Product description CTEK D250SEThe latest from CTEK the D250SE leverages on the good foundation of the D250SA Dual but raises the stakes again by including a Lithium Charge profile to feature alongside its ignition feed and MPPT solar controller. A wider input voltage range on the alternator side for Euro 5+ engine for ECU controlled systems.MPPT Solar input, alternator input with service battery charging from the solar or engine with a preference on the suns free energy. Not to mention the ability to add the SmartPass 120S or SmartPass 120 for an additional 120A charging output.