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This page covers the layout and digging of the trench for the underground wiring from the meter/distribution panel location on the house to PV panel array out in the yard. The PV system we decided on uses Enphase micro-inverters mounted at each PV panel to convert the DC generated by the PV panel into grid compatible 240 volt AC. A set of underground wires then carries the 240VAC over to the distribution panel and meter location on the side of the house. This section covers laying out and digging the trench. On most grid tie systems, a single larger inverter is used, and it would typically be mounted on the house wall near the meter and distribution panel, or inside the house near the circuit breaker panel. In most cases, a "string" of PV panels would be wired in series with each other with a resulting voltage of two or three hundred DC volts for the full string. The output from the string of panels would then be run back to the house and the big inverter in a trench that is similar to the one we used. So, with either system you end up needing an underground wiring trench. In our case, the panels are a ways from the house, and by the time you avoid the buried propane tanks, the underground line ends up being about 90 ft long. The trench needs to be on the order of 2 ft deep, and our soil is hard digging, so I decided to rent a fairly big trench digger -- this was a good decision, and saved a lot of time.
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See the wiring section for the details on the actual wiring...
Next -- Installing the system components |
Gary November 21, 2009