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Old 09-02-2013, 11:05 PM   #1
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Solar output concern

I've just installed a 480watt solar system on my rv and I an concerned about the output. The panels are rated at 22.3 volts open circuit output and 18 volts operating voltage. My meter registers 19.28 volts at the end of the feed wire where it enters the controller which is 2 feet from the batteries. Is this good or am I getting too much voltage drop? I ran 10 gauge wire on the roof to a rooftop combiner box, then 12ft of 8 gauge from box to inverter bay where controller was installed. Then 6 gauge welding wire to batteries.

Is this all good? The controller is a Trimetric PWM65.
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Old 09-02-2013, 11:14 PM   #2
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You would have to take readings at your panels then at the end of the feed wire to measure voltage drop. I would bet it's less than one with the size wires your using.
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Old 09-02-2013, 11:21 PM   #3
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You can't just go by the panels specifications. To determine the voltage drop one needs to check the voltage at the combiner box compared to the voltage at the input of the controller. That said I would have used at least #6 from the combiner box to the controller, and preferably #4 from the combiner box all the way to the batteries. In bulk mode the full current from the panels is passed through to the battery bank.

Attached is a description of my somewhat similar system.
Attached Files
File Type: pdf VSheetz - Solar Setup for my RV v1.0.pdf (441.7 KB, 23 views)
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Old 09-02-2013, 11:24 PM   #4
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Wiring examples from AMSOLAR, an experienced RV specialist.

AM Solar's Support Pages System Wiring Overviews
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Old 09-02-2013, 11:36 PM   #5
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Does it charge the batteries OK?
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