. People have been taking those
apart to shoehorn the modules and one or both motor drivetrains into various
other vehicles. Of course by doing that they lose the crash
On Sun, 19 May 2019 at 22:30, Chris Albertson
wrote:
> You just have to do a calculation, What is the cost per KWH over the
> remaining
> life of the battery.
I am not sure that that is the correct calculation.
What really matters is that the battery is big enough for your purposes,
and then
On 5/19/19 9:34 AM, Dave Cole wrote:
I do have to wonder though... if these Tesla cells were no longer usable
for a Tesla, why would anyone think they would be good in a stationary
application unless they were derated by quite a bit.
$1200 is far from free.
Dave
My take on this is that
You just have to do a calculation, What is the cost per KWH over the
remaining
life of the battery. A new power wall costs $6,700 and has 13 KWH that
can be
cycled daily for 10 years. so 3650 days times 13KW = 47 megawat hours
for $6,700
or 14 cents per KWH.
DO the math on the used
That's what I understood... I won't be owning a Tesla until that changes.
Dave
On 5/18/2019 2:50 PM, Bruce Layne wrote:
Tesla has adopted the software
rental model where the customer doesn't really own anything.
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I do have to wonder though... if these Tesla cells were no longer usable
for a Tesla, why would anyone think they would be good in a stationary
application unless they were derated by quite a bit.
$1200 is far from free.
Dave
On 5/17/2019 12:24 PM, Kirk Wallace wrote:
Here is a fairly
I do have to wonder though... if these Tesla cells were no longer usable
for a Tesla, why would anyone think they would be good in a stationary
application unless they were derated by quite a bit.
$1200 is far from free.
Dave
On 5/17/2019 12:24 PM, Kirk Wallace wrote:
Here is a fairly
> > For safety I learned relays fail open circuit while MOSFETs fail short
> > circuited, I also experienced MOSFET short circuit failure. Happen to
> > know anything more about this?
> >
> It is for this reason that higher current dc loads, which will often be
> inductive are often of the t-bar
On Sunday 19 May 2019 03:43:45 am Nicklas Karlsson wrote:
> On Fri, 17 May 2019 20:23:57 +1000
>
> Erik Christiansen wrote:
> > On 16.05.19 21:18, Nicklas Karlsson wrote:
> > > > ...
> > > > I'd put the battery bank in an outbuilding. If something shorts
> > > > out and the battery bank melts
On Fri, 17 May 2019 20:23:57 +1000
Erik Christiansen wrote:
> On 16.05.19 21:18, Nicklas Karlsson wrote:
> > > ...
> > > I'd put the battery bank in an outbuilding. If something shorts out and
> > > the battery bank melts down, the little building may burn but my house
> > > won't.
> >
> >
But Rich's "Dolores" still supercharges, despite Tesla not providing any
support or most parts sales. He was (eventually) able to purchase some lug nut
covers after initially being denied - though he had to get them from two or
more places because for some reason no Tesla shop stocks enough for
It's interesting that Tesla maintains a record of all Tesla vehicles,
and once a car is scrapped, it's black listed in their records. There
is no factory support. The vehicles that were eligible for free
charging at Tesla Superchargers are barred from using the chargers, even
on a paying basis.
These look interesting. Caps that push onto the ends of 18650 cells then snap
together. Metal bus bars connect the cells in any configuration you want.
https://vruzend.com/
There are videos on YouTube from various people testing them. The connection
resistance is less than spring clips but
Look up Rich Rebuilds on YouTube. He built himself a really cheap Tesla Model S
by buying one that was in a flood and another that was rolled. Stripped the
flooded one of nearly everything, put the electrics and electronics from the
rolled one into it, then sold a bunch of leftover parts. Now
On Fri, May 17, 2019 at 3:05 AM Erik Christiansen
wrote:
> On 16.05.19 23:25, andy pugh wrote:
> > On Thu, 16 May 2019 at 23:07, Chris Albertson >
> > wrote:
> >
> >
> > > ill never beat Tesla's price. Even if you build a factory and mass
> > > produce them
> >
> >
> > So, let's turn that on
On 5/17/19 7:20 AM, Dave Cole wrote:
OK,
Buy a new "cheap" Tesla - about $35,800 right now.
