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Old 07-27-2008, 05:21 AM   #31
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Wiring Size Calculations?


It's 6 AM, so I can't guarantee these numbers, but, for a max of 5% voltage drop:

From turbine, going 1000' to invertor, ~#2 AWG. Using #8 will starve the battery charger circuitry and you won't get anywhere near the battery performance you should be getting.
The DC voltage into the invertor is probably below the spec value for this device. I hope it has not been damaged.

From invertor and going 1400' to load, ~#0 AWG.

At this point, I can't see cable heating [due to the current passing through it] as a problem.

Since you're not paying PoCo for kwh, I don't think there is a payback period for the money you spend on this equipment.

You've already bought the batteries so I'd put the next few dollars into the 1000' cable. The first priority is not abusing the equipment.

Or, we put the invertor/batteries next to the turbine and figure out how to ship 2500w over 2400'. Step-up/step-down transformers are starting to look good.

If you can supply me some prices for copper and aluminum cables, we can trade off the money you will spend for the performance you will get, and show this as dollars per watt or dollars per watt-hour.

You're a paying customer, so see if the turbine people will give you whatever technical data, schematics, application notes, everything on the generator that is driven by the turbine.
I'm especially interested in whether it is a DC gen or an AC gen with rectifiers.
And the voltage vs. current curve(s) for this gen would be good.

:-)



Last edited by Yoyizit; 07-27-2008 at 04:16 PM. Reason: added copper and aluminum
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