Gather Materials and Tools
Start with the Harbor Freight solar kit (panels, mounting brackets, charge controller, wiring, connectors) and ensure you have a compatible RV battery bank, a drill, wrenches, a multimeter, and safety gear.
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Mount the Panels on the Roof
Locate a flat, unobstructed area on the RV roof. Mark bracket locations, drill pilot holes through the roof seal, and install the brackets using stainless‑steel bolts. Secure each panel to its bracket, tightening bolts to the manufacturer's torque specifications.
Wire the Panels to the Charge Controller
Run solar cable from each panel to a central junction box, using MC4 connectors to maintain a weather‑tight seal. From the junction box, route the positive and negative leads to the charge controller, observing correct polarity. Fuse the positive line near the controller according to the panel's amperage rating.
Connect the Charge Controller to the Battery Bank
Locate the controller's battery terminals, typically labeled "Battery +" and "Battery –". Attach the controller's output leads to the RV's house battery bank, again observing polarity and using appropriate gauge wire. If the controller offers a load output, you can also connect it to the RV's DC distribution panel.
Test and Secure the System
Turn on the charge controller and use a multimeter to verify voltage at the battery terminals. Check that the controller displays correct panel input voltage and charging current. Once confirmed, seal all cable entries with silicone sealant and route excess wiring neatly along existing conduit.
Optional: Add a Monitoring Display
Many Harbor Freight controllers support an optional LCD or Bluetooth monitor. Install the display in a convenient interior location and pair it with the controller to track real‑time solar production and battery status.