Solar questions

4 are plenty for the panels, but for the fiberglass roof I would use at least 6.
I second on cutting your own angle iron aluminum brackets if this is possible for you. I did this and then just use self-tapping screws into the sides of the panels where it is safe to do so through the frame and not hit any critical parts.

Are you using VHB tape to the roof or mounting with hardware through the roof? Fiberglass roof can be a solid roof or can be rolled-out sheets that are more flimsy, so just curious.

You can use wire that is thinner than the electrical optimum gauge of course and it will work just fine. The differences will be only noticed when you need maximum charge and every last solar particle you can catch..

I would just get a higher amp controller so you can run in series and use the thinner wire. Is this an option? Did you keep the receipt for the controller? In the long-run you will be glad you did.

Teleman wrote:
I'm mounting three 210 watt Newpowa panels on my 30'Class A motorhome. I'm using Renogy Z brackets to mount them to my fiberglass roof. The panels are pre drilled to accept 8 of these brackets. Do you recommend 4 or 8 brackets per panel? Also I'm using the MPPT controller in my Redarc 40A DC to DC charger which has an input voltage of 9-32V. I need to run the panels in parallel to keep the voltage low enough but that means I need to use 6ga wire to run from the point of parallel conection. Do they make connectors that will fit 6ga wire? Or do I need to splice the cables? Thanks in advance.

I used 6 brackets on my 325 watt panels which are a little bigger. so I think 6 and you will be good.

Steve

The use of Z brackets make the panels hard to remove. Cut 2 pieces of aluminum angle and bolt together as a Z but easy to remove.

I recommend eight brackets for panels that big.

Maybe a slight adjustment in your equipment would work better?
3 Newpowa 210 watt 24 volt panels with a controller that will handle at least 35 volts input. That gives you 18.75 amps for 10 gauge cable.

Richard