Alkaline
Solar Wizard
1500ah for 48v 100ah? Where cheapest I have seen is about 2000 with shipping / taxes. I'm in the market so any infos would be nice.
Question for DIY battery builders
- Thread starter GuyG
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1500ah for 48v 100ah? Where cheapest I have seen is about 2000 with shipping / taxes. I'm in the market so any infos would be nice.
timselectric
If I can do it, you can do it.
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Whenever I get time to work on it again. I'll start posting pictures again.
timselectric
If I can do it, you can do it.
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EG4 Lifepower4 server rack batteries.
EastTexCowboy
Solar Wizard
That’s $0.173/Wh.
Signature Solar’s most cost-effective OTS offering is $1450 for 5.1kWh or $0.284/Wh.
Or then there are these OTS offerings from Amazon: https://www.amazon.com/HQST-Phospha...cphy=9032080&hvtargid=pla-1711584843982&psc=1
$270 for 1.3kWh or $0.208/Wh.
The trend (and it’s continuation) is clear: DIY only makes sense of you are building a specialized battery not available OTS or because it is a hobby you do primarily for enjoyment rather than because of cost savings: https://diysolarforum.com/threads/future-of-diy-lifepo4-looks-bleak….32157/
EastTexCowboy
Solar Wizard
Which JK BMS do you use? The 200A?
Alkaline
Solar Wizard
$1700 + $325.00 shipping + taxes
EastTexCowboy
Solar Wizard
Buy six and get a free rack.
Yes, you'll have shipping and taxes but that's true just about any way you go.
Alkaline
Solar Wizard
Cool I'll start a go fund me then ? .. 1 batt is all I'll be able to get for a while.
timselectric
If I can do it, you can do it.
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$1,499 plus tax.
Shipping depends on your location.
timselectric
If I can do it, you can do it.
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Yup
B2A20S20P
US $45.30 30%OFF | JK BMS 1A 2A 5A Balance Current 8S 12S 13S 14S 16S 17S 20S 24S Smart JK Bms 60A 80A 100A 150A 200A 600A Lifepo4 Li-Ion Battery
wiseacre
Solar Addict
Something no one mentions is asking a vendor if they have "salvaged cells" from battery returns. Lots of batteries get returned because of a faulty BMS, maybe a bad cell or cosmetic blemishes that a buyer won't accept. Another opportunity is cells that have been sitting a long time not selling.
My first DIY project was a third, some 202ah cells that had scratches you could hardly notice but none the less made them "undesirable" to sell and maintain a vendor's reputation
($800) - $50 each for 16 cells with free shipping
($250) - (2) JBD 8s BSM @$125
($72) - 4 sets of "Y" connectors for the BMSs @$18
($1122) = (2) 24v, 200ah batteries (9600wh)
Second project was made from salvaged SOK 206ah cells
same cost as the above
Throw in the cost of the bench power supply (under $60)
Bus bars - Got a deal on some "unfinished/rough" bus bars ($30)
$2330 for 19,200wh
Of course there's no warrantee/guarantee but I found the cells to be good as new, actually capacity tested above stated ah
I won't mention the vendor, he asked me not to tell in order not to be overwhelmed with inquiries.
Bottom line, if you don't ask you'll never know what might be available
Disclaimer: I only asked one vendor and got lucky. Who knows what response I may have gotten from others
My first DIY project was a third, some 202ah cells that had scratches you could hardly notice but none the less made them "undesirable" to sell and maintain a vendor's reputation
($800) - $50 each for 16 cells with free shipping
($250) - (2) JBD 8s BSM @$125
($72) - 4 sets of "Y" connectors for the BMSs @$18
($1122) = (2) 24v, 200ah batteries (9600wh)
Second project was made from salvaged SOK 206ah cells
same cost as the above
Throw in the cost of the bench power supply (under $60)
Bus bars - Got a deal on some "unfinished/rough" bus bars ($30)
$2330 for 19,200wh
Of course there's no warrantee/guarantee but I found the cells to be good as new, actually capacity tested above stated ah
I won't mention the vendor, he asked me not to tell in order not to be overwhelmed with inquiries.
