RV & Camper Electrical Cable Pass-Throughs

RVs, camper vans, motorhomes, and overland builds route electrical wiring through many different parts of the vehicle—from rooftop solar entries and house-battery compartments to floors, cabinet partitions, and chassis penetrations. VoltPassThru helps create clean mechanical cable-entry points while directing each installation toward the appropriate Auto or Solar sizing path. Choose the routing location first, then verify the cable’s actual outside diameter, required mounting-hole size, panel thickness, and available rear clearance.

VoltPassThru RV and camper cable pass-through applications for rooftop solar, electrical compartments and floor chassis wiring

Choose the Series by Where the Cable Is Routed

Vehicle / Chassis Routing

VoltPassThru Auto

For cable routes involving the vehicle firewall, chassis, floor pan, alternator wiring, starter/battery routing, or other automotive structural penetrations.

  • Engine bay to passenger compartment
  • Alternator or starter-battery cable routing
  • DC-DC charger feed through vehicle firewall or floor
  • Chassis / underbody cable transitions
Auto Sizing Guide →
Explore Auto Series

House Electrical / Off-Grid Routing

VoltPassThru Solar

For rooftop solar cable entry, house-battery systems, inverter compartments, electrical cabinets, interior partitions, and off-grid power equipment.

  • Rooftop solar cable entry
  • House battery / inverter compartment
  • Solar controller and electrical cabinet entry
  • Interior power-system partitions
Solar Sizing Guide →
Browse Compatible Pass-Throughs

Common RV & Camper Cable Pass-Through Locations

Application 1

Roof & Exterior Solar Cable Entry

PV Wiring, Roof Panels & Exterior Equipment

Rooftop solar and exterior equipment route cabling through the RV roof or upper body into interior distribution spaces. Sizing centers around measured Cable O.D., panel thickness, mounting-hole size, and usable thread reach.

  • Rooftop solar wiring entering interior cabinetry
  • Exterior solar array and equipment cabling
  • RV roof and upper-body panel transitions
Installation Note: The cable gland manages the cable pass-through itself, but the overall RV roof penetration may also require appropriate flashing, roof-compatible sealant, mounting methods, or manufacturer-specific roof-system practices.
Solar Sizing Guide →

Application 2

Battery & Electrical Compartments

House Batteries, Inverters, Chargers & Distribution

House battery banks, inverter bays, and distribution cabinets require heavy cables passing between compartments and interior partitions. Selection balances measured Cable O.D., panel thickness, usable thread reach, rear clearance, and bend radius.

  • House battery to inverter DC cabling
  • Battery bay to cabinet wall partitions
  • Inverter and charger distribution wiring
Routing Note: For house batteries, inverters, and interior cabinets, route toward VoltPassThru Solar.
Solar Sizing Guide →

Application 3

Floor, Chassis & DC-DC Routing

Vehicle-to-House Electrical Transitions

Electrical circuits crossing from the vehicle chassis into the living space—such as alternator-to-DC-DC charger lines, underbody feeds, or auxiliary battery routes—pass through structural floor pans and automotive sheet metal.

  • Alternator-to-DC-DC charger cable feeds
  • Vehicle floor pan and underbody transitions
  • Chassis-to-house-electrical wiring
Routing Note: When penetrations cross the vehicle firewall, chassis, structural floor, or automotive sheet metal, route toward VoltPassThru Auto.
Auto Sizing Guide →

Auto or Solar? Start With Where the Cable Passes

An RV may use both VoltPassThru product paths. If the cable passes through automotive structure such as the firewall, chassis, or vehicle floor, start with VoltPassThru Auto. If it passes through a solar enclosure, battery compartment, inverter cabinet, or house-electrical partition, start with VoltPassThru Solar.

Vehicle / Chassis → Auto Sizing
Solar / House Electrical → Solar Sizing

Understanding RV Panel Materials

Primary Path: Auto

Vehicle Sheet Metal

Factory floor pans, firewalls, and exterior sheet metal. Route toward VoltPassThru Auto. Deburr clean holes, protect bare metal against corrosion, and verify rear clearance for locknut tightening.

Typical Applications: Floor pan pass-throughs, underbody transitions, firewall penetrations.

Primary Path: Solar

Plywood & Composite Cabinetry

Interior equipment bays, battery boxes, and conversion partitions. Route toward VoltPassThru Solar. Verify total panel thickness against usable thread reach and confirm mounting surfaces provide sufficient rigidity.

Typical Applications: Battery boxes, power center dividers, furniture pass-throughs.

Primary Path: Application-Dependent

Fiberglass & Composite RV Panels

Camper exterior body walls, fiberglass roofs, and molded storage bays. Path depends on application. Drill cleanly to prevent gelcoat chipping, seat sealing washers evenly, and avoid overtightening.

Typical Applications: Exterior wall penetrations, molded storage bays, roof transitions.

