Battery Back-Ups for Pellet Stoves

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If you are reading this post, you either own a pellet stove and have spent a couple of nights in the cold because you had no power. Or you are thinking of buying a pellet stove and you want to know how to avoid a cold night without your primary heat source. We will help you choose the right power inverter and battery to keep your space warm and toasty for the duration of the power outage.

With some research, I have found some valuable information about pellet stoves. Most pellet stoves plug directly into your standard wall outlet. They use about 1.0-1.3 AC amps per an hour. In general they have a start up usage of about 4 times there continuous usage, or between 4 -5 AC amps. We need these numbers to find out how much back up power we will need. You can find them in your owners manual, under the section usually called “Electrical Rating.”

Now that we have our basic set of amp usage, we should design a sample back up system. Which means we get to do some math, we will try and keep it simple.

The maximum AC amps we will need is 4, this start up amperage is for a standard sized pellet stove, one designed to heat up to 2500 sq ft. We need to convert this to watts, to do this we will multiply AC amps x 120 volts. We use 120 volts because this is the power of the outlet in your home.

4 AC amps x 120 vac = 480 watts

We now know that 480 watts is our maximum usage.

The stove will run at 1.1 AC amps continuously.

1.1 AC Amps x 120 vac = 132 watts

Ok now we have the numbers that we need to choose a power inverter.

I have some research and have discovered that some pellet stoves, require a pure sine inverter in order to operate. This is something you will have to ask your dealer before purchasing the stove. There are some pellet stoves that will operate off of a modified sine inverter, once again this is manufacturer specific. I will make a recommendation for a pure sine power inverter, because it will work on any pellet stove.

For this set-up I would recommend the AIMS 600 Watt Pure Sine Power Inverter. This inverter falls in to the range of maximum inverter efficiency. Some devices require a pure sine wave to work properly, most devices work more efficiently with a pure sine inverter. A pure sine inverter makes your device work more smoothly and can increase the lifespan of the device.

Now that we have an inverter we need to select our battery and charger. I am going to recommend our Lifeline 12 Volt Deep Cycle Marine AGM Battery. I am recommending this battery for a couple of reasons, first of which is power. This deep cycle marine battery has 105 amp hours and can handle many charge and discharge cycles, unlike an standard car battery. The second reason I recommend this battery is because it is an AGM or absorbent glass mat battery. This means there is no risk of the battery spilling or leaking inside your house. Also AGM batteries, do not need to be ventilated, because they do not emit dangerous gases, like many other types of batteries. These Lifeline AGM Batteries also charge 20% faster then a conventional vented battery or a gel cell battery. These batteries are essentially 100% maintenance free, no addition of water is needed. There are other types of deep cycle marine batteries, but this is the best for our application.

Next we need to select a charger, I recommend the Iota Smart Battery Charger/Converter. This charger is a 12 volt, 30 amp charger. It is also a “smart charger” which means it will charge your batteries quickly and keep them fully charged, without overcharging and damaging the battery.

Lastly you will need a transfer switch, we recommend our Iota 2 Way Automatic Transfer Switch 30 amp. This transfer switch is for inverters 3600 watts or less. This not necessary, but it does automate your back up system. Meaning that if your power goes out in the middle of the night, your back up will automatically keep your pellet stove running.

Lets take a moment and review which parts are included in our system now:

• AIMS 600 Watt Pure Sine Power Inverter

• Lifeline 12 Volt Deep Cycle Marine AGM Battery

• Iota Smart Battery Charger/Converter 12 Volt/30 Amp

• Iota 2 Way Automatic Transfer Switch 30 amp

I have another AIMS product that is a pure sine power inverter, charger and transfer switch in one unit. It is our AIMS 1500 Watt Pure Sine Power Inverter with Built in Transfer Switch & Charger. This product is designed for those who want to simplify their install. You will still need the battery mentioned above to use this device.

The last item you will need to install this system is cables. It is important to get the right cables, that way you get the maximum power from your back up system. Fro either on of these systems you could use a 4 AWG or larger cable, also known as a #4 gauge cable. I recommend that you follow the stove manufacturers instructions, when deciding where to place your battery. In general most manufacturers recommend the battery is at least 6 feet from the stove, in a battery box or ventilated cabinet. Keep in mind that you want to keep the inverter as close to the battery as possible, for maximum efficiency. If you are going to place the inverter more than 6 feet from the battery, we recommend you use a larger cable, to decrease bottlenecks, the size we recommend is 1/0 AWG. We sell both of these cables on our website To keep it simple you can just use a longer extension cord from the inverter or the transfer switch to the stove. This way you can keep the battery far from the stove and the inverter close to the battery.

I have included some simple layouts of how this system should be hooked up. Of course if you have more questions, please let us know we are happy to help.

The first layout is the system with the AIMS 1500 Watt Pure Sine Wave Inverter, Charger with built in Transfer Switch.

AIMS 1500 Watt Pure Sine Inverter Charger with Transfer Switch

AIMS 1500 Watt Pure Sine Inverter Charger with Transfer Switch

This second layout is for the system that we built up around the AIMS 600 Watt Pure Sine Power Inverter.