Bottom line, if you don't ask you'll never know what might be available
Disclaimer: I only asked one vendor and got lucky. Who knows what response I may have gotten from others
I have been "building" my system for about two years, give or take. Basically save up some $$$, make a purchase, repeat...
It would have been nice to have done it all at once, but life's realities kick in. You know food, gas, shelter, those pesky things that eat up the budget.
42OhmsPA
What's in a title?
Torque it 'till it breaks and back off 1/4 turn, perfect torque every time. ?
@GuyG if you're a DIY kinda guy, build your own. Great advice here already.
Shop around for cells with the best cost per Wh, it was 230ah for me.
Another big plus for me was learning and understanding how it works.... If a cell goes bad I can easily swap it out with a spare (yes, order 1 or 2 more than you need for your battery; who knows if you'll be able to get the same ones in a year or so...)
Zwy
Emperor Of Solar
Because it doesn't look pretty like this?
It will be a shame putting the doors on it and closing it up.
Anyway, as for cost. https://diysolarforum.com/threads/a...ut-ahead-going-full-offgrid.53943/post-701875
Now take the EG4-LL and use the same cycle count of 6000 cycles, and 5.12 Kwh and 90% capacity. Comes to $1700 plus shipping and tax comes to $2006.10 to my door.
5.12Kwh x .90= 4.6Kwh
$2006.10 divided by 4.6Kwh = $436.11 per Kwh
$436.11 divided by 6000 =$0.07268 per Kwh over the expected life cycle of the battery
My bank was $0.0264 per Kwh over the expected life cycle of the battery. The cost of the EG4-LL is 2.75 times the cost per Kwh for the DIY bank I have.
If you went to the one grocery store and they had 10lbs of sugar at 2.75 times the price of 10 lbs of sugar at another grocery store, which one would buy it from?
Edit: forgot the 30% tax credit on the EG4-LL, that would be $0.07268 x .30=$0.0218 so it is $0.05088 for the EG4. Not quite 200% over the cost of my DIY.
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42OhmsPA
What's in a title?
timselectric
If I can do it, you can do it.
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It depends on if you want to buy sugar. Or the ingredients to make sugar.
WindWizard
Solar Enthusiast
I just added another 64 LFP Cells to my system to make a total of 128 LFP Cells. They are 280 AH Cells. I purchased them from Docan Power. All the Cells were pristine in appearance and the voltages were all within 3.304-3.306 volts except for one cell which was low at 3.256 volts. The cost was $8736 for 64 Cells including shipping. I do not have the equipment to test the cells so I just put them all in service and then top balance them while they are in service with a charger and a light bulb.
It does take a bit of work to do the work yourself but I think it has some advantages as well.
1- If one cell needs to be replaced then it is easy to do.
2- If one cell needs to be charged or discharged to balance the pack it is easy to do
3- If the BMS fails it can be replaced free of charge (Overkill Solar)
4- It is cheaper than constructed packs
5- You learn a lot by doing it yourself
It does take a bit of work to do the work yourself but I think it has some advantages as well.
1- If one cell needs to be replaced then it is easy to do.
2- If one cell needs to be charged or discharged to balance the pack it is easy to do
3- If the BMS fails it can be replaced free of charge (Overkill Solar)
4- It is cheaper than constructed packs
5- You learn a lot by doing it yourself
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TorC
Solar Enthusiast
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I went DIY partially for cost, and to a significant degree because I could buy a few extra cells (went with four extra per 32 because I could make a 12V pack with whatever remained as long as one wasn't completely dead) and know that I could fix it. Shipping lithium batteries to where I am is very difficult, so repairable is high on my list of values. Even as it was, I had to arrange a freight forwarder to actually get my cells to me. Given logistics, if push comes to shove, I'd rather be able to scrap a cell, take a small loss there, and get my system back up.
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