Remove the battery pack ;-)
You guys on the west coast make it sound like you have Tesla's sitting
on the side of the road with "$500 or best offer" sale signs.
Here is a fairly common surplus
On Friday 17 May 2019 10:20:54 am Dave Cole wrote:
> OK,
> Buy a new "cheap" Tesla - about $35,800 right now.
> Remove the battery pack ;-)
>
> You guys on the west coast make it sound like you have Tesla's sitting
> on the side of the road with "$500 or best offer" sale signs.
>
> We now
OK,
Buy a new "cheap" Tesla - about $35,800 right now.
Remove the battery pack ;-)
You guys on the west coast make it sound like you have Tesla's sitting
on the side of the road with "$500 or best offer" sale signs.
We now have 11 supercharger stations in the state of Indiana.
If
Chris,
You need to look at the link... they look at the costs over a 10 year
period.
Including battery bank replacement for the Lead Acid batteries. Lead
Acid is still cheaper.
And I think their prices for Lead Acid batteries are inflated. I would
also consider using a Lead Acid forklift
DC power contactors are available. They are used in Golf Carts, Fork
Lifts etc.
But you are right, DC arcs are not easy to extinguish, and that can be a
problem.
BTW, most electric forklifts are still using Lead Acid batteries and
many have 5 year warranties on the batteries.
Most fork
On 16.05.19 21:18, Nicklas Karlsson wrote:
> > ...
> > I'd put the battery bank in an outbuilding. If something shorts out and
> > the battery bank melts down, the little building may burn but my house
> > won't.
>
> There certainly is a lot of power from a byttery and it could be a
> little
On 16.05.19 23:25, andy pugh wrote:
> On Thu, 16 May 2019 at 23:07, Chris Albertson
> wrote:
>
>
> > ill never beat Tesla's price. Even if you build a factory and mass
> > produce them
>
>
> So, let's turn that on its head. How can I run my cordless tools from Tesla
> cells...
IIRC, the
There are instructions all over Youtube for making battery packs from
generic LiPo cells.You need a 3D printer to make the case and then you
need to build a spot welder to wire the batteries together. Soldering does
not work.
Back when I owned a sailboat some years ago I used to keep a
On Thu, 16 May 2019 at 23:07, Chris Albertson
wrote:
> ill never beat Tesla's price. Even if you build a factory and mass
> produce them
So, let's turn that on its head. How can I run my cordless tools from Tesla
cells...
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and
Let's see your parts list for a 13.6 KWH system and let's look at the cost
over a 10 year period. List the charger/inverter and the frame and
housing.
When you do you costing assume the system is used cycled daily. Design in
enough margin so that tyou system still meets speciications after 10
How many tool batteries are needed to equal one Tesla Power Wall?
The biggest tool battery I have is the 18 volt ones for my skill saw. I
think it is 5 AH. So let's say 90 watt hours.
SO I can build a "Power Wall" if only I have 150 of these batteries. They
cost $120 each So I could build my
> ...
> I'd put the battery bank in an outbuilding. If something shorts out and
> the battery bank melts down, the little building may burn but my house
> won't.
There certainly is a lot of power from a byttery and it could be a little bit
hard to turn off. You put a fuse at battery cable? I
https://www.wholesalesolar.com/blog/lead-acid-vs-lithium-batteries/
This solar company wrote up this analysis regarding Lead Acid vs Lithium
and generally recommend Lead Acid for off grid residential use.
I went through their analysis and the only problem I had with it is that
their lead acid
One of these days I'm expecting to see someone build a power wall style
installation that uses lithium ion power tool batteries plugged into sockets.
Imagine a closet full of Ryobi ONE+ 18 volt batteries. Buy them used, old ones
on clearance etc. The practical aspect is the ONE+ batteries have
On Tue, May 14, 2019 at 10:54 AM Nicklas Karlsson <
nicklas.karlsso...@gmail.com> wrote:
> I have done calculations there storage cost for generated energy where
> higher than buying new electricity.
