Charge controller distance
Hi, Im getting ready to install my set up. 200w on MH roof and 40a mppt so I can add a 3rd panel later. I have a couple questions. How far can I mount my mppt from my batteries. Im sure shorter is bet...
Forum Discussion
champdog wrote:
200w on MH roof and 40a mppt so I can add a 3rd panel later. I have a couple questions. How far can I mount my mppt from my batteries.
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Ideal inside the motor home would put it a 12ft to 14ft of wire run from the batteries.
Depends on the gauge of cable from MPPT to batteries.
200W will generate less than 15A post-controller at peak sun.
Voltage drop calculator
Enter 12.6V, 15A, Copper, Conduit, 2% drop, 14ft. You need #6 cable.
If you add the 3rd panel, you need #4 cable to stay within 2% drop at 14ft.
With a better controller I wouldn't worry (too much) about 2% since it would have a voltage sense wires, but I have a feeling that yours is not one of those.
