Hello Everyone,
Since December 2020, I have installed a backup system to help me to overcome the electricity problems in my offices, and since the commissioning all the system was working properly.the system is composed of 12 gel batteries 12V-210Ah C20 brand Leoch, a Color control and a Multiplus II 48V-5000/70.The installation powers only a few laptops, a few lamps and a small printer, so that our power consumption never exceeds 1200W.
Everything was working well and we had more than 8 hours of autonomy without the SOC of the batteries even reaching 70%, however for the last 4 days, in case of a power cut, after 5 minutes the low battery alarm sounds and the multiplus turns off.
Checking each battery individually in a chain of batteries in series forming a group of 48V, I noticed that the difference in voltage between batteries was enormous, one has a voltage of 9.87V, while the others are at 11.35, the other at 12.35V, this difference in voltage surprises me enormously and I wonder what could be the cause of this because everything was working properly, the settings of the charger well configured in VE configures for a Gel battery, and the room well air-conditioned to optimize the life of the batteries.
What makes it even more complicated is that the Color control mentions an SOC of 98%, but the voltage drops rapidly and the MultiplusII shuts down, followed by a High DC ripple message.
Can you please help me?
Thank you in advance to @Guy Stewart (Victron Community Manager), @Alexandra @Thierry Cortassa (Victron Energy Staff) ,thank you also in advance to anyone who can help me find a solution to this problem, because it's already been three days that I am forced to turn to the generator and the fuel costs are starting to weigh on my business, the pictures of the system are here if that can help.
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