Pellet stoves run on 125–200 watts and spike to 300–500 watts at ignition, so a battery backup must cover that surge, not just the running watts.
A power blink stops the auger, snuffs the flame, and sends smoke into a house that’s already losing heat. Most people check only the running watts — but the startup draw decides whether an inverter rides out the first minute of an outage or trips when the igniter fires.
How Many Watts A Pellet Stove Draws
Most pellet stoves pull 125–200 watts during a steady burn and jump to roughly 300–500 watts while the igniter runs. That second figure sizes the equipment, and published specs vary enough that your stove’s manual beats any general rule. Three real spec sheets show the spread:
| Stove Model | Running Draw | Startup Draw |
|---|---|---|
| Harman Accentra | 340 watts | 440 watts on the start cycle |
| Hearth & Home Technologies P43 | 200 watts standard (1.7 A) | 460 watts max (3.8 A) |
| Vogelzang VG5790 | 180 watts operational, 3.0 amps at 120 V | Igniter stage, listed separately |
| Range across models | 125–200 watts | 300–500 watts |
Size from the highest figure your manual lists, never the lowest.
What Size Battery Backup Do You Need?
Two numbers drive the choice — continuous AC output that absorbs the startup surge, and battery capacity for the hours you want. The rule of thumb is running watts × hours: 100 watts × 8 hours = 800 watt-hours, plus reserve for surge and for a battery that sits in a cold garage.
If you’d rather skip the arithmetic, our roundup of tested backup batteries for a pellet stove lines up surge ratings and real runtime so capacity can be matched to your stove in one pass.
Two mistakes show up constantly: sizing for running watts alone (an inverter that cruises at 180 watts can still buckle when the igniter asks for 460), and assuming one setting fits every stove — Harman splits its approved hardware into pure sine wave and non-pure sine wave groups with different instructions for each.
Wiring, Settings, And What Trips A Stove Up
Three things decide whether a backup carries the stove through an outage: inverter settings matched to your control board, hardware kept clear of stove heat, and a battery that never sits discharged.
Inverter Settings Aren’t Universal
Harman splits its approved units by waveform. The APS1012SW is pure sine wave, so no special setting is needed — it takes over automatically when power drops and the stove keeps burning.
Thelin’s Built-In 12V Option
The Thelin Tiburon manual describes a factory 12V battery backup that switches the stove over automatically once installed. Installation means unplugging the stove, opening the hopper lid, removing the left side panel, connecting the red positive battery cable to the battery’s positive terminal, refitting the panel, plugging the cord back in, then setting the Battery Switch to Internal Battery so the stove keeps it trickle-charged. A switch at Internal Battery with the stove plugged in is the sign it’s working. The manual also warns against leaving the stove unplugged, because the battery will lose its charge.
Siting And Shutdown Habits
Harman’s guidance keeps the inverter/charger and deep-cycle battery away from stove heat and off the stove itself. During operation and shutdown, the hopper lid and doors stay closed — leave them open and smoke finds its way into the room.
Numbers To Gather Before You Buy
- Running watts, from your stove’s spec plate or manual.
- Startup or igniter watts, almost always the higher figure.
- Target runtime in hours, multiplied by running watts for watt-hours, plus reserve.
- A battery spot stove heat can’t reach.
FAQs
Can A Car Battery Run A Pellet Stove?
A deep-cycle battery paired with a matching inverter can keep a pellet stove burning, but a standard car starting battery is a poor choice — it isn’t built for repeated deep discharge and won’t hold up. Harman’s approved setups use deep-cycle batteries with compatible inverter/chargers, and SEC America’s systems follow the same deep-cycle approach.
How Long Will A Backup Keep The Stove Running?
Harman states its three listed Tripp Lite inverter/chargers can run the appliance for up to eight hours in a power failure. Real time depends on your battery bank’s watt-hours, the stove’s draw at each burn stage, and how cold the battery gets. Doubling usable capacity roughly doubles the runtime.
Why Does The Stove Quit The Moment Power Drops?
The auger, blower, and igniter all run on electricity, so an outage stops fuel from feeding within moments and the fire dies. Stoves with a wired backup keep running: the pure sine wave APS1012SW takes over by itself, while the other approved units need the Continue Operation setting in place first.
References & Sources
- Harman / Hearth & Home Technologies. “Battery Back-up Options Addendum” Lists the approved Tripp Lite inverter/chargers, the up-to-eight-hour runtime, and the settings required for non-pure-sine-wave units.
