Wiring For Our Solar Panels

New Wire
New Wire

Wiring was the most expensive part of our alternative energy system. The farther the panels (or turbine) are from the batteries and house, the more you need. We had purchased the various components needed by now, including the roof racks. Roof racks were needed to place them securely on the roof. We made sure to buy enough racks for future solar panels. The brand we purchased was Unirac, though the exact model we bought has probably been improved and changed since then. I will be honest though, it was very scary watching my husband climbing on top of our barn and installing the racks and later the panels. He had to do it alone with no assistance from anyone, because it is just the two of us here now.


Ditch For Wires
Ditch For Wires

Once the wire was bought, work began on the installation of it. A ditch had to be dug from the house to the barn, from the spot where it would come into the house. In the middle of this project, it had to be interrupted to do the work on the water system that would eventually bring it into the house. That will be a future post. At the house the wire then ran through the new room and into the root cellar to the circuit breaker box. The wire underground was strung through conduit to protect it from the elements and rodents. It was all set and ready to be connected in the barn.

Conduit for wiring

2/0 cable gave use the ability to transfer 12 volt DC power with virtually no loss, saving us the need to add a converter at the barn that changes it to AC and a converter at the house to change it back to DC. Each converter would use energy to convert it. This set up would allow us to have less components. AC is a smaller and cheaper wire. It is really a preference thing. Whichever you want to do is up to you.


Wired in the upstairs of the barn.

In the barn condit was fastened to the walls to enclose the wire. From the downstairs wall the wire goes upstairs and is connected to the combiner box (made by Midnight Solar). The circuit breakers are in this box and each panel has its own circuit breaker and are connected from the roof to it here. An AC wire is run to the barn from the house in the same conduit along with the DC wire. In the downstairs of the barn, the AC wire is wired to a light switch for a light downstairs. It runs upstairs also to be wired in to various wall plugs and light switches. A DC motion light was installed in the upstairs of the barn and works great. If you see that light on at night, you wonder what is going on up there. The equipment was purchased over time until we had all the parts needed to complete this project.

Wiring Downstairs In Barn
Wiring downstairs in the barn.

Finally the day arrived for the solar panels to be installed on the barn roof. Each one had to be carried up the ladder and mounted to the roof rack. Once in place their wires were plugged into the MC4 connectors. A wire runs from the panels to the combiner box. That completed the installation of moving our first five panels to the barn roof and the process of wiring them in. To add more panels now, the roof racks are all set for them to be mounted in. Should be easier.

Solar Panels on Barn Roof
Solar Panels on Barn Roof



Copyright © 2017 Kathleen G. Lupole
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7 Kathleen G. Lupole