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Battery Problem ?

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Posted by Bob on January 6, 2007, 1:50 am
My solar set up is as such: Twelve 80 watt solar panels arranged in 24
vdc configuration. Ten 100 amp deep cycle batteries arranged in
series-parallel 24 vdc. 24 vdc feed to combiner and 45 amp battery
controller. 24 vdc fed to pure sine wave inverter with 230 vac 50 cycle
output. Recently battery controller has been indicating low battery
voltage in the mornings and the inverter shuts down the low powered
cctv security system. If this indicates a battery problem then how is
the defective battery found?


Posted by George Ghio on January 6, 2007, 3:26 am
Bob wrote:

First check that all connections are clean and tight.

If this does not solve the problem you may indeed have a bad cell.

Check all cell voltages, the one that reads low will be the problem.
This test is best done after charging and then letting the batteries
rest for several hours with no use or charging.


How old are the batteries?

What is the warranty period?

What sort of batteries are they?

Welcome to the joys of series/parallel batteries.

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Posted by Bob on January 6, 2007, 9:28 am
George Ghio wrote:

Reply: I did find some battery corosion under the cable of #2 battery
and cleaned off with a file. Nice and bright now.

connections tomorrow morning.

They are on charge now. Will check everything again tomorrow morning.

Ans. Less then a year old. Purchased all at the same time

Ans. I dunno. But guess about a year.

Flooded type batteries, deep cycle (Company called 3K - We're in

Ans. Thanks!!

I did take a voltage ready of each battery this morning prior to the
sun getting at the solar panels.

1 - 11.4, 2. 10.9, 3, 11.3, 4. 11.2, 5. 11.2, 6. 11.4, 7. 11.2, 8.
11.4, 9. 11.3. 10. 11.2
I removed #2 and replaced with another battery we use on our solar
street light project. The #2 is now on automatic battery charger since
this morning.


Posted by Solar Flare on January 9, 2007, 12:48 am
 You need to equalize them badly. This may cure your problem. Cook them
with a heavy charge for a few days.

Posted by daestrom on January 9, 2007, 1:00 am

Agreed.  If it's at all practical, separate out each string and charge the
strings individually.  THEN look to see what cells might be bad.


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