The D250SE is a 5-step, fully automatic charger for 12V batteries. It can charge lead-acid, AGM, and lithium batteries and is compatible with alternators, solar panels, and wind turbines.
The D250SE is a fully automatic, 5-step charger that can provide up to 20A of power to any 12V lead-acid or lithium-ion service battery with a capacity of 40–300Ah. It offers selectable charge algorithms for flooded, AGM, and lithium batteries and can draw power from either the alternator or a solar panel or wind turbine. The D250SE can maintain a stable output of up to 20A for vehicles equipped with smart, ECU-controlled alternators and also has a temperature sensor that optimizes charging regardless of weather conditions.
The D250SE is designed for use with solar panels rated at up to 300W, but it won’t be damaged if a larger panel is connected, as long as the voltage from the panel is no more than 23V. (The open circuit voltage cannot exceed a maximum of 23V.) Connecting a larger panel can actually be a good way to compensate for poor performance on cloudy days!
The D250SE also features a battery maintenance function that sends 3-second pulses to the starter battery every 15 seconds. The current will vary depending on the amount of power from the solar panel and the voltage at the starter battery.
The D250SE is ideal for use in campervans, especially those with smart alternators, and can be used on its own or with a CTEK Smartpass. The Smartpass 120S is also lithium-compatible.