If I’m reading the description right, they are selling 12kWH for 2425.00 delivered to the lower 48 states...
Jehu posted these from EVWest. seems too good to be true.
- Thread starter Supervstech
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If I’m reading the description right, they are selling 12kWH for 2425.00 delivered to the lower 48 states...
Jehu’s video shows the modules have a voltage monitoring board built in, hat has a proprietary interface, but each bank has the BMS wiring ready to plug into an RC charger.
SolarRat
Solar Addict
Seems like they test at about 80% original capacity. I wonder if battery degradation is linear over time or does it degrade faster the older it gets? ie, if it took 7 years for it to lose the first 20%, will it only lose another 20% over the next 7 years or will it more likely lose ~40-50%? Anyone know?
Stingy49
Solar Tinkerer
Looks to be relatively linear. This is from the pdf datasheet on EV West's site.
Edit: I just noticed that's at 100% DOD also.
Edit: I just noticed that's at 100% DOD also.
motorzen
New Member
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Pricing has gone down on these a bit. $1720 for four (plus $425 shipping - local pickup is available).
I'm curious about using this with a 5kw/48v MPP Solar All-in-One ... since Jehu describes it is a 48v battery pack, where EVWest says 60v.
Are these compatible? -- It looks like this 5048LV does bulk charging of flooded at 58.4vdc with 60vdc max.
I'm curious about using this with a 5kw/48v MPP Solar All-in-One ... since Jehu describes it is a 48v battery pack, where EVWest says 60v.
Are these compatible? -- It looks like this 5048LV does bulk charging of flooded at 58.4vdc with 60vdc max.
erik.calco
Solar Badger
The PDF he links to has two model numbers, but the specs don't match what is on the EVWest description. The image on EVWest, if you zoom in, matches the specs on their site:
I couldn't find crap online for this model, and I bet they coudn't either.
Given that the site specs look correct, comparing to MPP Solar, problems are:
- MPP Low DC cuttoff range 42-48V, but low 49.8V is min on Samsung.
- MPP float max is 58.4V, but that is nominal on Samsung, with top of range at 65.2.
You'd always be 0-50% on the battery and have to rely on the low-voltage cuttoff from the BMS instead of MPP. Not sure how MPP would detect and recover from that. And not clear what capacity you would have with this range. Would need a discharge chart to estimate.
In other words, looks like the battery is at a little bit too high of a voltage for MPP.
Another downside is they used Li-Ion instead of LiFePO4. Offsetting that is the likelihood that it has one of the best BMS. But I prefer LiFePO4.
I emailed EVWest and will wait for a reply.
However, this could lead to unbalanced draw... I would cut the main negative bar, and route it to the opposite main neg... and pull equally from both banks.
"These cells are used, and some cells do show signs of minor swelling, but still pass capacity under our own testing. "
No one cares these have signs of swelling? Im not going to risk $1500 on cells taken out of action because of defects.
No one cares these have signs of swelling? Im not going to risk $1500 on cells taken out of action because of defects.
batteryclearinghouse
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It'a important to understand how corporations see capital investment/deprecation... most of the time when commercial rack mounted battery units are being repurposed it has zero to do with functionally/defects.
It's like buying a used 53' long semi truck trailer... the best year to buy a used trailer is between years 3 and 5. The usefull life of one of those 53' trailers is like 15 years. The corperate tax rules create a scenario where it's more advantages to sell a trailer and buy a new one every 3-5 years. It also avoids some maintenance costs.
A used commerical battery unit... 99 times out of 100 will win hands down compared to similar "new" cheap asian import battery.
If your wanting a large DIY power bank... the commerical rack units I have seen out there will give you a huge bang for the buck. Most of the time, they are just getting swapped out with newer units once the finance guys have depreciated their capital costs.
Odds are that the samsung units are perfectly fine and folks will end up with a really well built unit that will last for years.
It's like buying a used 53' long semi truck trailer... the best year to buy a used trailer is between years 3 and 5. The usefull life of one of those 53' trailers is like 15 years. The corperate tax rules create a scenario where it's more advantages to sell a trailer and buy a new one every 3-5 years. It also avoids some maintenance costs.
A used commerical battery unit... 99 times out of 100 will win hands down compared to similar "new" cheap asian import battery.
If your wanting a large DIY power bank... the commerical rack units I have seen out there will give you a huge bang for the buck. Most of the time, they are just getting swapped out with newer units once the finance guys have depreciated their capital costs.
Odds are that the samsung units are perfectly fine and folks will end up with a really well built unit that will last for years.
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