Tuesday, Feb 27, 2007 at 22:30
Are you sure your alternator is only 30 amps.
The best way to do your battery set up is as follows....
1) Use an 80 amp Redarc Smart Solinoid.
2) Connect a battery cable from your starter motor battery input terminal to the input terminal of the Smart solinoid.
3) Connect a battery cable from the output terminal of the Smart solinoid to the + terminal of your aux 100amp battery.
4) Connect a battery cable from the - terminal of your aux 100amp battery to a large bolt or the original earth point of your vehicle.
5) Connect a wire from the + terminal on your 100amp aux battery to a multi fuse holder.
6) Take all you aux equipment (fridge,
camp lights etc.) off of the multi fuse holder.
For keypoint 2,3,and 4 use a minium of 3B&S cable.
For keypoint 5 use a minium 6B&S cable.
For Keypoint 6 use minium 4mm auto cable, 5 or 6mm is better still. (Depending on current draw and cable lenght.)
Never use a isloator switch for batterys always use some form of smart solinoid to controll the charging....it's set and forget.
We see so many people using 4 to 6mm auto cable to charge there batterys, most time 3B&S cable is over rated but it does not cost much more and it does not take any longer to install plus you know it will work OK.
The main concern for wire size is current draw and lenght, with a flat aux battery it is not uncommon to see 200 to 400amps of rush in current when connected to another battery.
The fuse holders we use are from
http://www.carroll.com.au/zone_files/product_pdf/carroll_catalogue_p49.pdf
and are the BFK one at the bottom of the page.
Always solder the wire to the fuse holder and spray all connections with a high grade electrical protectant greese.
Hope this helps
Regards Richard
AnswerID:
224471