Cheng USA T30 T-30 30Amp Transfer Switch

When I turn my inverter on it automatically switches to solar power. When I turn the inverter off (or it shuts down due to low battery or whatever) it switches back to grid power. It has worked flawlessly for over a year. However it is NOT an uninterruptable power supply. It takes a fraction of a second to switch and this will cause electronics to reset and the lights will flicker when it shifts. It has shifted my power (average load about 350 watts) almost every day for a year with no problems. Highly recommended.

This switch is made to switch between shore power and the onboard generator seamlessly and safely. I used it to switch between shore power and a 2000 watt inverter, and it works seamlessly. As the inverter comes online and up to power the unit rolls over to that source without ever having both sources connected at once. This is important, since shore power can ruin an inverter.

Hooked this up in my RV to separate the shore/portable generator side from the invertor side. Switches over nicely as intended and hasn't skipped a beat. Solidly built, rather rugged and while I haven't had it all that long, I would believe it would last quite awhile based on how it is built.

Works as described. Switches good. Easy to install.

Buying this was inspired when we arrived at a campground in a heavy rain. Getting out to connect to the Pedestal was not a fun experience. It would have been nice to just start the Generator and wait for the rain to stop. Installation ABSOLUTELY Requires RV Electrical Experience and Skill. Not for the inexperienced. It also requires a LOT Of Planning for the DIY Types. Do NOT Attempt without a great electrical skill set. For those who are skilled this is a great project in the “off-season” (when is that)… Now when we boondock I do not need to get out and plug into the generator. So much easier for me now.

Easy to install if you know what you're doing. If you don't, hire an electrician. I used this to automatically transfer my RV's 120v electrical source from internal generator power to external utility power, which is its intended use. It works as it should. Good product.

If you have a WFCO load center in your RV, without making your own, this is the only game in town. That said it does feature a high quality transfer mechanism and the control board does allow option bypass for the 30 second cut over (ie generator stabilization period) if using another source such as an inverter. Plan your installation to permit easy replacement. This is not the case for me due to the location of my load center (near the ceiling above the reefer). Mind the hands while handling; there are some sharp edges that could be better finished. My theory on failure is it needs heat sinks and/or fans. It gets really hot in my installation location as well…

I liked the price. All this stuff is from China anyway such that it's a crapshoot if the one you install is better than the one that failed which is also a Chinese import. I laud the uniformity. The only departure was the grommets but they're interchangeable/replaceable. The ad picture tells the story. If it doesn't match exactly look elsewhere. Mind the box, however. Cut sheet metal can be dangerous especially when repacking the wires. Wear gloves and keep the bandaids handy. Cheers!