August 10, 2026 – Home Owners
When a storm knocks out the power, a propane standby generator keeps your home running: heat, refrigerator, well and sump pumps, lights, and Wi-Fi stay on. It runs on fuel stored in a tank on your property and starts on its own within seconds of an outage, whether you are home or away.
Outages in the Northeast rarely announce themselves. A summer storm drops a line, a nor’easter loads the grid with ice, and the homes that stay warm and lit are the ones that were ready before the weather turned. This guide covers why propane suits backup power, how standby and portable units differ, how long a generator runs on propane, and how to size the generator and the tank behind it.
Why propane is a strong fuel for backup power
The fuel is already at your home when the grid is not. A propane generator draws from a tank installed on your property, so an outage that cuts electric service does not touch your energy supply. There is no waiting on a fuel run, and no depending on infrastructure that may be down along with the power.
Propane keeps in storage. The Propane Education and Research Council describes propane for standby power as stable, available energy that does not degrade over time (PERC, 2026), which reduces the maintenance concerns common with liquid fuels that age in a tank. The gallons you store this summer are ready in a February storm.
It burns clean and keeps the supply out of sight. Propane is a clean-burning fuel, and a standby installation has no cans to refill and store in the garage. The supply sits in the same kind of installed tank that runs propane homes across the region.
Paraco supplies propane for generators across the Northeast. If your home already runs on propane for heating or appliances, a generator can often work from your existing supply.
Standby vs portable generators
A standby generator is permanently installed, starts automatically, and can power most of your home. A portable generator is smaller, started by hand, and carries a few circuits or appliances for hours at a time. Which one fits depends on how much of your life you want running during an outage.
A standby unit sits on a pad outside the house, connected to your electrical panel through an automatic transfer switch. When the grid drops, the switch senses it and starts the generator within seconds. When power returns, the unit shuts itself down and goes back to watching.
A portable generator is the lighter-duty option: it can typically run for up to about 8 hours and keep several appliances going, which may be enough for short, occasional outages. It has to be started by hand and run outdoors only, well away from windows, doors, and vents, since its exhaust carries carbon monoxide. Our generators page covers both options in more detail.
The honest trade-off: a portable unit costs less to get into and does less; a standby unit is a true home system. For homes that lose power more than once a season, or where heat, a well pump, a sump pump, or medical equipment cannot wait, standby is the class of equipment designed for the job.
How long will a generator run on propane?
For most homes, the answer is days, not hours. A 500-gallon tank at its safe fill level can carry a typical home standby unit through roughly four to six days of an outage, and managing your load stretches it further.
Generac’s published specs for its 22 kW home standby model list propane use of about 2.53 gallons per hour at half load and 3.71 at full load (Generac, 2026). So a 120-gallon tank, holding roughly 96 usable gallons, covers about a day and a half at half load, and a 500-gallon tank, holding about 400 usable gallons, stretches to roughly six days at half load or around four at full output.
Real outages usually land better than the worst case. A generator rarely runs at full load around the clock; it cycles with what the house draws. Turning off what you do not need, big electric heat loads, extra lighting, a second refrigerator, slows consumption and stretches the tank. For context, each gallon of propane carries about 91,500 BTU of energy, a BTU being a standard unit of heat, and the generator turns that stored energy into electricity on demand.
Paraco tip: After any extended run, check your gauge or have your supply checked. A tank that carried you through a three-day storm has done its job and will want a delivery before the next one.
Sizing the generator and the tank
The generator is sized to the circuits you want covered, and the tank is sized to how long you want to run them. A licensed professional does the load calculation, and your propane supplier matches the tank and gas piping to the generator’s demand.
On the generator side, the tiers are straightforward. Portable units in the low kilowatts carry a few essentials. Air-cooled standby units, roughly 10 to 26 kW, cover the essential circuits of most homes and, at the upper end, whole-house coverage for many of them. Larger liquid-cooled units serve big homes and businesses that cannot afford downtime, from restaurants protecting refrigeration to offices keeping systems up.
