This should also work the other way around (but without power from the altenator of course). I have not thought about using a DC to DC charger from my battery pack to starter battery.īut i have been thinking about getting the latest Victron Smart DC DC charger for charging my battery pack when i am driving the car on longer trips. Yes, i also noticed the small wires on a lot of those jumper packs. that might blow but can be replaced if need be. Only thing between the switch and battery is the 400A fuse. Like you said, the switch should be ok if i don't make a hobby out of it. So in a pinch i think i can get away with that. The prismatic cells i used for my battery pack can handle a short 300A - 400A pulse i see in the specs. So not a big diesel or something that i had in mind for backup jump starting. My car is a 2011 Mitsubishi Outlander, with a (small for USA standards) 2.0L petrol engine. It would take a while, but should be safer than a direct connection.Ĭlick to expand.Hi, thanks much for your response! You could use a 12v DC-DC charger to isolate the batteries and use the LiFePO4 to charge the car battery. I'd be careful about this though since I'm not sure how much current flow you'd have. Many car batteries are designed to charge at ~13.8 volts and given that your pack is 13.3 volts 90% charge you could potentially connect it directly to the car battery to charge it. A lot of commercial lipo jump packs claim 800A+ but have suspiciously small wires, which indicates they don't need to source high current for all that long.
You could go directly to the large bus bars but then would still be limited by the 200A switch, though it could potentially be ok since the draw would be for a short duration. With your 105Ah batteries this would represent a drain of ~4C, can your batteries support that? 400A is also more than your Anderson plug, fuse, switch, and relay are rated for. What kind of car are you hoping to jump start? I did a quick search and it seems that many cars can require ~400A to turn over the engine. Hope you guy's can give me some advise on this matter. So what would be the best way to go about this.? If i do that there is "only" the 200A Main switch and the 400A fuse in line. On the beefy 3 way M8 busbars you see on the left (+) en right (-) of the pack. What i also can do is neglect the 125A ANDERSON plug and just put a normal set of jumper cables directly It only powers the 200A Relais that powers the ANDERSON plug from busbar. The Victron Battery Protect in the photo is not in line with this ANDERSON plug, Here are some photos to show you how i have the ANDERSON plug connected:
is i could blow the 125A fuse behind the ANDERSON plug, damage the 200A relay, the 200A main power switchĪnd or blow up the last 400A fuse between the Main switch and LIFEPO4 pack.
Or leave it connected to the DIY LIFEPO4 pack and jump start it like you normally do with a "normal" jumpstarter. We can do this by letting the battery's be connected to each other and let the low 40AH (acid) battery balance and hopefully have a high enough voltage to start.ĭisconnecting the DIY LIFEPO4 pack first before trying to start the car.Ģ. Can i use the 125A ANDERSON connector to hook up some fairly beefy jumper cables with an ANDERSON connectorġ.
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