Battery run time on Mt Vernon AE

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Harvey Schneider

Minister of Fire
Oct 9, 2012
1,321
Southbury, CT
The storm has come and gone and we just got power back. That's a pleasant surprise, CL&P was saying that we were unlikely to get power until Sunday.
During the power outage My Mt Vernon AE was running on a 100Ah backup battery. First I have to say the automatic switchover to battery was flawless. The stove was in automatic mode when we lost power on Monday. I changed the heat output setting to -4 ( on a scale of -5, 0, +5) The stove maintained the burn until the next morning at about 7 when the room temperature exceeded the thermostat set point and the stove decided that it was a good time to do a clean cycle. The daytime temperature was mild so l left the stove shutdown
Evening temperature were getting down around 40 degrees so in the evening at about 6 I started the stove manually. Now I have to say that as much as I love my Mt Vernon, the manual start procedure sucks. It makes you wait while it dribbles about a half cup of pellets into the fire pot and then it tells you to light the fire. If you close the door before the fire is really getting hot, the stove does a shutdown and dumps your fire into the ash pan. I won't do that again. I also learned that fire starting gel in a warm fire pot can be somewhat explosive. It didn't go boom, it just went poof. I won't do that again. Once started everything went smoothly. I put the stove on manual mode and set the heat output to medium high. In about a half hour the living room was 70 degrees and the stove maintained the burn at a low level all through the night.
Wednesday was a repeat of tuesday and I was beginning to worry about battery charge.
Thursday more routine until the power returned about an hour ago.
My battery charger indicates that the battery was down to about 25% of capacity after about 45 hours of run time. Now don't try to catch me on the math, all times are approximations. I am an engineer, but I'm not that OCD.
It is quite a difference from last year when we had the freak snow storm. Outside temperatures were a little colder but last year without a pellet stove the inside temperature were about the same as the outside temperatures. This year it was a comfortable 70 degrees inside.
The Mt Vernon AE performed beautifully even with its strange manual start procedure.
 
CL&P is getting some help, 37 line crews, equipment and support people were dispatched from three Maine utilities today. Just normal outages currently in all Maine service areas. I don't know if any of the New Brunswick crews were heading that way or not Massachusetts is also getting there. Last fall some of the crews hit a number of states before they got back home.
 
That's amazing how long they can run on battery power. I need to look into something like that. I do have a really small generator.

Green Bay WI just dispatched some line crews headed towards CT also yesterday.
 
That was the only thing I was looking forward to with regard to Sandy. We lost power for a day but it was so warm outside that we never needed the pellet stove. I had my 100 Ah battery charged and ready to go. I bought the battery backup cord the week before Sandy and I was looking forward to testing the battery back up system but I didn't get a chance. I think I will run it some weekend when I am home just to test it, but your report is definately encouraging. I was wondering what kind of runtime I would get and from the sounds of your report it will be much longer than I anticipated
 
Last year I ran my mount Vernon on a deep cycle battery during the October storm. It went like 10 hours and I did find it hard to get going.
 
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Harvey,
Was this a package unit or did you build (batt, inv, etc)?
 
It went like 10 hours and I did find it hard to get going.
What battery size did you have and was the battery in good condition and charged. I measured the current draw on the AE and it was only 1.5A on a 100Ah battery I would expect about 50 hours. Mine was doing even better than that.
 
Was this a package unit or did you build (batt, inv, etc)?
The Mt Vernon has a direct 12V battery hookup. No inverter needed. The optional 12V cable was overpriced but I couldn't figure out where to get the connector they used so I paid their price. One simply has to put the alligator clips on to the battery terminals and the stove will automatically switch to battery operation if the power fails. I have a separate charger and a battery tender that I use to keep the battery in good condition when it isn't running the stove.
 
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The battery still had juice, the problem was that after the 10 hours in the morning it went into a cleaning mode and the fire went out. I thought when it's on battery power it won't go into the clean mode. At that point I bought a generator and didn't have to use the battery.

It did keep me warm that first night without power.
 
The battery still had juice, the problem was that after the 10 hours in the morning it went into a cleaning mode and the fire went out.
Sounds like you might have been in automatic mode. In auto when the thermostat is satisfied the stove wants to clean.
Even in manual it will eventually decide it needs to do a clean. I don't know what the criteria is for that but it did it to me at 10am so I just re-lighted the stove.
 
Can I have both my battery tender and the stove both hooked up to the battery at the same time???
Maintain the battery when not in use and stove switch to battery when needed..
 
Well, my disclaimer is that you should check with a qualified electrician, which I am not. That said, you should be fine, in my opinion. The tender is just supplying a trickle of 12v power to keep the batteries topped off, which is the same as the battery's normal voltage, at very low amperage. However... The MVAE will not just keep running on battery power. You will need to manually restart it every few hours, as the ignitor does not work on battery power, and the stove will still autoclean, although less frequently. Also... It will take days and days to recharge the battery with just a battery tender. You will thus need some other charging source, such as a generator, to power the stove for more than about overnight (perhaps a generator for recharging those batteries as welll).
 
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Yeah those tenders are one amp or less. Won't even keep up with the stove when it is running. And make sure it is a good tender. The cheap ones are notorious for catching fire when they have to try to run too hard to charge a battery. Which they can't do.

They are fine for keeping a charged battery topped off. That is it.
 
It was a long time ago, but I thought I ran mine on battery and it shut down after 6 hours to auto-clean. This was on corn setting, med. high. Don't quote me. Mind isn't what it used to be. kap
 
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Can I have both my battery tender and the stove both hooked up to the battery at the same time???
Maintain the battery when not in use and stove switch to battery when needed..
I keep the battery connected to both the stove and the battery tender all the time.
It is a good idea to pull the AC from the stove every once in a while and exercise the battery. Batteries that sit fully charged all the time, without any discharge cycles, lose capacity. I am looking into adding a battery desulphator to prevent battery degradation, but I am concerned that the stove won't like the transient pulses that generates. I may have to add an in-line filter between the battery and the stove if I do.
On a 100Ahr battery I was able to keep the house warm during a three day power failure. I had to relight the stove a few times when it decided that it needed an autoclean, but we were warm without AC power. The battery still had more life in it, but CL&P (our local power utility) finally got the power back on.
If you are concerned about autocleans in the middle of the night, force a shutdown and manual restart just before you go to bed.
 
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