Low voltage under load

[Volt_Ampere]

Normal voltages are rest voltages. The under load voltage will vary with state of charge and the internal impedance of the batteries and cables.

[b1reed]

Originally Posted by simple man

According to their site, his battery model is 170 amp hour rating (20hr rate).

This is correct, I was told to go with Trojan, Crown, or US and my local dealer happened to have the US's in stock and I got a decent deal on them. are they not up to the task of supplying my current setup?

TerryH
Thanks for the info, glad to hear im not alone and I haven't caused any harm to the batteries. As for my right foot, I think I suffer from the same thing most of us on here do, very heavy right foot of course!

Volt
State of charge would be close 100% from the charts I have seen. 50.8-50.9 24hours after taking the charger off. You lost me with impedance of the batteries but the cables are 2 gauge excelene welding cable with pressed on copper lugs

[Volt_Ampere]

Batteries have internal resistance (Impedance) and this causes a drop in voltage under load. The battery resistance and cable resistance add together to cause a voltage drop proportional to the current. The more amps you are drawing the more voltage is lost to resistance.

[b1reed]

Originally Posted by Volt_Ampere

Batteries have internal resistance (Impedance) and this causes a drop in voltage under load. The battery resistance and cable resistance add together to cause a voltage drop proportional to the current. The more amps you are drawing the more voltage is lost to resistance.

Thanks for the explanation volt, makes sense now! So I guess what I took from all this is its completely normal for voltages that low and will not cause any harm to the batteries. I would assume that if I had better batteries that could support the load better then I would see better performance due to the voltage not dropping off so far.

Thanks for the help everyone!
Brandon