Can I Charge My Starter Battery and Leisure Battery at the Same Time with Solar?

Yes, with the right setup. Most systems charge the leisure battery first, but you can also top up the starter battery using a dual-battery solar controller, trickle charger or battery maintainer. This is especially useful when your vehicle sits in storage to prevent the engine battery from going flat.

• A dual-battery solar charge controller, or
• A battery maintainer / battery master device that diverts spare power to the starter battery.

This is useful if your vehicle is parked for long periods, as it helps prevent the starter battery from going flat while your leisure battery is being maintained.