Measuring amps from solar

Submitted: Tuesday, Apr 16, 2013 at 16:19
ThreadID: 101734 Views:2874 Replies:10 FollowUps:9
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I couldn't find an answer to my question, but I'm sure it's been asked.
I'm wanting to measure Amps to understand why my battery isn't holding charge.
The panel is 80 watt, and is outputting around 20Volts, Voc.
When I connect my multi meter in the circuit, I can't get a reading. I use the 10Amp jack and connect in series.

I connect between the +ve lead from the panel and the +ve terminal on the controller. I get zero Amps. I've confirmed that the MM works OK by connecting it in series with a mains battery charger and I read the charge current.

I'm wondering if the battery voltage impacts the reading. Cancels it out?? But shouldn't the electronics in the controller manage that?

I also note that when the panel is charging, the voltage accross the battery terminals is only about 12.5 volts. I understand that normally you need about 14 volts to charge a battery. Is solar different?

I've swapped the controller from another installation, but no change.

Can some of you solar experts enlighten me please.

Thanks,
John
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