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Old 11-24-2009, 08:23 PM   #15
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Does everyone run their electric or oil filled heaters off of generator power? All night? I've been thinking about a small Vornado myself. However I don't have a generator...just solar power.

Could I run this from a separate 125 amp/hr battery, on low (400 watt) with a portable 800 watt inverter? How long would my battery last do you think?
We use a catalytic heater in our trailer. It doesn't use any electricity, only LP. We do have an oil-filled radiator for use when hooked up to 120 volts, and we don't have to pay extra for the electric.
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Old 11-24-2009, 08:44 PM   #16
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I just bought the Vornado DVTH Digital which is 750 or 1500 watts. We have 15 amps where we store and I wanted something with a thermostat I could run on the late fall nights that sometimes dip below freezing so I wouldn't have to winterzie early. Someone on the forums suggested this heater which would pull less power and still prevent pipes from freezing. There are many times we can head to the beach for a long weekend this time of year. We are going tomorrow in fact.
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Old 11-24-2009, 08:53 PM   #17
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Quiet Heater

Ditto on the Vornado...
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Old 11-24-2009, 10:45 PM   #18
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Quote:
Originally Posted by seeflash View Post
Does everyone run their electric or oil filled heaters off of generator power? All night? I've been thinking about a small Vornado myself. However I don't have a generator...just solar power.

Could I run this from a separate 125 amp/hr battery, on low (400 watt) with a portable 800 watt inverter? How long would my battery last do you think?

Hi, using a heater is usually at night, unless in really cold areas. [then I would run my heater 24 hours] So I would use my furnace if I didn't have shore power. I would use my furnace in freezeing weather. I use my oil filled heater in cool temps when I have hook-ups. I would not run my generator at night at all and running a generator for an electric heater would burn more fuel dollar for dollar than useing a propane furnace. I don't have actual experience with running a heater off of a battery system, but I'm sure it would drain your batteries very fast.
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Old 11-24-2009, 11:52 PM   #19
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Portable electric heater

Thanks for the information.

Doing the math, if you run a heater at 400 watts you only use 3.4 amps/hr (slightly more than a 20k BTU furnace) x 8 hrs. = 27.2 amps. Or 750 watts @ 8 hours = 50 amps. Recharging my battery with solar at 2 amps/hr all day should put back about 20 amps.

Seems that it may work, but I'm just not sure if my calculations are entirely correct. I would rather not use a catalytic heater as I mostly camp at high altitudes and am worried about oxygen depletion.

If anyone can shed some light on the subject matter I would be grateful.
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Old 11-24-2009, 11:54 PM   #20
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Originally Posted by seeflash View Post
Does everyone run their electric or oil filled heaters off of generator power? All night? I've been thinking about a small Vornado myself. However I don't have a generator...just solar power.

Could I run this from a separate 125 amp/hr battery, on low (400 watt) with a portable 800 watt inverter? How long would my battery last do you think?
It is much less expensive to burn the propane for your furnace than use a portable generator to run electric heat. The cost of electricity from a portable generator is in excess of $1.00 per KWH.


Your 400 watt electric heater draws roughly 40 amp hours per hour. It draws 10X amps at 12 volts compared to 120 volts. You may get an hour or two out of your 125 amp hour battery (not supposed to completely discharge battery).
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Old 11-25-2009, 08:09 AM   #21
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Quote:
Originally Posted by seeflash View Post
Does everyone run their electric or oil filled heaters off of generator power? All night? I've been thinking about a small Vornado myself. However I don't have a generator...just solar power.

Could I run this from a separate 125 amp/hr battery, on low (400 watt) with a portable 800 watt inverter? How long would my battery last do you think?
400 watts / 120 volts = 3.3 amps
Plus you have the inverter that uses power, so let's say 5 amps.
The battery should not be drained more them 50%, so you have 62.5 usable amp hours of battery.
62.5 amp hours / 5 amp draw = 12.5 hours

These are rough numbers and are based on a fully charged battery when you start.
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Old 11-25-2009, 10:49 AM   #22
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400 watts / 120 volts = 3.3 amps
Plus you have the inverter that uses power, so let's say 5 amps.
The battery should not be drained more them 50%, so you have 62.5 usable amp hours of battery.
62.5 amp hours / 5 amp draw = 12.5 hours

These are rough numbers and are based on a fully charged battery when you start.

You forgot to make the 120 to 12 volt conversion on the amps. If it draws 3.3 amps at 120 volts, the inverter will draw at least 33 amps at 12 volts. With conversion inefficiency, it will be closer to 40 amps at 12 volts.
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Old 11-25-2009, 11:12 AM   #23
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Anne;

some time ago I did a thread-- Heaters, heaters, heaters. You will find detailed info of different heaters. I would link it but I don't know how.
The oil heaters sound like the way to go for you, totally safe to leave on all night whilst sleeping, and there are models with built in timers. So if you are away in the day you could have a nice warm place to get home to.
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Old 11-25-2009, 09:35 PM   #24
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Anne;

some time ago I did a thread-- Heaters, heaters, heaters.
Here you go...

http://www.airforums.com/forums/f427...ers-29283.html
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Old 11-26-2009, 12:02 AM   #25
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I just read the full thread the other day and that's what prompted me to ask the question. So, what is correct? Both sound logical.

My flat panel TV runs at 400 watts, plugged it into the inverter and ran it for 2.5 hr. movie with only .1 volt drop as I still had 12.7 volts in the morning.

More info. is welcome.
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Old 11-26-2009, 12:36 AM   #26
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Found this searching the web: thanks to all for the help.

One of the biggest mistakes made by those just starting out is not understanding the relationship between amps and amp-hour requirements of 120 volt AC items versus the effects on their DC low voltage batteries. For example, say you have a 24 volt nominal system powering a load of 3 amps, 120VAC, which has a duty cycle of 4 hours per day. You would have a 12 amp hour load (3A X 4 hrs=12 ah). However, in order to determine the true drain on your batteries you have to divide your nominal battery voltage (24v) into the voltage of the load (120v), which is 5, and then multiply this times your amp hours (12 ah). So in this case the calculation would be 60 amp hours drained from your batteries - not the 12 ah. The easiest way to quickly determine the total battery amp hours required is to first determine total watt-hours required by all loads, and then divide by the nominal DC system voltage. This resulting number will indicate the amount of amp hours needed to operate all loads for a given period. However, additional amp hour capacity would typically be added for more "reserve" capacity or to prevent complete discharge. Using the above example, 3 amps x 120 VAC x 4 hours = 1440 watt-hours divided by 24 VDC battery environment equals 60 amp-hours; the same answer as before, but another way to get it.
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Old 11-30-2009, 02:30 PM   #27
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We now use a Vornado VH-2 heater
I wonder how this smaller version would work

Vornado

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Old 11-30-2009, 02:49 PM   #28
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I wonder how this smaller version would work

Vornado

Don
That one doesn't appear to have a thermostat. Or at least not one that you can set to a specific temp.
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