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With award winning Swedish technology, the dual input D250SA (Part #40-186)  can draw its power from smart alternators and other DC sources, making it the ideal charger for vehicles that don’t have access to a mains power supply. Its dual input capability means it can draw power from solar and wind sources, in parallel to the alternator. The D250SA is a fully automatic, 5 step charger that supplies up to 20A of power to charge, condition and maintain any 12V lead acid service battery from 40-300Ah, including Wet, MF, Gel, AGM. EFB and Ca/Ca. The D250SA uses patented technology so it’s safe for you and your vehicle’s electronics. It’s also IP65 classified (splash and dust proof, and suitable for outdoor use) and comes with a 2-year warranty.


  • Continuous, fully automatic charging while you’re on the move
    for maximum performance, battery life and convenience
  • Compatible with smart alternators
  • Protects, charges and maintains your starter battery –
    even if the engine is not running – and charges service
    batteries from your starter battery without the risk of
    starting problems
  • Fast charging from the alternator and other DC sources –
    even on short journeys
  • Automatic energy management in a single, easy to use unit
    – no need for traditional diodes or VSR relays
  • Environmentally friendly charging with solar or wind


Input 11.5–23V, 25A
Output Max 14.4V (14.7V in AGM), 20A
Back current drain Less than 1Ah/month
Ambient temperature -20°C to +50°C (-4°F to +122°F)
Battery types All types of 12V lead-acid batteries (WET, EFB, Ca/Ca, MF, AGM and GEL)
Battery capacity 40–300Ah
Dimensions 192 x 110 x 65mm (L x W x H)
Insulation class IP65 (splash and dust proof)
Part.nr 40-186
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