DIY Offgrid Project – PV panels

I found 13 x 250 watt PV panels on Gumtree for $100 each. It turned out they came with mounting rails and most of the clamps. That’s about $500 of cost avoided! The panels all appear in perfect condition. That’s 3,250 watts of panels for 40 cents per watt. By the time I get them on the roof they will owe me nearly 60 cents per watt. That’s about 4 cents per kWh over ten years. Cheap power!

IMG_0833

The open circuit voltage of the panel, Voc is 37.6 so three in series is 113 volts which is less than 120.

There is an interesting loophole in the electrical safety rules. You don’t need to be a licensed electrician to install DC equipment that operates below 120 volts. Technically you don’t have to follow all the pesky safety rules around isolators, conduits, fuses and earthing. You know, all the SAFETY rules. I will be following those rules regardless. (You can find the rules online if your Google-foo is good. I don’t want to draw attention to them because hiding Standards behind paywalls is what we do in Australia: put up a fence and charge rent and if I link to the set I found they will probably be taken down.

More to come! Installing and wiring the panels is next.

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