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kohldad's avatar
kohldad
Explorer III
Aug 23, 2015

Solar Wiring

Now that I have the 100 Watt Solar on the way, figured it was time to sort out the wiring.

Hopefully, the schematic is clear enough to understand.

The wiring to the camper is at the rear bumper to make connecting very easy. Used a standard 7-pin plug but since I only have clearance lights, was able to use 3 pins for ground and 3 pins for positive. Battery is directly above the connector, so it actually minimizes the loss by having the heavy #2 wire run to within 5 feet of the battery. This is optimizes battery recharge, but not necessarily the best for powering heavy loads like the Fridge.

The numbers above each of the wires shows GAUGE/FEET of the run.

Do I need to add fuses or breakers any place I missed. Not shown, but the truck relays are fuse protected and controlled by ignition.

  • Technically the 10, 12, and 14 guage wires to the 7 pin are not properly protected. That risk can be minimized by making sure they are well protected mechanically by sheathing them very well. The short length helps in that regard.

    Otherwise it looks like a solid design to me.

    To AnEv942, the controller is protected by the breaker near the battery. Contrary to what some folks say, it doesn't need any protection on its output side from its own current output since it is current-limited, as are the solar panels. On a system this small, no protection is needed there if the wires are big enough to handle the current, as these are.
  • As too fuses, I dont see the protection for the controller? in from panel or on load side.
    Electrically as shown may, and admittedly I'm not the crispest cookie in the jar, but I would have run solar directly to batt before any possible loads?

    Still studying-for some reason the path is not clear. fridge/inverter go thru 2 breakers...
  • Used the same breaker for the fridge and inverter because both are never on at the same time.

    There are two relays in parallel, both rated at 40A. It was part of an aux switch package ordered with the truck.

    Didn't worry about fusing the separate wires because the run to the connector is only a few inches. Have thought about changing from the 7-pin to a Anderson SB175 for the power, but didn't like the idea of two connections. Will re-evaluate the fire risk.

    To the moderator - move if you wish. However, most times in the tech forum they start talking about 400+ watt systems, not the small demands of a TC. Plus, I know the folks on this board and trust their opinions more.
  • I would put your fridge and inverter on their own breakers.
    How big is the relay in the truck feeding the 2 gauge? Each of the 3 7 pin plug wires connected to the 2 gauge should have fuses for their amp rating say 15 amps. I would just leave the 7 pin alone and run the 2 or 4 gauge wire all the way back to the TC battery.
  • I think this thread should be in the Tech Issues Forum, and should be moved. If you believe this thread is unique to TCs, please advise.

    Wayne
    Moderator