PlugIn Solar Guru
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RV/Camper

An RV is its own little grid: panels on the roof, a 12 V battery bank, a charge controller between them, and an inverter for the outlets. Plug-in solar laws do not apply.

Solar Panels Make the power Rigid panels on the roof for most RVs; lightweight flexible panels where weight or a curved roof matters. Battery Store it for later LiFePO4 (lithium iron phosphate) has replaced lead-acid in most new RV builds: lighter, deeper usable capacity, and a built-in battery management system. Inverters Turn it into power your stuff can use Two boxes do the work: an MPPT charge controller feeds the battery from the panels, and an inverter/charger turns the battery into 120 V outlets and charges it from shore power. Build Your Own Kit Pick all three that fit Enter what you use in a day and how long you stay off shore power. The calculator sizes the battery, panels, controller and inverter for a 12 V system.

Know this first

  • Most RV systems run at 12 V. The panel, controller, battery and inverter all have to match that voltage.
  • LiFePO4 batteries must not be charged below freezing unless they have built-in heating; Battle Born's data sheet lists its 25 F charge floor for the heated model.
  • An inverter/charger also charges the battery from shore power and switches over automatically.

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