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Old 01-16-2021, 10:14 PM   #1
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2015 Interstate Ext. Coach
Santa Barbara , CA
Join Date: Nov 2020
Posts: 6
Solar I op questions

Does anyone here have enough understanding and repair info to help me diagnose my 2015 interstate solar system?
I have posted two long posts, neither showed up... maybe too long or intricate?
I have details of the problem and what I have done so far,,
I would be happy to PM or phone to discuss. Thanks!
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Old 01-17-2021, 04:55 PM   #2
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Fulton , Maryland
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Can't help much if we don't know what problem you are trying to solve. You got the post above to show so add some details. The PM system does not allow attachments so better to discuss here and get a wider variety of experience.
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Old 01-17-2021, 06:41 PM   #3
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2015 Interstate Ext. Coach
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Thanks Boxter (Mike).
I posted two fairly long detailed posts, neither of which showed up, and none had attachments.
I had open voltage and amperage at the solar panels, but the display inside showed battery voltage (constantly dropping) as was the charge percentage. .1 amps showing , but the solar "time" was going up.
Today I pulled the bottom lounge cushion so I could get at the controller and do some checking in there.
I found I was getting voltage and amps to the yellow wire from the panels to the controller, but not coming out to the battery. First thought was a bad controller, but then I realized the voltage showed at a -20 volts. WHAT?
I pulled the bath fan to get eyes on the wiring, up there the wires were red and black coming out of the "firewall" plug (Not the yellow and green they should be).
Finally figured out whoever wired that in, wired it backwards (Red was Negative , Black was Positive).
Swapped them at the panels, all is well and working now. Go figure!!
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Old 01-17-2021, 09:29 PM   #4
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Quote:
Originally Posted by calmal View Post
. . . I pulled the bath fan to get eyes on the wiring, up there the wires were red and black coming out of the "firewall" plug (Not the yellow and green they should be).
Finally figured out whoever wired that in, wired it backwards (Red was Negative , Black was Positive).
Swapped them at the panels, all is well and working now. Go figure!!
Great - glad you solved the problem. I assume you bought your 2015 as a used unit. Might have been previous owner who messed up the wiring.

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