I'm trying to figure out whether I can connect an inverter directly to the batteries in my RV to power some AC circuits while it's on battery. My RV doesn't run any AC circuits on battery power, so this seems like a potential solution. Before I try it, I want to make sure I don't accidentally create a dangerous feedback loop. Here are the things I'm considering: 1) I have a suitably large inverter for my needs. 2) The wiring can handle the load. 3) The battery capacity (AH) is enough. 4) I won't be powering high-draw appliances like an air conditioner or microwave. Can someone tell me if I need to be worried about any issues, especially with the battery charging system since the shore power will also be plugged into the inverter?
3 Answers
It might be wise to install a transfer switch between the shore power and your load center. This way, you can selectively power your devices with either the inverter or shore power without risking a feedback loop.
You do have to be cautious of a potential energy waste loop. If you're charging at 200W while using 250W, that can drain your batteries faster than you'd like. It's definitely a good idea to add a disconnect for your battery charger to prevent this.
Most RV setups have the converter on a separate breaker, so you should be fine with that setup.
Make sure to fuse the battery properly and ensure it has enough capacity. And like others mentioned, turning off the converter will help avoid any power loops when using the inverter.
If your RV is set up similarly to mine, the shore power plug acts as a transfer switch. You can connect to the shore power, generator, or inverter without needing an extra switch. I avoided feedback issues by using separate batteries for my inverter.