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many 1s 120p packs in series to 48v
#11
(11-05-2019, 01:38 AM)OffGridInTheCity Wrote:
(11-04-2019, 09:54 PM)Cancri Wrote: I have a large mcc cabinet from work that will house my power wall cabinet its a little over 6ft tall and 4ft wide. Will be anchored to the concrete floor of my garage. With four locking doors two on each side, one door has a thick acrylic window that runs most of the doors length. The other side has a 15 in flat screen monitor. Can i output the batrium screen to that monitor you think?
The shelves in my picture are exactly 48" and have 14s worth of packs per row - so you should be able to fit a 14s 'battery' per shelf in your cabinet.

>15 in flat screen monitor.
The standard batrium 'piano-key' screen is a windows application - so sure as long as the monitor is hooked to a windows machine.  Otherwise, you'll need to go deeper with your own app that reads Batrium info.
Here's the standard Batrium screen from my own system:

many thanks. the bank in your avatar picture. is that a 40kwh bank? btw. thanks for the info on the batrium screen. sounds like a little itx board with some integrated graphics might be in order as well.

(11-05-2019, 01:51 AM)Crimp Daddy Wrote: Depending on your battery supply chain… have you considered using any other sort of large format battery?

If you are opting to do it for as little money as possible processing reclaimed cells is great, and the process is well documented, but many have also went the route of buying other types of batteries (EV modules, LiFePO4 prismatic, or similar)

Just something to consider before committing to a direction.  While I enjoy using 18650 cells for portables and smaller projects, it’s a significant undertaking to source, process, QC, and fabricate batteries using 18650 cells.  I would weight this against the cost of cells and the cost to make them into packs.  You might be surprised at the cost per kWh comparison.
when it comes down to time put into the project I am more than happy to spend that instead of money. If I am busy creating something then Im not getting into trouble or going stir crazy. I am one of those folks that if I have nothing to do I will find entertainment pretty quickly and thats not always a good thing.
if its already broke it is now an educational tool.... lets tear it apart now.
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#12
>@Cancri said "...the bank in your avatar picture. is that a 40kwh bank? btw."
Yes, I use 260ah * 52v = 13.5kwh per row of 14s120p. 3 * 13.5 ~ 40kwh. I'm currently adding 2 more rows for another 26kwh to take me to 66kwh battery bank. This is because I'm adding 21 more panels + 2nd inverter to power my home AC.


>@Cancri said "...thanks for the info on the batrium screen. sounds like a little itx board with some integrated graphics might be in order as well."
For direct access to Batrium info - start with this recent thread https://secondlifestorage.com/showthread...ht=Batrium for some ideas.
@Daromer has a GitHub with working WatchmonUDPlistener to access Batrium info - complete with UDP specs etc. (my hat is off to his sw development skills)
@Daromer is also youtube "DIY Tech & Repairs" channel and has some older youtubes PLUS it looks like he's starting a new series, see https://youtu.be/9bLRNofI4dk on Rasberry PI, hopefully following up with latest access to Batrium.

I just bought my Pi and I may try to follow along / get it working Smile
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#13
wait....you have a 40kwh bank and you cannot run your home AC on it?  are there days where you are topping 60kwhs?
what is the SEAR rating on your unit? how many "tons" is it

Humble beginning.
if its already broke it is now an educational tool.... lets tear it apart now.
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#14
(11-05-2019, 06:39 AM)Cancri Wrote:
(11-05-2019, 01:51 AM)Crimp Daddy Wrote: Depending on your battery supply chain… have you considered using any other sort of large format battery?

If you are opting to do it for as little money as possible processing reclaimed cells is great, and the process is well documented, but many have also went the route of buying other types of batteries (EV modules, LiFePO4 prismatic, or similar)

Just something to consider before committing to a direction.  While I enjoy using 18650 cells for portables and smaller projects, it’s a significant undertaking to source, process, QC, and fabricate batteries using 18650 cells.  I would weight this against the cost of cells and the cost to make them into packs.  You might be surprised at the cost per kWh comparison.
when it comes down to time put into the project I am more than happy to spend that instead of money. If I am busy creating something then Im not getting into trouble or going stir crazy. I am one of those folks that if I have nothing to do I will find entertainment pretty quickly and thats not always a good thing.

