Quote:
Originally Posted by steffen707
Do you mean that the defrost, wipers, fan and headlights would draw too much power from the dc/dc converter and so to not worry about the capacity, you'll just have the motorcycle battery to buffer the higher amp draw?
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Motors tend to draw higher amps when they start up, so while the wiper motor might only draw say 50 watts or around 4 amps while it's running (a guess) it might draw 4 times that for a fraction of a second when the motor first kicks on, so if you have your head lights and wipers on, then turn the deforst fan on, that deforst fan is going to have a high surge when it first turns on as well and there might be the freak timing where everything gets flipped on at the same time and a little 8 pound, 6amp hour motorcycle battery can handle a big surge, after all it's designed to handle a 200 amp load of the motorcycle starter for a few seconds, or you can keep your stock starting battery and use that as the buffer, and if you need to replace your starting battery soon think about getting a smaller/cheaper starting battery that is of course still sized large enough for your starter, it would making wiring all of this up a lot easier, then your higher voltage pack would be using the dc to dc converter to keep the starting battery up at 13.7v, just like the alternator did.