To connect solar panels in series you just plug the positive connector of a PV module into the negative connector of the next module. At the end of the string, you plug the negative connector of the first module with the positive connector of the last one to the inverter.
The solar cable should only be joined by MC-4 connectors, and the solar cable ends must be crimped to the correct size terminal connectors using a hydraulic crimping tool and zinc-based antioxidant paste on the cable end before crimping. A heat shrink sleeve should be fused over the connection.
Strip the protective sleeve from both cable ends, allowing a sufficient length to fit halfway into the copper cable connector. Insert the exposed stranded copper solar wire halfway into one end of the cable connector and securely crimp the cable connector over the wire end.
It has been proven that a properly crimped MC-4 connection is superior to a soldered connection. The solar cable connection must be: Solar cables and connections to the solar panel array need to withstand the onslaught of nature for a minimum of thirty years, the expected lifetime of the solar panels.
MC3 One of the most popular solar panel connectors used in the past is MC3. The connector has male and female leads that work with positive and negative leads to complete the connection. Thanks to the flexible seal, they are weatherproof and keep the connection stable.
Solar panels do not always come with the solar connector attached. Attaching a solar panel connector to a PV wire is a two-step process: (1) crimping and (2) tightening the connector, to do this you require a wire stripper, crimping tool, and a solar panel connector assembly tool.