I was sold on the EcoFlow—might even get the larger one for whole-house backup. For $1100, the EF3+ with an extra battery is a solid deal today. The H2D only briefly spikes above 1500 watts, and mine only does that for about a minute, which is just long enough to trigger my CyberPower’s shutdown. Also, there’s no way to silence the alarm, even after turning it off in settings.
The EcoFlow should work fine as a UPS for the H2D, which draws around 1600 watts. Its 1800-watt limit is usually enough, and while some users push it higher, that may not work consistently with the H2D. There’s a lot of misinformation out there, but staying plugged in won’t hurt it. You can limit the input power—set it to 100 watts and let it slow charge. Let’s be honest, most of us won’t still be using these in 10 years when portable fusion cells are the norm.
Most high-wattage CyberPower and APC units (1980 watts and up) need a 20-amp breaker—common in kitchens. Just check for a “20” on the breaker and look for a T-slot outlet (horizontal + vertical). The APC 2200VA, like this one, uses a 5-20P plug, though some versions come with a 5-15P. Some CyberPower units use a NEMA L5-30P, which needs a 30-amp breaker—not common at home but found in labs or garages.
I bought my 1500-watt CyberPower refurbished on eBay for $400 with batteries. You can also find used APC units without batteries and get replacements at Batteries Plus. It might run a bit more, but it’s worth it.
If you don’t want to install new breakers, just run a 10-gauge, 20-amp-rated extension cord to the room. I have them all over the house for mining. My wife even put Post-it notes next to certain outlets so she doesn’t accidentally trip a breaker.