Hey folks, I'm setting up a 15kW off-grid solar system and switched from an old 120V 100A charge controller to a new MPPT model that can charge at up to 120A. Unfortunately, I overlooked that the load terminal on this controller is capped at 40A and blew the fuse when I connected my inverter to it. Can I connect my inverter straight to the battery terminals instead? Is that the right and safe way to handle this? I'm looking for advice on how to correctly bypass the load port on the charge controller.
3 Answers
Typically, you'll want to connect the inverter directly to the battery terminals. Just make sure to add a fuse and set the voltage cut-off on the inverter. An alternative could be using the load output of your MPPT to manage inverter shutdown on low voltage, but it's not ideal to keep the inverter connected to the load output. That could lead to more issues down the line.
I learned this the hard way too! If anyone has wiring diagrams to share, that could be super helpful!
You're right; that's how this setup is usually done. I bet the charger manual advises against connecting the inverter to that load port. Better safe than sorry! Glad you figured it out.