Primary Path: Solar

Electrical Enclosure Panels

Dedicated battery boxes, inverter cabinets, and combiner enclosures. Route toward VoltPassThru Solar. Size strictly by measured Cable O.D., ensure a flat surface for sealing washers, and allow cable bend clearance.

Typical Applications: Weather-tight junction boxes, combiner boxes, battery bank enclosures.

RV Cable Routing & Support Considerations

Measure Finished Cable O.D.

Measure actual jacket outside diameter with calipers across multiple points; nominal AWG or mm² conductor sizing does not determine finished cable diameter.

Maintain Cable Bend Radius

Avoid sharp right-angle bends directly after the pass-through; provide adequate looping space, especially on heavy battery or inverter conductors.

Support Heavy Cable Runs

Anchor cable runs with mechanical clamps along the route so the pass-through fitting does not carry unsupported dynamic cable weight during vehicle motion.

Verify Rear Clearance

Ensure sufficient interior room behind the panel for locknut tightening, tool access, cable bend radius, and anti-chafe components where applicable.

Check Panel Thickness

Camper cabinetry, insulated floors, and composite walls often exceed sheet metal; verify the complete panel stackup against usable thread reach.

Protect Cut Metal

For vehicle sheet-metal penetrations, deburr the hole thoroughly and treat exposed bare metal with corrosion protection before assembling hardware.

Weather & Environmental Sealing

Environmental Sealing
When correctly sized and properly installed, the compression gland creates a dust-tight, air-tight, and weather-tight cable entry around the cable jacket and mounting surface. Exterior RV penetrations may also require application-specific flashing, sealants, roof-system components, or manufacturer-approved installation practices around the overall penetration.

Choosing Metal or Nylon for an RV Installation

Heavy-Duty / Extended Reach

Metal Pass-Throughs

Machined nickel-plated brass construction provides mechanical durability for heavier cables, substantial bulkheads, and vehicle sheet metal. Applicable models feature extended thread reach and a threaded rear anti-chafe bushing to protect conductors against vehicle vibration.

Lightweight / Non-Conductive

Nylon Pass-Throughs

Lightweight PA66 polyamide body delivers compression cable grip and natural electrical isolation. Well suited for interior cabinets, electrical enclosures, fiberglass panels, and smaller cable entries where non-conductive construction is desirable.

Need the Correct Hardware Size?

Once you know where the cable passes through the RV, measure the finished Cable O.D. and use the appropriate Auto or Solar sizing guide.

Auto Sizing Guide →
Solar Sizing Guide →

For step-by-step panel drilling, washer orientation, and locknut mounting, see our Cable Pass-Through Installation Guide.

Frequently Asked RV & Camper Wiring Questions

Q Should I use VoltPassThru Auto or Solar in my camper van?
Use Auto as the starting path for firewall, chassis, automotive floor, alternator, or starter-battery routes. Use Solar for rooftop solar, house batteries, inverter compartments, electrical cabinets, and interior power partitions. Final hardware selection depends on measured Cable O.D., hole size, panel thickness, and clearance.

Q Can I use a cable gland for an RV roof penetration?
A compatible pass-through may be used to route the cable through a suitable roof or enclosure panel. The overall roof penetration may also require manufacturer-approved flashing, sealant, mounting hardware, or roofing practices suited to your specific roof construction.

Q How should I route cable from the chassis battery to a DC-DC charger?
Plan the route away from heat sources and moving suspension components. For routing through the vehicle firewall, chassis, or sheet-metal floor, start with the Auto sizing path and verify cable support on both sides.

Q How do I size a pass-through for inverter or battery cable?
Measure the actual finished Cable O.D. with calipers, as nominal AWG or mm² conductor size does not determine jacket diameter. Then verify mounting-hole size, thread reach, rear clearance, and bend radius.

Q Can the same hardware be used through plywood, fiberglass, and metal?
Yes, provided the mounting-hole diameter, panel thickness, cable O.D., and rear clearance are compatible. Different panel materials require appropriate drilling, reinforcement, sealing, and corrosion protection.

Q Should heavy battery cable be supported after the gland?
Yes. Heavy battery and inverter cable runs should be mechanically secured with clamps or supports so the pass-through fitting does not carry unsupported dynamic weight during vehicle motion.

Ready to Plan Your RV Cable Route?

Identify where the cable crosses the RV first. Then choose the Auto or Solar sizing path and verify Cable O.D., mounting-hole size, panel thickness, and available clearance.

Firewall / Chassis Routing → Auto Sizing Guide
Solar / House Electrical → Solar Sizing Guide

Not sure which path applies? Measure your cable’s finished outside diameter and contact us with the cable location, finished Cable O.D., and panel type.

For utility, equipment, and enclosed cargo trailer installations, see our Trailer Wiring Guide.

Related Applications & Guides