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Old 03-22-2013, 12:36 PM   #15
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Was just trying to help Jeff. Good luck with your issue.
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Old 03-22-2013, 02:16 PM   #16
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Originally Posted by SlyFox View Post
Was just trying to help Jeff. Good luck with your issue.
And thank you sir. Appreciate the input.
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Old 03-25-2013, 03:10 PM   #17
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I have 220 AH of battery capacity and two 100 Watt panels that each produce a little over 5 amps with full sun. Usually the battery discharge by morning is between 5-8% and it takes less than 2 hours to bring the batteries back to 100%.

With several consecutive days of rain and very heavy loading I was able to draw the batteries down by more than 20% and with one day of sunlight I was able to fully recharge the batteries in 5 hours time.

For your setup 10 amps in total should be all you need. If not then you may have a problem with one of your batteries or your charge controller or a panel. Most likely culprit is one of the batteries as with two 6-volt batteries a single bad cell in one will create resistance for both batteries. My first step would be to add water to all the batteries, charge them with a regular battery charger and then have them load tested.

If the batteries check out then I would use a VOM with an amp metering capability to verify the amps from the panels to the controller. If that was OK I would discharge the batteries 25% and then verify the recharge voltage and amp level from the charge controller.

If that all checks out then I would suspect a volt vampire and look for an electrical appliance that is running hot or a faulty switch or similar problem that has increased the demand on the batteries. It does not take much in demand (Watts) over a 24 hour period to drain the house batteries.
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Old 03-25-2013, 04:45 PM   #18
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Usually the battery discharge by morning is between 5-8% and it takes less than 2 hours to bring the batteries back to 100%.
If you don't mind my asking, how do you know this?

With my current system I figure I'm fully charged when I hit float and there's less than an amp going to the batteries. 5.06 - 4.26 = 0.8. Watts of charge power being produced minus loads equals charge power to batteries.


How are you measuring your system?

- Jeff
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