CTEK D250SE Battery to battery charging system. Intelligent 20A system compatible with Euro 6 engines. Complete with clear, comprehensive fitting instructions. Designed specifically to fit variable voltage alternators. Built in MPPT solar controller. DC-DC Battery to battery charging system. Product description Newer vehicles are fitted with variable voltage charging systems to help reduce emissions, this means conventional VSR relays are no longer appropriate to use. Don’t worry though, we have it covered with the intelligent CTEK D250SE charger. This unit is highly reliable and has a built-in solar controller to take panels of up to 200W (12V only panels). This kit comes with the wiring system built to the correct specifications using professional equipment and expertise. It is fused at either side using 30A fuses to protect your cabling and the charger. The wiring system is made from 6.0mm2 (for lengths up to 5M, over 5M it would be 10mm2 cable) wire and is fully labeled ready to install.