Battery Cable length/resistance?
As several of you know I am putting together 4ea., 6 volt batteries, a 600 watt inverter and a PD9270 on my 5er. I have read that it is very important to make sure that the battery connect for pos. an...
Forum Discussion
Last story I heard was that the amps getting to the battery from the charger or the draw from the batteries from the load depended on the Resistance in the wires.
The neg path has an R and the Pos path has its own R. The R that matters is the total R of the pos and neg paths. The two Rs do not have to be equal in any way. You can "improve" your set-up by reducing the R in either the neg or pos path or do some of each.
BUT, when discussing balancing battery bank linkages to try and get an even draw from each battery under a load or to get the batteries to share a charge equally, that is a whole different game.
And you need to ensure the links are short and fat enough to handle their share of the total amps the bank is either accepting or delivering.
If you need one link to be longer when you would like them to be equal gauge and length, you can make the longer one fatter in an attempt to even them up for R.
You can way over-do this. Say your microwave causes the inverter to draw 150 amps from the battery bank. Say your bank is two pairs of 6s in parallel and you have your inverter pos on one pair and the inverter neg on the other pair as is proper. So you would expect each pair to do about 75 amps of that load.
#4 AWG is good for 100 amps in short lengths. That 75 is less than 100 so you could use #4 for the battery bank links but need fatter for the inverter to battery bank wires, since they will be doing all 150 amps.
Clear as mud? :)
The neg path has an R and the Pos path has its own R. The R that matters is the total R of the pos and neg paths. The two Rs do not have to be equal in any way. You can "improve" your set-up by reducing the R in either the neg or pos path or do some of each.
BUT, when discussing balancing battery bank linkages to try and get an even draw from each battery under a load or to get the batteries to share a charge equally, that is a whole different game.
And you need to ensure the links are short and fat enough to handle their share of the total amps the bank is either accepting or delivering.
If you need one link to be longer when you would like them to be equal gauge and length, you can make the longer one fatter in an attempt to even them up for R.
You can way over-do this. Say your microwave causes the inverter to draw 150 amps from the battery bank. Say your bank is two pairs of 6s in parallel and you have your inverter pos on one pair and the inverter neg on the other pair as is proper. So you would expect each pair to do about 75 amps of that load.
#4 AWG is good for 100 amps in short lengths. That 75 is less than 100 so you could use #4 for the battery bank links but need fatter for the inverter to battery bank wires, since they will be doing all 150 amps.
Clear as mud? :)
