Can I install solar panels on an RV myself?

Yes — rooftop solar is one of the most DIY-friendly van upgrades. The panel mounting and roof penetration require care (sealing is critical to prevent leaks), but the electrical work is 12V low-voltage and doesn't require an electrician. Budget 4–8 hours for a first install of 2–4 panels.

How do I run solar cables through an RV roof without leaks?

Use a dedicated cable entry gland (Hehr or Victron entry plate) sealed with Dicor self-leveling lap sealant on the outside. Drill the hole slightly smaller than the gland's outer diameter, insert the gland, secure from inside, and apply a generous bead of Dicor around the perimeter outside. Inspect annually and reseal if the Dicor cracks.

How to Install Solar Panels on an RV or Van Roof

Installing solar on a van or RV roof is a weekend project that pays dividends for years. Here's the full process from planning to commissioning.

Before you start

You need:

Panels selected and sized (see how much solar you need)
MPPT charge controller (see best MPPT controllers)
Mounting hardware: Z-brackets or thin-profile feet
MC4 extension cables, MC4 connectors, MC4 crimper
Cable entry gland (Hehr, Renogy, or Victron)
Dicor self-leveling lap sealant
12–10 AWG cable for panel-to-controller run (size per amperage and run length)

Step 1: Plan panel placement

Sketch your roof layout before drilling anything. Considerations:

Vents, AC units, antennas — panels must clear these by 4–6 inches for airflow
Shadow avoidance — even small shadows on one panel reduce output for all panels wired in series
Cable run path — minimize the length from panels to entry gland to controller
Weight distribution — balance heavier panels front/rear

Rigid panels typically mount 1–2 inches above the roof surface on Z-brackets. This gap allows airflow underneath, which reduces operating temperature and improves output by 5–10%.

Step 2: Mark and drill mounting holes

Mark bracket positions on the roof. Use a bit sized for your bracket bolts (typically 1/4").

Before drilling: tap the roof deck from inside to confirm you're not drilling through a frame member, rib, or electrical conduit.

Apply butyl tape or VHF adhesive under each bracket foot before setting. Run a stainless bolt through the bracket, roof, and inside, and secure with a stainless nut and fender washer inside. Apply Dicor sealant over each bolt head on the outside.

Step 3: Mount the panels

Set panels in brackets and secure. Z-brackets connect directly to the panel frame. Thin-profile feet (like Renogy's) or VHF bonding systems can also work without penetrating the roof at all — for bolt-free installs on certain roof materials.

For rigid panels: use stainless M5 or M6 bolts through the frame holes. Secure firmly — panels must survive highway speeds and wind loading.

Step 4: Wire panels (series vs parallel)

Series: Connect positive of panel 1 to negative of panel 2, etc. Adds voltage. One MPPT input string.
Parallel: Connect all positives together, all negatives together. Adds current. Requires multiple MPPT inputs or a combiner.
Series-parallel: Mix for optimal MPPT input voltage.

Use your MPPT controller's input specs to determine the best configuration. Most 12V van MPPT controllers accept 25–50V input — two 20V Voc panels in series is ideal.

Connect MC4 Y-connectors at the panels for parallel strings, or use MC4 branch connectors.

Step 5: Install cable entry gland

Drill an entry hole as close to the panels as practical (typically near the front of the roof where a wall runs below). Size the hole per the gland manufacturer's spec.

Feed cables through the gland from above. Seat the gland in the hole, secure the inner locking ring, and route cables down the inside wall toward your charge controller.

Apply a thick bead of Dicor self-leveling sealant around the gland perimeter on the roof outside. Tool it into any gaps. Let cure 24 hours before washing or driving.

Step 6: Connect to MPPT controller

Run panel cables to the MPPT controller's PV input terminals. Observe polarity — typically red (positive) and black (negative) — and confirm your wire gauge is appropriate for the PV string current (see AWG wire guide).

Add an in-line fuse or breaker on the PV positive conductor if your MPPT doesn't have one built in.

Step 7: Connect controller to battery

Run cables from the MPPT battery terminals to your battery bank's bus bar or directly to the battery. Add an appropriately sized fuse (typically 30–60A depending on controller rating) within 12" of the battery positive terminal.

Set your MPPT controller to the correct battery type (LiFePO4 or AGM), configure absorption and float voltages, and check for panel output on the controller display or app.

Commissioning checklist

PV input voltage matches expected (Voc × number of panels in series)
Controller shows charging (not faulted)
Battery voltage rising
All roof penetrations sealed with Dicor
Cables secured with clips or loom along the roof and down the wall
No exposed conductors inside the van