Mike,
I've considered going the relay route to do my switching, and then having a separate battery charger and inverter, but the other half just started pointing to my tank and adding up a few corals, and then vetoed it. Since I travel for work, the other half wants a plug and play solution, just in case I have to do over the phone trouble shooting. Unfortunately the other half won't touch a multimeter, but I was allowed to cut holes in the wall, so I shouldn't complain.
The other two pumps that I would be putting on the UPS are DC pumps already, I only have 2 AC pumps in my entire 300 gallon system, so replacing the Blowhole is an option I've considered.
The power outages have gotten fewer the past few years, milder winters perhaps, but we have discussed a whole house unit before, and its been slated to be in the new construction we are building in 5 years, along with some alternate energy, depending on location.
This is more to keep my spouse happy, as my current job has me traveling more then my previous job, as I know my tank is okay for a few hours, as I already have a piston air pump on a computer UPS that I built a relay box to kick on when the power is out, just to circulate and aerate.
Thank you again, I was unsure if a PWM sine wave was square or a bit closer to a true wave form, but it appears, I'm just going to have to bite the bullet or rather cut in to my coral budget for the next month or two.
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