MC4 connector crimping best practices require a ratcheting crimp tool with 1,500-2,000 lbs force and hexagonal dies, a 6. 5 mm strip length, a 310 N minimum pull test, and a 3. This ensures that the current flows efficiently and safely from the photovoltaic modules to the inverter and can. The jaws of a certified crimper deliver tonnes of force – enough to make or break a 25-year solar installation. Whether you're connecting a single panel or an entire array to your charge controller, understanding how to properly assemble these connectors is essential. I'm Nate, and in lesson #7 of. I recently built a DIY solar generator, and I learned that the best way to crimp is to press the wires inserted into a male or female pin tightly to create a firm grip and contact.