Jumper for Batterys in Series
While helping a friend I noticed this,the jumper between the 2 batteries is much smaller than the ones for neg. and positive .Shouldn't they all be the same? Click For Full-Size Image.
Forum Discussion
bpounds wrote:
Instead of comparing the series jumper size to the primary cables size, consider the cable size needed to handle the maximum current draw. The primary cables in the OP's pic are oversized for some reason. Not sure why, but there is no reason why the jumper has to match those.
The reason for oversize wire is to reduce the voltage drop, thus getting more of the voltage the converter produces in bulk mode to the battery.
#6 wire would handle the current but would have a large voltage drop at 60A. With 20' of wire, ground and positive, and a bulk voltage of 14.4v the voltage at the end would be 13.93v, not counting losses due to connectors, fuses, etc. With #2 wire the voltage would be 14.21v. Not a huge difference but enough to slow the charging time considerably.
