To all you 12V specialists out there.
Good afternoon Although this is not strictly RV related, I thought that there was a large amount of 12V battery knowledge here so I am going to give it a shot. I have two dissimilar 12V batteries. ...
Forum Discussion
kampinguru wrote:
I am not sure how to insert pictures. I have a motorcycle battery in the bike and I have made a jumper to go positive to positive and negative to negative to the car battery with a 15amp fuse inline on the positive wire. I have a 2A automatic charger connected to the car battery.
What exactly are you trying to accomplish by doing this ?
The bike battery won't add much to your total capacity AND you probably already have killed it by running it down so far.
My advice: Leave the motorcycle battery to the bike only.
If you need more battery capacity for the RV (or whatever it is), buy another bigger or more batteries of similar size and capacity.
Running two batteries of vastly different capacity like that never works out good for very long.
EDIT: And the main feed should be on the big battery.....at the big cables.....both for discharge and for charging. As was said, if you wire it right most of the current flow, both out and in, will be on the larger battery and you won't have to worry about bigger gauge wire between the two.....but I wouldn't use anything smaller than 12 ga for a main feed off of any type of power source.
