Solar Charge Controllers


Solar Charge Controllers are the heartbeat of your RV Solar Kit charging system. They are designed to control the flow of power from your panel(s) to your batteries without overcharging. All of our Charge Controllers are PWM (Pulse Width Modulation) and MPPT equipped. PWM is a technology that provides the battery with the best possible charge by tapering the charge, monitoring the battery and maintaining a 90 to 95% charge. Many older or cheap voltage controllers, battery chargers and solar charge controllers have a system that is all on or all off. Many of those will bring your battery to full charge and then wait until the battery is around 85% before it will allow a charge again. A PWM Solar Charge Controller does this on/off cycle many times a second and takes notes of where the battery is to optimize the voltage charge of the battery.

PWM Leads To:

  • More capacity or battery charge (90% to 95%)
  • Better use of the input power. With old on/off technology the charge controller only uses solar when it’s on and that only happens when the battery drops below a certain voltage.
  • Longer battery life – keeps the heat and over-charge of the battery in check. A fuller battery all the time is best.
  • A happy battery and the ability to keep your battery for up to 3 times longer

We offer Charge Controllers in various sizes depending on the number and size of panels used. For example, a 100 Watt solar panel puts out approximately 5.6 Amps so an 8 Amp Solar Charge Controller would the be the minimum size controller for this example. Adding a Solar Charge Controller to your solar charging system will control and maintain your batteries when they are in use or being stored. We offer 2 and 5 Stage Controllers; 2 Stage Controllers are water and moisture proof.

5 Stage Controller Levels:

Level 1 – Soft Charge – When batteries suffer an over-discharge, the controller will softly ramp the battery voltage up to 10V.
Level 2 – Bulk Charge – Maximum current until batteries rise to Absorption Level
Level 3 – Absorption Charge – Constant voltage charging (battery is over 85%)
Level 4 – Equalization Charge – Only for WET battery or Calcium battery type. When the battery is deeply drained below 10V, it will automatically run this stage to bring the internal cells to equal states and fully complement the loss of capacity. (Gell and AGM batteries do not run Equalization Charge)
Level 5 – Float Charge – Battery is fully charged and maintained at a safe level. Fully charge is more than 13.6V.

When purchasing a Solar Charge Controller for an RV we recommend a 30 Amp Charge Controller even if you are only installing one 100 Watt solar panel so that in time, if you want to add another panel to your system, you will not need to change out the controller or wires. A 30 Amp Charge Controller will handle up to five 100 Watt solar panels (500 Watts). 

For Solar systems 500 Watts or larger, please see our 60 Amp Charge Controller.