Inverter - Pure sine wave energy signal


Old 02-16-15, 04:35 AM
bust7015's Avatar
Thread Starter
Join Date: Jul 2001
Location: Connecticut
Posts: 110
Question Inverter - Pure sine wave energy signal

I have a propane fired boiler that requires a pure sine wave energy signal. Very efficient unit but worthless when I lose power. It won't fire when the house is running on my portable generator. Question is, is there an AC to AC inverter for this purpose? I have only been able to find DC to AC units for this. I want to keep this simple for my family. They have enough issues pulling out the portable and plugging it into the house when I am not home.
Sponsored Links
Old 02-16-15, 05:30 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,968
You don't invert AC to AC. However, although expensive, you could possibly install a "power conditioner" in line. Do research on it first by googling it and seeing what is out there and if it will apply to your situation.
Old 02-16-15, 05:47 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,753
Another option is to use a decent quality 12 volt DC to 120 volt AC inverter.
I use a Zantrex on my sump pump that runs on 120 volts with normal power then switches to battery in a power failure.
These units are approved for permanent wiring and would work on your furnace.
Your generator could charge the inverter battery during an extended power failure.........

I got the 1000 watt model for $150.00 on sale.
Old 02-16-15, 07:33 AM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 12,284
If you follow Greg's thoughts you can install a battery charger to the 12 volt battery and connect that to your generator. This will keep you up and running for as long as the generator is running. Depending on your boilers load you may only need to run it every so often to charge the battery. You could even charge it with solar or wind power.

So the connection line would be:

Generator----> Battery charger----> 12 volt battery----> Inverter---->Boiler

Another option would be to buy a generator that puts out a pure sine wave. I believe Honda makes one but they are about $1000
Old 02-16-15, 07:47 AM
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,515
A good off-the-shelf option would be to get a computer uninterruptible power supply (UPS) that has automatic voltage regulation (AVR) and pure sine wave output. It will take the relatively dirty power from the line or the generator and convert it to a very clean signal for the boiler. There are UPS models that can be hardwired into the boiler circuit.
Old 02-17-15, 04:15 AM
bust7015's Avatar
Thread Starter
Join Date: Jul 2001
Location: Connecticut
Posts: 110
Thank you for your input. I have to figure out what the initial wattage is for my boiler and go from there. I want to keep this as simple as possible and would like to avoid batteries.
Old 02-17-15, 06:42 AM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 33,052
You could power the inverter from a DC power supply with no battery if the DC power supply was large enough. It might even be cheaper then a battery charger (which is basically a DC power supply) and battery.
Old 02-17-15, 12:19 PM
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 18,399
How is the generator connected to the boiler? When on generator power does absolutely nothing happen when there is a "call for heat" or does the boiler initially fire and then the fire goes out within a few seconds?

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes