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Here's my challenge to all of you that want to design for 1% or 1.5%
voltage drop all the time: Take a 50-ft circuit carrying 40 amps at 12 volts, going to a C40 charge controller, select your wire size for 1% or 1.5% loss. You know that's not a practical solution. I know that it makes more sense to replace the charge controller and run the PV circuit at a higher voltage. At % loss did it become impractical? Ray's answer and my answer is "when there is a cheaper alternative -- lower cost per watt out or lower cost per kWh over the project life." And that answer works even when you are considering a 400-kW PV array that is 1000 feet away. Kent Osterberg Blue Mountain Solar, Inc. |
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