Thanks! Might be too fancy for my use I do have a Giandel inverter but I'm mainly intending on using the batteries to add capacity to my portable power stations in grid outages. So I should be charging very infrequently. And I'd like to charge quickly from a generator at that time.Victron also has a very nice programmable small-amp charger. This one is a smart 7A. They have various amp-sizes.
I'm fine with the battery charging to 13.8 but I don't like that the AC charger keeps shutting off and then turns back on to try and charge. I need to buy a few more and put in series for 24v but I'm not confident in this battery right now.Well seems to me that would be close enough. The capacity and spec go to 14.6 but the BMS will shut off early to save some capacity left in the battery.
He didn't seem familiar with this issue when I contact him. Did he refund you?I can confirm that the 13.8 cutoff is due to poor pack balance. I added an active balance board and after properly balancing the pack the bms wouldn't cut out until 14.4-14.6. I've torture tested @12v and around 85a on a single battery and they passed with flying colors, however on a 48v system I cannot do even 1 full cycle with a 4s 2p pack at 100a w/o blowing the fet traces right off the board. I contacted Jim Gee and we reached an equitable settlement, but I would not recommend these batteries for use on anything but 12v systems.
What balancer did you add?I can confirm that the 13.8 cutoff is due to poor pack balance. I added an active balance board and after properly balancing the pack the bms wouldn't cut out until 14.4-14.6. I've torture tested @12v and around 85a on a single battery and they passed with flying colors, however on a 48v system I cannot do even 1 full cycle with a 4s 2p pack at 100a w/o blowing the fet traces right off the board. I contacted Jim Gee and we reached an equitable settlement, but I would not recommend these batteries for use on anything but 12v systems.
he offered a full refund if I returned the pallet, or a partial refund if I fixed the issues myself and shared my discoveries with him. I chose partial.He didn't seem familiar with this issue when I contact him. Did he refund you?
I can confirm that the 13.8 cutoff is due to poor pack balance. I added an active balance board and after properly balancing the pack the bms wouldn't cut out until 14.4-14.6. I've torture tested @12v and around 85a on a single battery and they passed with flying colors, however on a 48v system I cannot do even 1 full cycle with a 4s 2p pack at 100a w/o blowing the fet traces right off the board. I contacted Jim Gee and we reached an equitable settlement, but I would not recommend these batteries for use on anything but 12v systems.
May I ask what voltage system do you use them for and what percentage of total capacity do you discharge/charge regularly?https://www.amazon.com/gp/product/B09KVHZFJ5 I bought them out after I saw they worked, so who knows when they'll get more. you can find then on ebay direct from china, but this was the only us source I found. they worked great 7 out of 8 times one was less than functional.
Thanks for sharing your experience!
I have a feeling that to smoothly run a 48v system up to 100amp discharge and full cycle will require all battery cells and modules fully consistent and synchronized.
This mean all 16 cells have same capacity, connected with same wire length and same minimum Omhs drop in between, etc. This could be hard to archived using multiple pre-made 12v batteries.
But the price point is so good that I’m still tempted to buy 4 and merge to my existing BH 16 cells 48v system.
I was testing these for use in multiple systems. I bought a pallet of 30 batteries. I ended up completely replacing the individual bms's on 8 batteries with 1 external bms for a 48v system. If I was to start over, I would not purchase these. for a 48v system I would probably just get a server rack battery from signature solar only $300 more a better warantee and a proven track record. If I was chasing lower cost I would get 2 of signatures 24v 100ah packs and an external bms, still less labor than trying to make these work and a better price. 2x@499 and 100-150 for an external bms. I ended up using these because I had a client that needed his system up and running asap and I didn't have the time to deal with returning these and reordering from someone else.(he was spending $600 a month on propane for generators)_ As I have already posted, with an active balancer these performed fine @ 12v, but I would not trust them @24v or 48v, as I experienced multiple failures on 24 & 48v systems. the seller was accommodating vis a vis warantee, but the amount of time I lost making these work is not something I would choose to do again. I will soon be making a 4 battery pack install with 120a 4s jbd bms's installed into the individual batteries to see if a bms change will allow these to function to spec.May I ask what voltage system do you use them for and what percentage of total capacity do you discharge/charge regularly?
I just purchased a 3rd battery on 5 March for $298 and received it today. Just checked the listing and the price went up to $320.FWIW I'm considering these for our Airstream trailer. On Ebay (https://www.ebay.com/str/goiptvllc?_trksid=p2047675.m3561.l2563) there is the $350 price category and there is a Marine battery at $320. I asked GP what the difference was and the owner responded promptly and said there was no difference only that Ebay charges more for the non-Marine category.
@jwasilko mentioned a $298 price, I'm curious where that came from?
Maybe it "has a low temp shutoff"? (Saw that on Ebay listed for 320USD).I'm curious, why the interest in this battery when it's actually more than one of the Chins/Ampere Time batteries that have already been proven?