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CTEK D250SA 12V 20A Solar + DC-DC Charger - $270.75 Free C&C (+$9.90 Delivery) @ Repco

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STMATESRATES

Seems like a good price for these which appear to be on their way out to be replaced by the D250SE.

I've been using the D250S for years and it's a great bit of kit.

The Ctek D250SA is an intelligent DC-DC charger which maximises battery capacity as a charging solution where charging from mains power (AC) is not available. This makes it great for extended periods spent on the road or water. The 5 step process supplies 20 As of charging power to any lead acid battery from 40a/h all the way up to 300ah. The charger has multiple-input technology, meaning you can simultaneously supply charge from your alternator (including smart alternators for newer, hi-tech vehicles), solar panels or even from wind power. Once the intelligent voltage sensitive charger recognises that your deep cycle leisure batteries are topped off, it will supply a maintenance charge output to the vehicle's starter battery to ensure you have full cranking power when its time to fire up the beast. The device is an all-in-one in terms of implying and completing your 12v, off grid setup. It removes the necessity for messy voltage sensitive relays used to split charging between batteries and even means you can throw your cheap solar panel regulator in the bin too, thanks to its MPPT (maximum power point tracking) technology. The Ctek D250SA is designed to endure tough conditions including operating temperatures ranging from negative 20 degrees Celsius all the way up to 50 degrees Celsius and with a 2 year warranty as standard you can trust that this 12V solution will go the distance in your 12v setup.

  • Ambient operating temperature: -20 ˚C to +50 ˚C (- 4 °F to +122 °F)
  • Positioning: Permanent installation / on board
  • Warranty: 2 years
  • Input: 11.5–23 V, 25 A
  • Output: 14.4/14.7 V, 20 A
  • Back current drain: Corresponding to less than 1 Ah/month
  • Battery types: 12 V:, WET, MF, Ca/Ca, AGM, EFB, GEL
  • Battery capacity: 40–300 Ah
  • Ingress protection: IP65
  • Ripple: Less than 4 %
  • Dimensions: 192 x 110 x 65mm (L x W x H)

Original Coupon Deal

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closed Comments

  • +1

    Just double check this if buying for a lithium battery. I think this model had a desulfation state which pulses a high voltage at the beginning of the charge. Can't be switched off.

  • Unfortunately no LiFePo4

  • +1

    Victron 18 amp is normally less than $250 on ebay, and can handle LiFePo4. Having gone from an MXS to a Bluesmart with Bluetooth, no going back.

    • Do they also have Solar input?

      • Big fan of Victron, but I believe the Victron doesn't have solar input.

        • +1

          Good point - I was more responding to the comment around Lithium. Yep to run solar, I have the 75|15, which of course is well over $100 on its own. However unlike a lot of DC-DC chargers, the standalone MPPT can handle up to 75V. Typical solar panels run from 18V (your typical portable) up to and over 35V (a residential panel), so I prefer to separate solar and alternator current for the trailer battery management.

          • @willyroo: I'm not in the market for one right now but would love to see your setup in a diagram if/when you have time.

            • @iwearpants: My big secret - the LC100 alternator puts out 14.1V, so no DC-DC :). Very simple :)

          • @willyroo: All good points, mine isn't even in a car, it's in a big camping battery box I built, I'm probably going to sell it or give it to my old man and buy a Victron too as I don't really use the alternator charging at all.

  • As far as I can tell, that's the only difference between the SA and SE models: SE supports LifePO.
    I have the SA and love it, lives under the bonnet and has been fantastic. Only downside over my previous system is that I can't directly link the two batteries if the starter runs flat, have to wait for the unit to back-charge from the service battery/solar panel or pull out one jumper cable if I'm in a hurry.

  • This is the older one, the new one D250SE is the one that supports LiFePO

  • do these work with smart alternators?

  • Why such a low voltage input? Aren't most solar panels 30- 50v each?

    A higher voltage (therefore less amperage) would also mean smaller cabling can be used.

    • They're designed for 12V panels

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