Clearly stated in the manual is the input of this unit of 23v! if you do not check your input and it exceeds 23v you will blow this unit up! It is advised that solar panels do not exceed 21 volts due to cold weather spikes,units blown up by  over voltage input are not covered by the warranty.DescriptionCTEK D250SE Dual DC-DC ChargerDual input 20A charger with selectable charge voltages

Enjoy more and relax.

With award winning Swedish technology, the dual input D250SE allows you to enjoy your vehicle more with maximized battery capacity as the ideal charger for vehicles without access to a mains power supply.

The D250SE is a fully automatic, 5 step charger that supplies up to 20A of power to any 12V lead-acid or ­lithium* service battery from 40–300Ah. It has ­selectable charge algorithms for AGM and lithium* batteries and can use power through its dual input from alternator, solar panel and wind power. When the service battery is fully charged, the D250SE will ­automatically redirect maintenance charge ­power to the starter battery. The D250SE can maintain a stable output up to 20A to vehicles fitted with smart ECU controlled ­alternators and also has a temperature sensor for optimised charging, regardless of weather conditions. *) 12V lithium batteries (LiFePO4, Li-Fe, Li-iron, LFP)

Features

• 20A fully automatic temperature compensated charging for batteries from 40-300Ah while you’re on the move
• Dual input (solar and alternator in parallel)
• Smart alternator compatible
• Selectable lithium* and lead-acid mode
• Solar panel regulator with Maximum Power Point Tracking (MPPT)
• *) 12V lithium batteries (LiFePO4, Li-Fe, Li-iron, LFP)
• Battery separation replacing diodes and VSR relays
• Selectable AGM option – 14.4V or 14.7V
• Maximised charging for better battery life and performance
• Temperature sensor to compensate for hot or cold conditions
• Splash and dust proof (IP65)
• Compatible with SMARTPASS 120 for the ultimate 140A power management solution

Download PDF Datasheet