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Re: (ET) Power Inverters
Here's a suggestion that would work for me, since I have these parts "in stock" in my basement. You might, too?
1. grab one of the DC-DC converters you have on the shelves... (I have a NewMar that can deliver 6A at 12v from 36-60VDC, that was $50 on eBay)
2. use that to deliver "12v" (really about 13.6v or whatever) charging to a conventional lead-acid
3. use a 12v inverter off the lead acid (a power buffer in this case) to deliver 110VAC to your furnace as if the household current were available
a 12VDC to 110VAC inverter for your purposes needs to deliver about 1300W continuous, and those aren't *TOO* expensive. The one catch might be the start-up surge for the blower motor... different inverters behave differently, there. You can play tricks ramping up the voltage to the motor depending on the type.
The 6A at 12VDC, a feeble 72W before losses, to the battery is not enough to run the system continuously. The blower's duty cycle would make or break it... oof... only 1/10th even before losses... not so good.
Ok, I guess this is only an ok idea at best. But it is feasible, I guess.
The fan is the killer... maybe have a DC fan back-up? An ElecTrak or other 36v motor as a seconday blower... to run right off the tractor?
The only reason this idea works for me is that it's mostly off-the-shelf stuff.
-M
On 12/11/07, Bill Alburty <willaim kc rr com> wrote:
Every winter, when there is an impending ice storm, I begin to wonder if
there is a way to use the 36 VDC power source of my ET battery pack to
operate my gas furnace for a day or two, since the gas is still
available. Those of you who have used ET power inverters for this
purpose could tell us how much wattage you can get from fully charged ET
batteries, and for how long. It would have to supply about 11 AC amps at
115 VAC/60 Hz to run the blower and gas valve. At a reduced
house-thermostat setting, it seems to me that maybe enough heat could be
circulated to get through two day's power outage.
Is there a good simple design out there for making a 60 Hz inverter?
Does anyone know if the 24 VAC furnace gas valve will operate on DC?
Bill Alburty
E-12
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