On the fuel side, standby generators typically pair with installed tanks from 120 gallons up to 500 or 1,000 gallons, and Paraco installs tank sizes from 56 to 1,000 gallons, aboveground as standard or underground by excavation where the property calls for it. The right pairing depends on the generator’s draw, whether the same tank also feeds your furnace and appliances, and how long an outage you want to plan for. Configuration varies home to home: some extend an existing tank’s duty, some add capacity, some dedicate a second tank to the generator.
Installation is professional work end to end: placement and clearances, the transfer switch, and the gas piping from tank to generator all follow the manufacturer’s instructions and local codes, handled by a licensed professional. That is what makes the system safe, code-compliant, and ready to start on its own at 3 a.m. in a storm.
Keeping fuel ready between outages
A generator is only as ready as the tank behind it. Automatic delivery for installed tanks, tank monitoring, and routine service on the manufacturer’s schedule are what keep a standby system genuinely standby.
Supply first. Paraco’s automatic delivery projects your usage and schedules deliveries before you run low, with monitoring options that watch the gauge so you do not have to. It is designed to keep your supply ready through the seasons. If your generator shares a tank with home heating, that matters twice in winter, when the furnace and an outage can draw on the same supply.
The machine needs attention too. Standby units run a brief self-test on a weekly or biweekly schedule, and an annual service on the manufacturer’s instructions keeps oil, filters, and the battery ready for a real event. A quick glance at the unit’s status panel after each self-test is a habit that pays for itself.
Picture the system working as designed. An ice storm takes the neighborhood dark on a Friday night. The transfer switch catches it, the generator is carrying the house before anyone finds a flashlight, and the furnace, refrigerator, well pump, and Wi-Fi barely notice. Because the tank was on automatic delivery, it went into the weekend near its safe fill level, and because the unit had its annual service, it starts without drama and settles into its work. By Sunday the grid is back, the generator stands down on its own, and the only follow-up is a delivery to replace what the weekend used. That is the whole promise of standby power: the emergency stays an inconvenience.
Frequently asked questions
How long will a whole house generator run on propane?
It depends on the generator’s load and the tank size. As a rule of thumb from OEM specs, an air-cooled home standby unit burns roughly 2 to 4 gallons per hour depending on load, so a 500-gallon tank at safe fill (about 400 usable gallons) covers several days of continuous running, and longer with load management.
How much propane does a generator use per hour?
Generac’s published figures for its 22 kW home standby model are 2.53 gallons per hour at half load and 3.71 at full load; smaller units use less and large liquid-cooled units use more. Check the fuel consumption table on your model’s spec sheet for the exact numbers, then plan the tank around them.
What size propane tank do I need for a standby generator?
Most home standby installations pair with an installed tank between 120 and 1,000 gallons. The right size depends on the generator’s draw, whether the tank also feeds heating and appliances, and how many days of outage you want covered. Your propane supplier and a licensed professional size it as a system.
Can a propane generator power my whole house?
With the right capacity, yes. Air-cooled standby units around 10 to 26 kW handle essential circuits for most homes and whole-house coverage for many, while larger liquid-cooled units carry big homes and businesses. A licensed professional runs the load calculation and matches the generator to your panel.
Does propane go bad if the generator rarely runs?
Propane is stable in storage: PERC describes it as energy that does not degrade over time, which is one reason it suits standby equipment that may sit idle for months. Keep the tank at its safe fill level and service the generator on the manufacturer’s schedule, and the system stays ready.
Be ready before the next outage
Propane and standby power are a natural pair: fuel that keeps, stored where you live, feeding a machine built to start on its own. Paraco supports the fuel side end to end, from tank sizing and installation to automatic delivery that helps keep your supply ready for whatever the season brings. Talk to our team about making your home or business generator-ready.