Good segway for another thread ... So, how many amps does a starter draw? I have a BlueSea ML-ACR (rated to 500A) with a jump-start feature like a BatteryDoctor. BlueSea says no fuses if it's ever going to be used that way. For charging-only applications, they spec a fuse at both battery ends (starter and house bank). Oddly, BD only specs a fuse at the house bank end (150A). That seems kinda low given that Google says starters draw closer to 250A.I just noticed that Harbor Freight has a new lithium jumper on sale... gets great reviews. I can't figure out how it (and yours) works so well... seems like it just wouldn't be strong enough.
I'm not comfortable with going fuseless just for the rare jump start. What size fuses (both ends) would support jump starting and still adequately protect the normal charging circuit (i.e., big but not too big)?