Ctek D250s Solar Panel Size

I wanted to know what the input limit was on the redarc.

Ctek d250s solar panel size. Alternator is a standard non electronic type. If using multiple panels connect in parallel and ensure open circuit voltage is less than 23v dc. No external regulator is to be fitted on solar panel. Just wanted to confirm difference and maybe this justifies the price difference.

If you ve bought a panel with that high a voltage to use with the ctek you re out of luck. I ve had a ctek d250s in my hilux canopy for a few years. Minimum solar panel is 40w and a maximum 500w. Do not use with panels connected in series.

I want to add solar panels but the manual that comes with unit is silent on the question of what solar input it is able to handle so i queried it with ctek sweden and the following reply has come back from them. It has been working fine. You can also assist the power you get from your ctek d250 by adding a ctek smartpass to your system. Ctek 250s dual specs and yeah i don t see any solar specs either.

I tried 2 different batteries. I cannot keep the battery charged with the alternator and solar panel. Warning when using with solar panels the panel open circuit voltage must not exceed 23v dc or the ctek unit may be damaged and the warranty voided. It is a temperature compensated 5 stage charger battery isolator and mppt controller.

It seems to be able to both step up and step down the voltage from both sources to do the 5 stage charging. Open circuit voltage of solar panel in full sun is 22 volts dc max. The ctek d250 has a built in solar regulator so the panels you use do not need additional regulators. I put a volt meter to solar panel and it puts out 22 volts open circuit.

If you do use the ctek d250 with panels that have built in solar regulators it will still charge but not as efficiently. I currently run my ctek d250s connected to two 100ah lead crystal batteries. As stated max permitted is 21 22v. I added a 250w solar panel today connected it to the d250s to charge while i m not driving.

And the 5 stage charging can get its power from a solar panel or the alternator. Total power rating of the solar panel. Service battery can be agm or flooded type as per user manual. I connected the ctek d250s to the solar panel for 3 days in full sun and it could not charge the battery over 12 4 volts.

I have a 250w panel which is under the max voltage at open circuit. Standard wiring for ctek d250s dual. Most panels seems to have an output above 30v. 3 i got from a previous question i asked that the maximum input on the solar side for the ctek was 25a.