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Old 25-03-2017, 18:12   #1
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HELP!

I just installed (2) 160 W solar panel's and a Victron controller. The panels are able to bring the batteries up to a 100% charge by the end of the day, but, according to the Victon monitor, the batteries aren't able to hold a charge over night.
The question is: is the monitor set wrong and misreading information? Or, is it time to replace my batteries? Or, do I need a bigger battery bank with more amps to get me through the night?

I have (2) 210 amp AGM batteries. Both 5yrs old
Test info prior to adding solar panels:
Battery # standing voltage time

Battery 1 12.55 10.10 am
Battery 2 12.52 10:12 am

Standing voltage test repeated

Battery # standing voltage time

Battery 1 12.55 10.50 am
Battery 2 12.52 10:51 am

Discharged change recommended

200 AMP load test

Battery # capacity

Battery 1 -55%
Battery 2 -55%

Total combined capacity 210 AH

Conclusion

Batteries are still stable, replacement isnít immediately recommended. However, the charging system / mode of charge, charging frequency needs to be looked at, since the batteries are not taken up fully through the full charging cycle (bulk, absorption, float). Also the age of the batteries together with the limited storage can all contribute to the current problem experience.

Here's what the Victron mppt monitor is reading:
7:30 pm. Batteries at 98% 12.72v.
4:45 am. Batteries at 89.7%. 11.97v. And victron alarm goes off.
The only two things on at night is the anchor light (.5) and the fridge (approx. 7.0 amps).
Any thoughts/suggestions are welcomed and appreciated😊👍
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Old 25-03-2017, 19:11   #2
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Re: HELP!

If you are dropping tto 11.97V over 9 hours, either you are using about 150Ah over night (average 16+ Amp draw?) Or your batteries are stuffed.

Your battery capacity test indicates it is the latter
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Old 25-03-2017, 19:47   #3
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Re: HELP!

Five years, not a bad run, time for a new bank
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Old 25-03-2017, 20:08   #4
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Re: HELP!

"Ask and you shall receive"
Just as I had suspected...
Thank you both for the conformations😊👍
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