BFL13 wrote:
jrnymn7 wrote:
BFL13 wrote:
Not sure about #4 from the PM but try it and see. I use fatter than that #1 18" for the 100amper.
i meant to say i would change the 6ga to 2ga (not 4ga) from batts to shunt... i edited my post.
several charts, including the one trojan uses, say less than 5 feet of 4ga is plenty for 75a. i only went with 2ga from batts to inverter because i read somewhere not to "starve" the inverter into setting off its low voltage alarm too early.
before i split the bank, i think i might also try hooking the pm's neg directly to the batt... thus by-passing the shunt and that 6ga wire...i won't have an amps reading from the tri-metric, but i will know if the pm kicks into boost by the voltage.
Should work to check out the PM assuming the batts are low.
Besides the wire gauge there are the terminals and connections that can add R. Try and and see.
I can confirm that 15" of #4 each side is ok for a 55 amp charger/converter to do 61 amps, but longer gets you 58 amps and longer yet gets you 55 amps, etc. So with the 75amper #4 is borderline but it depends how long and how good the connections are.
You might be better off to go short #4 over to the inverter and share the fat #2 from there. Do what it takes in your set up, not what the theory is--that is just a starting point to see if it works.
i should probably mention, there was a 0.01 voltage drop across that 16" of 6ga wire when charging with the pm previously... not sure if that's an acceptable line loss? and if i remember correctly, there was the same line loss thru the 24" of 4ga between the pm's screw connectors and the shunt.
