Batteries discharging too quickly..?

[Tiagoo]

Hi all. We have two lead acid cheap fleabay batteries. 130amp each.
Our panels are 700w total but with the rain and panels flat, we’re only producing between 100 and 250w a day.
Not having any other form of energy to charge the batteries they inevitably ended up being discharged quite a few times.

I just wanted you guys to confirm (or not) if these batteries are now busted. I’m attaching the voltage trends and basically when the voltage drops from roughly 12 to roughly 10v, nothing has been plugged in. It’s always only lights around 7pm and then phones at the very end of the night. But the surge between 12v and 10v is not being caused by extra load on our side. I.e. we’re not using more power when that voltage drop happens.

Also, would this be covered by the batterie’s warranty?

Thank you!!

 

[Rocketman]

Do you have a Victron shunt on your system- Smartshunt or BMV712? Probably not.

There are things in our RV’s that are always on - smoke detectors, etc. sometimes that base load can be a lot larger than expected.

If you have a shunt based battery monitor- you could see your base load - in addition to the voltage.

RV batteries don’t die - they are murdered… I think that is what has happened to yours.

A couple of things to check: are your batteries low on water? Are the cells sealed or can you add distilled water?

You probably need to get more watts into the batteries. Maybe get a small generator you can run when solar is bad. With lead acid batteries you should get them fully charged- probably every other day.

 

[hwy17]

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