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Old 06-10-2012, 04:09 PM   #16
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Emergency 120v Battery Backup Power Supply


Let me get this straight, the only thing the back up would be powering is the igniter and a small digital display on natural gas on demand hot water heater and stove top igniter.

I'm not a professional., But I did stay at Holiday Inn Express last night.

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Old 06-10-2012, 04:26 PM   #17
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Emergency 120v Battery Backup Power Supply


Ohh ok so it's a gas water heater? Then yeah a UPS could work to power the electronics and power vent fan if any.

Use an amp meter to find out how many amps the devices use, times by the voltage (120 or 240) and that will give you about how many watts it uses. Divide this by the DC voltage of whatever UPS you'll use, then divide the amp hours of the battery by this value. Will give you a rough estimate of how long you'll have. You can probably times by 0.8 to get a more accurate number as it will always be lower.
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Old 06-10-2012, 06:44 PM   #18
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Emergency 120v Battery Backup Power Supply


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Originally Posted by jburd964 View Post
I have several appliances, stove, hot water heater, telephone, that could be used in a power outage with a small 120 volt back up battery supply. Does anyone have any experiences with something like this? What would be the best way to approach this? What would be the best type of self charging supply? Let me get this straight, the only thing the back up would be powering is the igniter and a small digital display on natural gas on demand hot water heater and stove top igniter.
So it took 16 posts for yo to realize that you didn't give us all the information that we needed to give you an accurate answer?

Your initial post illuded to you have all electric devices....only now do we find out your stove is gas and you 'on demand' water heater is gas...with electric controls.....that information up front would have saved a lot of time.

Ok...stove...you don't need electric for it...just use one of those hand ignighters...

For the gas water heater....use an extension cord.

A UPS for those devices is not a big deal....your big issue is how you segregate them from your house power. If your willing to run separate circuits from those devices to the UPS....yea...it would work.

TBH....not sure why you are worried aobut taking a shower during a power outage.....I would be more worried about the fridge....
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Old 06-10-2012, 06:58 PM   #19
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Emergency 120v Battery Backup Power Supply


I guess I can see the concern since it's on demand so as soon as it stops, the hot water is no longer hot, unlike a tank. Sucks if you're in the middle of a shower and the power goes out.

What I'd do is add a dedicated UPS for that one, I'm guessing it's wired straight into the panel, so what you'd have to do is change it so there is a power outlet near it, and add a plug to it. So plug the UPS in the outlet and the heater in the UPS. If it's only powering a gas valve and a few electronics, it probably does not use much power so you may actually get a good 30 minutes out of it. You're not going to be getting multiple hours unless you do a bigger setup like I did though. The only purpose would be to give you a chance to finish up your shower if you happen to be taking one and the power goes out.
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Old 03-29-2013, 03:45 AM   #20
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Emergency 120v Battery Backup Power Supply


Hello i would like to know what kind of ups you are useing for the build you have? I need something that can power a 220 watt fan 1.9 amps 60 hz for about 5 hrs would your setup be able to handle that? also i'm not great with all this electrical stuff i am a car mechanic and can install typical house electrical repairs but not familiar with ups systems can you help me out? Thanks

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