Shore Power and Solar: Plug‑In Options for RVs and Off‑Grid Homes
Shore power allows you to plug your RV, boat or tiny home into an external AC source—typically at a campground pedestal or marina. This connection lets you charge your batteries and power your loads without running your inverter or depleting your solar energy. Shore power complements your solar system and provides flexibility when sunlight is scarce or you need more power than your panels produce.
What Is Shore Power?
The term “shore power” comes from marine usage but applies to any off‑grid vehicle or structure that can plug into the grid. In an RV or camper, shore power refers to connecting your electrical system to a 110–125 V AC outlet to recharge batteries or power the camper directly. As one van‑life resource explains, shore power is a fancy term for plugging your camper into a 110 V plug to either recharge the batteries or power the camper’s electrical system directlyexplorist.life. When connected to shore power, your onboard charger or inverter‑charger converts AC to DC to charge the battery bank and may bypass the inverter to supply AC loads.
Components of a Shore Power System
Power inlet: A weather‑resistant inlet mounted on the exterior of your vehicle or tiny home. It accepts a standard RV power cord and connects to your AC distribution or inverter‑charger.
Power cord: A heavy‑duty cord (often 30 A or 50 A) that plugs into the shore pedestal or household outlet. Adapters (dogbones) allow connection to different receptacles (30 A to 50 A, 15 A to 30 A, etc.).
Inverter‑charger or converter: Converts the incoming AC into DC to charge your batteries and powers the AC loads. Many inverter‑chargers include automatic transfer switches, allowing seamless switchover between shore, generator and battery power.
Breaker panel: Distributes shore power to outlets and appliances. Ensure the panel is properly grounded and protected by GFCI devices.
Using Shore Power With Solar
When you plug into shore power, the inverter‑charger detects the AC input and switches from inverting to charging mode. Your solar charge controller continues to harvest energy, but many systems prioritize shore or generator power to provide maximum charging. You can still use solar simultaneously; the charge controller and inverter‑charger will work together to fill the battery. Some systems allow you to limit AC charge current to avoid tripping campground breakers.
Tips for Safe Shore Power Use
Check voltage and polarity: Use a tester to confirm the shore outlet is wired correctly before plugging in.
Use proper cords and adapters: Ensure your power cord is rated for the current you’ll draw. Do not use undersized extension cords.
Install a transfer switch: An automatic transfer switch prevents backfeeding and allows safe switching between shore, generator and inverter sources.
Protect against surges: Consider a surge protector to guard against voltage spikes or unstable power at campgrounds.
Maintain ventilation: Battery chargers and inverter‑chargers generate heat; provide adequate ventilation.
When Should You Use Shore Power?
– Battery charging: Plug in to recharge your battery bank quickly if solar production is limited or after heavy use.
– High‑demand appliances: Use shore power to run energy‑hungry devices like air conditioners or electric heaters without draining your battery.
– Seasonal storage: When storing your RV or boat, leave it plugged in with a smart charger to maintain battery health.
– Off‑grid cabin backup: Off‑grid homes can install a shore inlet and connect a generator or grid supply when solar is insufficient.
Frequently Asked Questions
Can I run solar and shore power at the same time? Yes. Your charge controller will continue to harvest solar energy while the inverter‑charger simultaneously uses shore power to charge the batteries. Most inverter‑chargers prioritize AC charging and automatically reduce solar charging if battery voltage rises too high.
Do I need an inverter‑charger for shore power? You need some kind of AC‑to‑DC converter to charge your battery. Many RV converters are chargers only, while inverter‑chargers combine DC‑AC inversion and AC‑DC charging. Hybrid inverters handle PV, batteries and shore power.
What size shore power cord do I need? Common sizes are 15 A (household), 30 A (most RVs) and 50 A (larger RVs). Choose the cord that matches your inlet and your power requirements.
Final Thoughts
Shore power is a convenient complement to your solar array. By plugging into grid power, you can quickly recharge batteries and run high‑demand appliances without draining your battery bank. Make sure your system includes a proper inlet, transfer switch and inverter‑charger, and use a surge protector for safety. For more on inverter‑chargers, see our inverter‑charger guide. To understand your solar wiring in detail, refer to our solar wiring schematic blog.
