Ok just bought the blue smart Ip22 12/30/1 charger. Can I power this device from my 25amp rated Merc Sprinter cig lighter whilst driving in conjunction with my 300w modified sine wave? I was thinking I could set the current to 15amps nightmode/low current as to not overload the cig lighter? Anyone know if the charger will work properly from a modified sine wave? Probably just use in bulk mode to charge up my 2x50ah Lifepo4 batteries in winter with little or no sunshine. No I haven't got a dc-dc charger. I'm a newbie so please keep it simple for my very limited 12v electrics knowledge. Thankyou :-)