Re: Battery Backup for Gas furnace (boiler)
I would say since you already have the batteries go ahead and use those. If in the future you decide to upgrade you can. Once we get the numbers from the kill-a-watt we can figure out how long those batteries might last with your system.
I would guess your boiler has a glow plug on startup? Or does it have a standing pilot? If it uses a glow plug you will see something like 300-600w for 20 or so seconds during start up. This will likely be the biggest load. I would also suggest a sine wave inverter if the unit has any kind of electronics on it, they sometimes work on mod sine, but there is a chance you could fry them as well, that would be bad. I am assuming its hot water since you didnít mention a forced air blower.
For a connection I would suggest making the boiler a male Edison plug-in (standard plug like you se on anything that plugs in). Then in a pinch you can just unplug it from the grid or wall outlet and plug it in to the inverter.
I would also suggest upping the size of the inverter to potentially allow a fridge or freezer to be run. If you have an outage in summer it would be quite handy although you could use your genset for that as well.
What the heck is the small standalone sine wave inverter everyone seems to like and last forever? The Prosine?
XW6048, 4 KC 120's, 4 KC 130's and 4 Evergreen 200's totaling 1800w of PV, MX-60 charge controller, Trimetric meter and eight AGM 8A8D's or 490 amps at 48v. 4 tons of geothermal and 3 tons of air source.