PWM vs MPPT: solar charge controllers compared (plus recommended models)
If you have a battery bank in your RV, boat, or other off-grid setting that you want to charge with solar panels, you need a charge controller.
In a system where solar panels charge a bank of batteries - whether lead-acid or lithium-ion - a charge controller sits between them and regulates the flow of electricity into the batteries.
While grid-connected solar panel systems also use charge controllers, this article will focus on smaller scale applications, such as 12 volt systems for RVs, boats, and cabins.