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Charging separate battery banks from a single solar panel

If you would like to charge two separate battery banks from a single regulator circuit, then you'll need one of the more complex regulators such as the Victron BlueSolar DUO LCD USB 12/24V 20A or the EPEVER DuoRacer 30A MPPT Dual Regulator. These regulators have two sets of battery output terminals so the current from your solar panels charges both banks simultaneously. This is particularly useful for motorhome, caravan and narrowboat owners, as they have a 12V starter or service battery, as well as the 12V leisure battery bank.

solar wiring diagram
Solar charging system with dual controller - charging two separate battery banks

Need to know more? Have a look at:

  • How to choose batteries for off-grid applications
  • Wiring several panels in parallel for 12V systems
  • PWM or MPPT? Choosing the right regulator for off-grid systems