Battery bank discharging extremely quickly following an "over discharge" event

[kcross888]

Looking for a way to determine if my battery bank is shot. I had an over-discharge event on my batteries a few weeks ago. Disconnected the inverter, powered everything down except the charge controller, panels, and battery bank. It took a week (middle of winter) but the battery bank did eventually recover and fully charge. I turned the inverter back on, plugged in the refrigerator (everything else is still disconnected), and within an hour it's down to like 25% or less.

For what its worth I don't like my battery display/info meter. MT50. I don't know how to get anything useful out of it.

 

[OffgridMatty]

What type if battery are you using? How are you determining the state of charge? It may be off for a bit as your BMS recalibrates.

 

[mikefitz]

over-discharge event on my batteries a few weeks ago

What battery make?

battery display/info meter. MT50.

Disregard battery SOC.

 

[740GLE]

MT50 isn’t known for adequate SOC monitoring, with such low production in winter im thinking you just need more time at high voltage to charge back up

*assuming you don’t have FLA and dropped voltage down to 10v or something.

 

[Steve_S]

How to ask a question:
Provide Make & Model of ALL your equipment.
Make/Model &/OR full description of battery packs if DIY...
Your Charging Profile information for Solar & inverter/Charger or AIO.
LINKS to any product in use is always valuable.

Then you MAY get an answer that is actually an answer.