Not much info available on the "PWM Sinewave" output of the tripplite UPS unit in your first link. I'm guessing it's a modified sinewave much like most lower cost inverters and wouldn't take the chance on it to run an AC pump like the Blowhole. Could get costly having to replace your return pump. Having said that, have you considered one of the DC voltage return pumps that are slowly making their way into our hobby? For the price of one of those and a sensing relay plugged into an AC outlet, you could DIY something that would work pretty much the same way as the costly UPS. This would require a bit of knowledge as to how to wire the relay to switch to battery power when your AC power fails.
The other two units (pure sine wave inverters) look good for running your Blowhole pump, but pretty costly as well. But it appears they also have a 'transfer' switch feature which will make them plug & play.
If you experience power outages that often in your area, you might wish to consider investing in some 'off the grid' technology such as solar panels, wind generator, micro hydro if you have a creek nearby etc.. Initial investment is costly though & definitely some diy involved if you wish to save some money. Or bite the bullet & get a Generac natural gas whole house unit. There are some smaller ones available these days and they will automatically kick in & run most of the essentials in your home during an extended outage.
|