You may have missed the point I am trying to make…
 
I paid LESS money for my EV cells, than I would have for salvaged 18650 batteries and the materials required to build them into packs. 
You are also more likely to have problems or spend additional money in fix long term using very close to end of life cells.
 
I understand keeping busy if good, but not at the cost of the end result.  You live in the US, getting a EV pack is pretty easy.  All I am saying is to REALLY consider your battery options before really jumping into the deep end.
 
Just as an example…
I got 33 kWh of capacity in one trip. 
All the cells are testing at or near full capacity.
They are all consistent and healthy from my charge/discharge test.
The overall quality, consistency, and performance far exceeds anything I could have did with laptop cells and for less money. 
I was so impressed with the end result that I could not imagine doing a large scale powerwall any other way.
 
Note: I still source and process laptop packs and 18650 cells for fun, so I know what goes into both.  At the bare minimum, just try not to overpay for laptop packs because I see people spending way too much. Medical packs on the other hand are generally in much better condition.  Just be picky about your cells.
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#15
(11-05-2019, 04:46 PM)Crimp Daddy Wrote:
(11-05-2019, 06:39 AM)Cancri Wrote:
(11-05-2019, 01:51 AM)Crimp Daddy Wrote: Depending on your battery supply chain… have you considered using any other sort of large format battery?

If you are opting to do it for as little money as possible processing reclaimed cells is great, and the process is well documented, but many have also went the route of buying other types of batteries (EV modules, LiFePO4 prismatic, or similar)

Just something to consider before committing to a direction.  While I enjoy using 18650 cells for portables and smaller projects, it’s a significant undertaking to source, process, QC, and fabricate batteries using 18650 cells.  I would weight this against the cost of cells and the cost to make them into packs.  You might be surprised at the cost per kWh comparison.
when it comes down to time put into the project I am more than happy to spend that instead of money. If I am busy creating something then Im not getting into trouble or going stir crazy. I am one of those folks that if I have nothing to do I will find entertainment pretty quickly and thats not always a good thing.

You may have missed the point I am trying to make…
 
I paid LESS money for my EV cells, than I would have for salvaged 18650 batteries and the materials required to build them into packs. 
You are also more likely to have problems or spend additional money in fix long term using very close to end of life cells.
 
I understand keeping busy if good, but not at the cost of the end result.  You live in the US, getting a EV pack is pretty easy.  All I am saying is to REALLY consider your battery options before really jumping into the deep end.
 
Just as an example…
I got 33 kWh of capacity in one trip. 
All the cells are testing at or near full capacity.
They are all consistent and healthy from my charge/discharge test.
The overall quality, consistency, and performance far exceeds anything I could have did with laptop cells and for less money. 
I was so impressed with the end result that I could not imagine doing a large scale powerwall any other way.
 
Note: I still source and process laptop packs and 18650 cells for fun, so I know what goes into both.  At the bare minimum, just try not to overpay for laptop packs because I see people spending way too much. Medical packs on the other hand are generally in much better condition.  Just be picky about your cells.





I completely misunderstood your post, I thought you were telling me time vs money. as in ev packs would be more expensive but easier and faster. my bad. off to search the web for ev packs and such. research time. i had not considered this option as I thought pre built packs would be exorbitant in price.
if its already broke it is now an educational tool.... lets tear it apart now.
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#16
(11-05-2019, 04:02 PM)Cancri Wrote: wait....you have a 40kwh bank and you cannot run your home AC on it?  are there days where you are topping 60kwhs?
what is the SEAR rating on your unit? how many "tons" is it

Humble beginning.

My current system of 24panels (7kw PV array) tops out at 45kwh/day in summer from which I get 1150kwh in Jul and Aug (after inverter losses) and this powers the main house (lights, kitchen/cooktop, refrigerators, hot water heater, computers, workshop/tools, etc)

The 22yr old AC compressor burns a 1000kwh / month  in Jul and Aug - so I need additional power to accommodate.   It draws up to 23a@240v.   I have room for 21 more panels (6kw) and will need another inverter to handle this additional load.   The plan is to replace it with a whole house heat pump soon and be able to cool the house from solar but also heat the house (at least a few hrs a day) as well.    Its 2,700sq ft so 6-7 Ton range.

The primary reason for such a large battery besides supporting 2,000kwh/month is to attempt longevity thru very low DOD.  I'm hoping to get DOD below 30% on average and that the battery bank will actually last 1,000(s) of daily cycles at such a low DOD.    We'll see over time....
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