>
I depends on if you have time of use metering.Here where I live the
utilty price depends
On 5/14/19 9:33 AM, Dave Cole wrote:
I've been planning to put up an array on my roof. But I have plenty of
space so I may do a ground level install.
It would be a lot easier to maintain.
FLA batteries seem to be the general recommendation for a constant use
residential install.
In my
Great analysis, Chris. There's no way I'd use any lead acid battery
technology in a new off-the-grid solar power system.
A friend of mine replaced his old lead acid batteries with a home brewed
Tesla Power Wall, built from the battery from a wrecked Tesla Model S
automobile.
Part 1 (23
Redox flow batteries might be a cheaper alternative. It might be likely not all
available charging cycles are used for a long lasting battery. 20 cent per kWh
hour, price for electricity I found in USA is in the range 7 - 23 cents per
kWh, with an array on roof storage cost might be if you are
If you are building a battery-based power system and space and weight are
not issues then what you should care about is the "total watt-hours per
dollar".
Here is an example,... You have a 100 amp-hour lead-acid battery at 12
volts. If it is lead-acid then you can only discharge to 50% if you
I've been planning to put up an array on my roof. But I have plenty of
space so I may do a ground level install.
It would be a lot easier to maintain.
FLA batteries seem to be the general recommendation for a constant use
residential install.
I've had chargers trash batteries when they
On Thursday 09 May 2019 11:10:03 pm Erik Christiansen wrote:
> On 09.05.19 09:16, Gene Heskett wrote:
> > Good thinking Erik. I suppose the next Q is how far down is it to
> > the water table? And thats a job for a wind mill tower... But you
> > knew that. What would be neat is a big remote
On 09.05.19 09:16, Gene Heskett wrote:
> Good thinking Erik. I suppose the next Q is how far down is it to the
> water table? And thats a job for a wind mill tower... But you knew
> that. What would be neat is a big remote switch rod running up the tower
> to a clutch to disconnect the wheel
On 09.05.19 10:24, Dave Cole wrote:
>
> Erik,
>
> Do you have a blog going on your build?
Now that's an idea. All I've started is the seeds of an article for
"Owner Builder" magazine - the editor was interested when we last spoke.
> I'd be very interested in your solar and battery setup for
Erik,
Do you have a blog going on your build?
I'd be very interested in your solar and battery setup for your off-grid
home.
You must have a substantial setup to be able to run your AC off your
battery bank.
What do you do for domestic water? A deep well?
Dave
On 5/9/2019 5:17 AM,
On Thursday 09 May 2019 05:17:13 am Erik Christiansen wrote:
> On 09.05.19 09:58, Peter Blodow wrote:
> > there has been no incoming mail since May 6th?
> > Peter
>
> I was about to facetiously venture "Perhaps because Gene's been busy
>
> over on debian-user?", but there was a whole thread
On Thursday 09 May 2019 04:46:25 am Roland Jollivet wrote:
> Because no-one has posted anything?
>
> On Thu, 9 May 2019 at 10:17, Peter Blodow wrote:
> > there has been no incoming mail since May 6th?
> > Peter
I've been getting posts, although slow, about 14 since then.
I figure folks
On 09.05.19 09:58, Peter Blodow wrote:
> there has been no incoming mail since May 6th?
> Peter
I was about to facetiously venture "Perhaps because Gene's been busy
over on debian-user?", but there was a whole thread on:
>From emc-users-boun...@lists.sourceforge.net Tue May 7 13:03:40
Haha. It's good to ask anyway. A few months ago I got unsuscribed from the
list and don't know why.
El 9 may. 2019 07:36, "Roland Jollivet"
escribió:
> Because no-one has posted anything?
>
> On Thu, 9 May 2019 at 10:17, Peter Blodow wrote:
>
> > there has been no incoming mail since May
Because no-one has posted anything?
On Thu, 9 May 2019 at 10:17, Peter Blodow wrote:
> there has been no incoming mail since May 6th?
> Peter
>
>
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>
there has been no incoming mail since May 6th?
Peter
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