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Old 07-06-2023, 04:04 PM   #1
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Brand: Thor Motor Coach
State: Florida
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THOR #28289
another 190 watt panel on the roof of the 2023 tellaro 20k

I'm new in all this but I want to share what I did, maybe someone want to do the same to get more power during the day.
first, I replaced the 10 amp go power mppt charge controller for a go power 30-amp mppt .
after that I removed both rack in the roof to the front of the van, after that was really easy to install both panel.
I'm sorry for my English I'm trying to improve really hard every day.
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Old 07-06-2023, 04:28 PM   #2
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Model: 2018 24.1 AXISSIXxSIX
State: Arizona
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THOR #13932
Excellent post and pictures!

You'll be a welcomed and valuable member here.

Thanks.
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Below is a link to most of my modifications either accomplished or pending.
https://www.thorforums.com/forums/f2...n-18996-3.html

Click on my pictures then click the pop-up for a full screen zoomable picture.
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Old 07-06-2023, 07:08 PM   #3
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Thanks, more pictures.

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Old 07-06-2023, 07:09 PM   #4
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If you haven’t already done so, wire your two panels in series(+ to - to + to -) rather than in parallel. That will double the voltage but also drop the current in half which will significantly reduce the voltage drop in the wire to the controller.

Your MPPT controller will convert the higher input voltage down to what your battery needs. Don’t do this with a PWM controller though.

David
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Old 07-06-2023, 10:56 PM   #5
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Model: Chateau 24F
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Very nice and informative post... and GREAT pics!

David makes a great point about wiring your panels in series. In parallel you're approaching the maximum safe amps for 10AWG solar cable. Make sure they're in series.

Note if you add panels beyond this, you'll need to go to a higher amperage charge controller. Otherwise your 30amp controller will just dump the extra and you'll see no benefit.
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Old 07-07-2023, 11:38 PM   #6
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Nice...

To pile on...in series, you can shade a panel and still bring in power
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Old 07-08-2023, 12:49 AM   #7
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Quote:
Originally Posted by RonRM View Post
Nice...

To pile on...in series, you can shade a panel and still bring in power
I think it's the other way around... shading one panel in a parallel circuit doesn't affect the others, but in series shading any panel affects the entire series.

Either way, shade and solar panels aren't a good mix. Series is always recommended until you get into larger setups where you generally start mixing series/parallel. But that's another thread for another day.
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Old 07-08-2023, 07:16 PM   #8
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Im an idiot...you are right parallel mitigates shading...i typed but didnt think about what i typed apparently
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