Can't compare a DC-DC charger with the NL solenoid system. The fact that NL are now selling DC-DC systems shows that even they are aware of the limitations.Craig Lord wrote: ↑26 Feb 2020 10:43I run the national luna 25amp dc/DC charger with a blue nova lithium 100amp hour deep cycle battery in the national luna box. Charges up the battery from 30% to full in just over 3 hours drive. It can also take power from a solar panel. With this I run 2 Waeco CF 50 fridges, on as a freezer and one as the fridge and the rest is used to charge up various things. The battery ran the fridges for 3 full days in a test I did at home, could have gone more but I got over waiting Haha Couldnt be happier with the setup, I've never had an issue with charging. Best advise is spend the bucks on a good battery and DC DC charger. Dont watse time with the solenoid system the DC DC does this for you also.
Edit: the national luna 25 amp DC/DC charger also caters for lithium batteries.
Ian, I am not saying they can't work or that they are unreliable if operated carefully.
What I am saying is that they cannot fully charge deep-cycle, lead crystal, AGM or Li-Ion batteries. The car's alternator simply doesn't produce the required voltage.