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Similar to Max'x idea (continuous charger for the
12 battery):
I use an old Heavy duty UPS - 3.1KVA.
It is 48 V powered (so I connect it to my
Comuta-Car when I expect a snow storm - power outage.)
But normally, it has plenty of power to start small
motors, and has a wonderful circuit to charge and maintain the 4 batteries,
AND, it has communications: can talk to a PC - tell
you the power draw, batery status, run time at present rate of draw,
etc.
AND, it has power filtering and surge suppression
built in, so what ever you plug into it when the AC line power is 'normal' is
also cleaned up.
And, it puts out SINE wave, not MODIFIED Sine wave
- so you can run anything 120 VAC off it.
I have other sizes of UPS also - 12V, 18v, 24V
& 60 V battery packs.
Sadly, no 36 volt pack powered units.
----- Original Message -----
Sent: Tuesday, December 11, 2007 10:58
AM
Subject: 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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