I finally got around to completing my dual battery install and in the process of stuffing around moving the car in and out of the garage a couple of times through the day and leaving it overnight (must have left the lights on or something), I managed to flatten the starting battery and it wouldn't start the following day. Not a problem I thought, I have an SBI12 with an overide feature....
So after knocking up a quick jumper to connect the override cable to the Aux battery connection on the isolator, I hit the start button and the car kicked over for about long enough to pump a few hundred amps through the 100 amp fuse on the second battery and pop the fuse without the car starting. Obviously the starter drew too much current from the second battery (because, err the main one was flat...) and this was why the fuse blew.
My question is, has anyone successfully used the override feature with a flat main battery, when the SBI12 is installed as per Redarcs instructions with a 100amp fuse and 3B&S between each battery and the isolator? I am trying to decide if it's worth bothering with a switch for the override, if it's just going to pop a fuse each time I use it there is no point.
All I can say is I am glad it happened at home in close proximity to a battery charger and not out in the middle of nowhere...
So after knocking up a quick jumper to connect the override cable to the Aux battery connection on the isolator, I hit the start button and the car kicked over for about long enough to pump a few hundred amps through the 100 amp fuse on the second battery and pop the fuse without the car starting. Obviously the starter drew too much current from the second battery (because, err the main one was flat...) and this was why the fuse blew.
My question is, has anyone successfully used the override feature with a flat main battery, when the SBI12 is installed as per Redarcs instructions with a 100amp fuse and 3B&S between each battery and the isolator? I am trying to decide if it's worth bothering with a switch for the override, if it's just going to pop a fuse each time I use it there is no point.
All I can say is I am glad it happened at home in close proximity to a battery charger and not out in the middle of nowhere...
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