Then connect the solar panels to the charge controller like normal. Step 4: Connect the Solar Panels to the Solar Charge ControllerĬonnect the charge controller to the battery, if you haven’t already. You can string together as many panels as you want like this. Just connect the positive cable of the third solar panel to the negative cable of your 2-panel string. Want to wire 3 or more solar panels in series?Įasy. That’s in the ballpark of 45.2 V, so I know my 2 panels are properly connected in series. Indeed, when I took it outside and measured its open circuit voltage, I got a reading of 38.7 V (a little low because the panels were in full shade for photo-taking reasons). So I expect the open circuit voltage of the 2-panel string to be close to this. It should be close to the sum of the 2 panels’ open circuit voltages.įor instance, each of my panels has an open circuit voltage of 22.6 V. If you want, you can confirm they’re correctly wired in series by taking the panels outside and using a multimeter to measure the string’s open circuit voltage. Your two solar panels are now wired in series. Step 3: Connect the Positive Cable of the First Solar Panel to the Negative Cable of the Second Stops the solar panels from generating power while we’re working with them.Place them face down on the ground, on top of a blanket or towel to protect the panel glass. Tip: If you’re worried about forgetting which cables are which, mark the positive cable on each panel with some tape. If the voltage is negative, the positive probe is touching the negative cable. If the voltage is positive, the positive multimeter probe is touching the positive cable. If your panels give no indication which cables are which, use a multimeter to measure each panel’s open circuit voltage (Voc). If yours don’t, there may also be small plus and minus signs on the MC4 connectors or the junction box. For instance, my solar panels both had plus and minus tags attached to the positive and negative cables. The easiest way is to look at the cables themselves and see if they’re already marked. There are two ways to identify the positive and negative cables on your solar panels. Step 1: Identify the Positive and Negative Cables on the Solar Panels If the solar panels are not identical, they should have the same current rating.It is recommended that you use identical solar panels.The differences between series vs parallel wiring.This tutorial contains step-by-step instructions on wiring solar panels in series and parallel.
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