I'm trying to upgrade my old breaker panel, and I'm contemplating adding solar panels to my setup. Currently, I have a 3-wire system coming from the meter, which includes two hot wires and a ground. Since my house was built in the 50s, it doesn't have ground rods either, but I'm planning to add those. I've got roughly 18 panels lined up with microinverters, and I want to know if I need to switch from a 3-wire to a 4-wire setup for the connection from the meter to the breaker box. Is keeping my 100 amp panel sufficient since I don't consume that much power?
2 Answers
Before diving into the wiring, it's vital to check if you need a separate neutral for your solar system. If your current setup is a 3-wire (two hots and a ground), you might want to consider upgrading to a 4-wire system to meet NEC requirements, especially with solar installations. This would typically enhance safety and compliance.
I get where you're coming from! Since your system bonds neutral and ground at the meter with the current 3 wire, it might work for now. But if you're adding solar, confirming with a local inspector or electrician could save you some hassle in the long run. Many people recommend going for the 4-wire to ensure safety and handling if you ever expand your setup.
Totally agree! It’s smart to check in with a professional, especially with older wiring. They can assess whether your current system can handle the added solar load without issues.
Right, you definitely want to make sure you’re up to code. If the solar inverter needs a separate neutral for proper grounding, switching to a 4-wire setup could be the way to go. Even if your panel seems fine now, it’s better to be safe!