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RV solar power, explained component by component.

Guides to sizing, choosing and wiring solar panels, charge controllers, batteries and inverters. Start with the part you’re working on, or size your whole system step by step.

Size your system Buying guides

30 guides, newest published September 17, 2026.

Planning & sizing5 guidesSolar panels6 guidesCharge controllers4 guidesWiring & charging4 guidesBatteries7 guidesInverters4 guidesYour 120V loads

Pick a component to see its guides.

Planning & sizing5 guidesSolar panels6 guidesCharge controllers4 guidesWiring & charging4 guidesBatteries7 guidesInverters4 guides

Size your system in five steps

Work through the steps in order. Each one uses numbers from the steps before it.

Start with step 1
RV interior workspace for an energy audit with meters and notebook

  1. Audit your daily power use

    List every electrical load with its wattage and daily run-time before sizing anything.

    Result Daily watt-hours

    How to Do an RV Energy Audit

  2. Size your solar array

    Turn daily watt-hours into panel watts, allowing for peak sun hours and system losses.

    Result Array watts

    How Many Watts of Solar Do I Need for My RV?

  3. Choose 12V or 24V

    Use your array size and biggest inverter loads to pick the system voltage.

    Result System voltage

    12V vs 24V Solar for RVs

  4. Size your battery bank

    Turn daily watt-hours into amp-hours at your system voltage, with depth of discharge and days off-grid.

    Result Battery amp-hours

    How Many Amp Hours Do I Need for RV Boondocking?

  5. Size the charge controller

    Divide array watts by battery voltage, then check cold-weather panel voltage.

    Result Controller amps

    RV Solar Charge Controller Sizing

Guides by component

Pick the part of the system you’re working on. Each one starts with the guides to read first.

New guides

All 30 guides
Camper van battery bay with 200Ah LiFePO4 battery at golden hour
Buying guide

Best 200Ah LiFePO4 Battery for RV: Top Picks & Guide

Best overall pick: LiTime 12V 200Ah, for all-around weekend boondocking and first-time lithium upgrades.

September 17, 202613 min read

Buying guides

Each guide matches products to the trips and rigs they suit, then lists what to confirm before you order. No brand pays to be featured.

All 11 buying guides

How SunAmpRV guides are made

  • Built on published sources

    Every guide is researched from published sources.

  • Fact-checked before publishing

    Facts are checked against those sources before a guide goes live.

  • The math is shown

    Sizing guides walk through the formulas and worked examples, so you can run the numbers for your own setup.

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