How to Wire an HPP+ Solar Bulkhead Inlet on Your RV

By Portable Power Stations, Solar Generators | Published: 2026-11-01

Category: How-to Guides

A step-by-step guide to installing the HPP+ Solar Bulkhead Inlet for clean solar cable routing from your RV roof to a Yeti PRO 4000, with key checkpoints and common mistakes.

Quick answer

To wire the HPP+ Solar Bulkhead Inlet, mount the inlet on your RV's exterior, connect the attached 12.5-inch HPP+ cable to your solar panels, and plug the other end into your Yeti PRO 4000. This provides a weather-resistant entry point for solar cables.

Why a bulkhead inlet simplifies solar cable routing

Routing solar cables through windows or doors can create drafts, water leaks, and tripping hazards. A bulkhead inlet gives you a dedicated, sealed passage through the RV wall, so you can keep panels connected without compromising the interior. It also reduces wear on cables from repeated setup and teardown.

The HPP+ Solar Bulkhead Inlet includes a 12.5-inch HPP+ cable, so you don't need a separate adapter for the outside connection. Inside, you connect to your power station using an HPP+ extension cable if needed.

Choosing the right location

Pick a spot on the exterior wall that is close to where you plan to set up panels and within reach of your Yeti PRO 4000 inside. Avoid areas behind appliances, near heat sources, or where water pools. Check both sides of the wall for obstructions before drilling.

Keep the inlet at a comfortable height for plugging and unplugging, and ensure the cable can slope downward from the inlet to shed water. If you're unsure about wall construction, consult your RV dealer.

Step-by-step installation

Plan and mark the hole: Use the inlet's mounting flange as a template to mark the cutout on the exterior wall. Check for studs, wiring, and plumbing with a stud finder and visual inspection. Common mistake: cutting before verifying clear space inside and out. Double-check both sides of the wall before drilling.
Drill the pilot hole and cut the opening: Drill a pilot hole from the inside or outside, then use a hole saw or jigsaw to cut the opening to the size of the inlet's cable pass-through. Deburr the edges and seal any exposed wood or metal with paint or sealant. Checkpoint: ensure the hole is large enough for the cable connector but not so large that the flange won't cover it.
Apply sealant and mount the inlet: Apply a generous bead of non-hardening RV sealant around the flange, then press the inlet into place and secure it with screws. Wipe away excess sealant. Common mistake: using silicone that hardens and cracks; use a flexible sealant rated for outdoor use.
Connect the solar panels: Connect your solar panels to the HPP+ cable on the outside of the inlet. Ensure the connectors are fully engaged and the cable has a drip loop. Checkpoint: verify polarity with a multimeter before plugging into the power station.
Route cable inside and connect to Yeti PRO 4000: Feed the interior end of the cable to your Yeti PRO 4000. If the attached cable is too short, use an HPP+ extension cable. Plug into the solar input. Common mistake: leaving a tight bend or strain on the connector; provide slack and secure the cable with clips. Test the connection with a small load before closing up.

Product facts

HPP+ Solar Bulkhead Inlet: The inlet comes with an attached 12.5-inch HPP+ cable and is rated for 40A at 10 AWG. The attached cable saves you from buying a separate adapter, and the 10 AWG gauge supports typical solar array currents without excessive voltage drop.
HPP+ Solar Bulkhead Inlet