Charge Kit For Towed Vehicle to Keep Battery Topped Off

Question:

Hi there, I need to build a DC to DC car battery tender to maintain my car battery charged during travels unfortunately I don’t have an AC outlet to use the factory tender provided with the car = input 110V AC, output 12V DC, 3.3A, 4-step charging. I was considering a motorcycle/maritime 12V battery as the auxiliary and then part #2024-07 feeding stable 12V into the stock car battery. I saw the minimum output of #2024-07 is 4A higher than max desired 3.3A and, additionally, I am not sure if the aux motorcycle/maritime battery capacity would suffice for extended periods of time. Any feedback on the setup would be highly appreciated. Thank you in advance,

asked by: Nino C

Expert Reply:

Sounds like what you are after is something like the Roadmaster Battery Charge Line kit part # RM-156-25 which is a 10 gauge wire that runs to the towed vehicle battery and gives it a maintenance charge. This would be a simpler and better solution than the breakaway battery charger you mentioned.

expert reply by: Jameson C