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Just signed up to agree here. I hate to trash a company in a niche industry attempting to disrupt. BigBattery has been unimpressive. I bought a 48V 5kW to test. I was ready to buy 4-6 more. Nothing but problems from day 1. Batteries are 'loose' in the metal case. BMS randomly shuts off well...

Using the same Growatt with 2.3K of panels. Initially I bought bigbattery 48V, nothing but problems. Then I bought CHINS 12V and put them in series for 48V, working great. Just bought 30kW of EG4 from Signature Solar to pair with another 4kW array and a Growatt...

My only concern with the Chins is what happens if there is a 'fire'. I'm building individual battery containers out of metal, or maybe cement board+metal. It's been 3 months for me and they are cycling great. I get 90% charge by 1-2 pm with non-optimal array that misses sun after 3PM.

Those $999 5.12kWh Server Rack Batteries are just samples and not actually available to purchase. They are intended for large commercial installations and they have them on the site "for show". Ask me how I know. :D https://liniotech.com/liniotech-residential-battery-cell-power-by-catl/#details

My 48V LAMA also had/having problems since delivery. Suppose it's a random roll of the dice with them. I can't get mine past 48V. Settles around 46V after a day. 46V / 14S = 3.28V

I wish I was having the same luck with their support.

They offered to sell the $999 batteries to me direct from China for $1799 including shipping.

I have a LAMA 48V from BigBattery. It has never worked as expected. I finally got it to charge to 50.4V (3.6V), it quickly bleeds down to 47.6V (3.4V). I asked BigBattery and they said they consider 3.4V 100% charge. Which seems to be the case with LFP in general? They had me reset the BMS...

After reading your post again. The voltage jumping around happened to my 48V LAMA after the first BMS shutdown and BB told me to charge with 48V external charger the first time it kicked off after about 1.5kW of use. The voltage read 44.5 on the battery side of the BMS, and 4.5V on the plug...

Oh .... my 48V LAMA goes dead/unresponsive without a jump below about 45V. Have you tried taking it to 3.1V * 14 ( 43.4V )? Mine will not.