Inverter with seperate transfer switch and charger

Inverter with seperate transfer switch and charger

If you have any further questions about power inverters, cables or batteries. Please give us a call @ 888-417-8673. offers excellent customer support and we would be happy to answer any questions that you might have. We have a wide selection of pure sine wave and modified sine wave inverters and our goal is to make sure our customers are purchasing the right equipment the first time around.

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23 thoughts on “Battery Back-Ups for Pellet Stoves

    • Of course, you can add as many batteries as you want to a system like this.

      If you have questions about this please call us @ 888-417-8673

  1. So if i set my pelet stove to run with out the auto light feature, it will maintain itsetf at very low temp, using the batery you mention with 105 amp hours and the stove using approx 1.1 amps/hour then the stove would run for apprx 100hours? If that is correct I am very interested in you product. The cost of your AIMS 600 Watt Pure Sine Power Inverter per your web site is $479. The battery you mention is the 12 Volt Deep Cycle Marine AGM Battery for 299.00. So for approx $800 I could have battery back up for 4 days or so.

    • Dave,
      I believe the 1.1 amps you are speaking of are AC amps, the battery is quoted @ 105 dc amp hours. Your pellet stove is probably using closer to 11 dc amps an hour. So it should last somewhere between 8 to 10 hours, if you want to run the battery down low, the battery will last longer if you only discharge it 50% or so. If you want to talk about this further please call us @ 888-417-8673

      Also the 600 watt pure sine is on $189, the inverter for $479.00 is the 1500 watt pure sine with built in charger.

  2. What is the model number for the AGM battery that you recommend and is there a benefit to getting a battery with more AH? Maybe give us an example.

  3. We are very interested in this product, we would probably go with the 1500 watt pure sine with built in charger. Our question is, how long would it take to charge the battery and how would you do it, does it just plug into an electrical outlet when power is restored. My thought is that I would run the pellet stove in the night time, and charge during the day at a friends house who has a generator. Does this sound feasible?

    • Elizabeth,
      Yes you can do this, keep in mind batteries are heavy and are not easy to haul around daily. This inverter charge at 10 amps an hour.

  4. My husband and I recently had a pellet stove put in. After being without electricity for 6 days due to hurricane Irene, I realized that if the electricity were to go out, we would have no heat. I found a website that gave a list of the parts needed to make a battery backup power system for our pellet stove. A diagram is even supplied, but due to concerns about making sure the right electrical connections are made, I need help. Basic diagram in below:
    Battery charger and pure sine inverter 12v to 120v connected to deep cycle 12v battery. automatic transfer switch is connected to the inverter, house power and the pelet stove. Here is a link to the diagram:

    The parts that I have purchased are:

    *300w pure sine inverter 12v DC to 120v AC with two receptacles on the front of the inverter and two terminals to connect cables to battery in the back.

    *Lifeline 100amp hour deep cycle battery with top posts

    *10amp battery 3 cycle charger with two terminal to connect to battery on front and a power cord in the back to plug into a receptacle other than one on the inverter.

    *Prowatt 15amp inline automatic transfer swtich with 1 line to be hardwired to AC Load Only, another line to be harwired to ac source such as utility power, and a third line with a plug on the end to plug into the inverter.

    We also have proper cables and and vented battery box.

    While the diagram looks like it would be an easy set up, the automatic transfer switch and its three lines have me completely stumped. I also need to know if an inline fuse is needed and where that should be placed. There is a 15amp fuse in both the inverter and the battery charger, so I am not sure if an additional fuse is needed. I have a picture of all of the parts and can email to anyone who can help. The line on the transfer switch which in supposed to plug into the inverter, does that plug into one of the receptacles on the front of the inverter? Those receptacles say power out.

    Any helpers, thank you so much for shedding light on these questions.

    Looking forward to obtaining some wisdom about putting this all together.

    • What type of transfer switch is it that you purchased? I would recommend contacting their technical support team for help. They can help you.

  5. My pellet stove goes into shutdown mode at the slightest blip in power. My main concern is this happening while nobody’s home, and we come home to a freezing house. Does these units provide “blip-less” transfer to backup?

  6. Do you sell a system that allows a generator to be used to power the transfer switch and then use a battery to provide power to one circuit (during night)? Can they both be wired together?

  7. The link to the AIMS 1500 Watt Pure Sine Wave Inverter, Charger with built in Transfer Switch. is bad and gives an error, the only one I could find on your website that was a charger, inverter, switch is not pure sine wave inverter, do you no longer carry this item? I have tried several different computers and browsers and can not get the above layouts for hooking up the battery backups,

  8. I would like to run my pellet stove off grid.How many solar panels would it take.Also I would need a battery set up for night and cloudy days plus a inverter and other material.My pellet stove Electrical rating is 115VAV,60Hz,Start 4.1Amps,Run 1.1Amps.I would like to get a estimate for all materials and shipping to 12197 area code.

  9. Is this page no longer available?, the diagrams don’t display and the links to the pure sine wave inverter are not valid, you get a modified sine wave inverter instead
    Thank you

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