The numbers
| Per day | 0.1–0.5 kWh |
|---|---|
| While running | 3–54 W (0.2–4.5 A at 12 V), by speed |
| Starting surge (plan for) | up to about 108 W |
Runs straight off 12 V, no inverter, so a van battery barely notices it.
Tip: Speeds 1 to 3 move plenty of air at night for well under 1 amp.
Answer a few taps in a guide and every page like this shows the numbers for your own setup. Start
Running it on solar
At typical use (about 0.3 kWh a day), it takes one 400-watt panel to keep up through a dark winter, plus batteries for the nights.
Sized for a dark winter. Set your location · Size a whole system
How long a battery runs it
On its own, at typical use:
Questions people ask
How long will a power station run a MaxxAir roof fan?
A 2 kWh power station runs it for about 5.9 days on its own, at typical use. Bigger batteries scale up from there.
How many solar panels does it take to run a MaxxAir roof fan?
One 400-watt panel keeps up with typical use (0.3 kWh a day) through a dark winter, on its own, plus batteries for the nights.
How big a battery runs a MaxxAir roof fan for a day?
About 0.4 kWh of battery covers a full day at typical use (0.3 kWh), allowing for losses.
Power it for good
Want it running through outages, or off-grid for good? The guides size everything around what you run.
Typical ranges for planning, from US Department of Energy appliance estimates, nameplate ratings and owner measurements. Your model's label or a plug-in meter gives your exact number. More: How much power do you use?