Accidentally put this in the 'shop' reviews...
Sorry.
It belongs here, in the product review section.
I have eight of these batteries, some purchased in October 2024, and the rest in November of 2024. The battery bank is connected as two in series for 24 volts, and the four strings of those in parallel for 400 amp hour via individual breakers.
They have all performed FLAWLESSLY up until about a month ago, when I started having trouble with the Bluetooth app after it was updated.
Now, seven of the eight work fine, but I can't get any data from the one battery. It shows up in the scan lists, says it has connected, but no information comes up on the app. I decided to check its voltage thinking that if the bluetooth didn't work right, and I could still just run it in the bank as if it was a battery without bluetooth and I'd monitor it with a voltmeter or use the Victron shunt isolated auxiliary voltage input that is designed to monitor other batteries at the same time as it 'watches' the main battery bank.
Grabbed the voltmeter and the voltage was way off.
The bluetooth app still 'sees' the battery and says it's connected, but no data posts on the app.
I've isolated it and tried charging it with a bench power supply, (set to multiple voltages from 12.8 up to 14.6 volts,) and it won't take a charge, nor will it source any current to a load. A high impedance voltmeter (20 Meg Ohm) shows 5.5 volts, but when any load is placed across the battery, the voltage drops to zero. (I use a 120v 250w incandescent bulb with clip leads to 'pre-charge' the inverter input caps before closing the battery breakers to avoid damaging circuit breaker contacts with the high inrush current,) and I placed it across the battery terminals. The voltage drops to zero.
So, something has gone sideways with not only the bluetooth, but the BMS apparently has a problem as well.
I'm waiting for instructions from Wattcycle on how to proceed, but with that battery down, I've now lost 1/4th of my battery bank capacity.
