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Standby generators

Power that arrives before you notice it left.

Explore all 42 What decides the fit
Standby generators

The three we would put in your room

Sentinel 24 kW Standby

The one we lead with

Sentinel 24 kW Standby

Air cooled, 200 A transfer switch

$8,900

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Bastion 48 kW Liquid Cooled

Also worth the room

Bastion 48 kW Liquid Cooled

Three phase capable, weather enclosure

$22,400

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Relay 100 A Transfer Cabinet

Where it starts

Relay 100 A Transfer Cabinet

Automatic, service entrance rated

$2,150

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What decides one of these is distance to windows, doors and vents, service or transfer switch rating and length of the pad or footprint — measured before the order, not after it.

What decides the fit

Distance to windows, doors and vents
Five feet or more from any window, door or vent, with the manufacturer's own side and rear clearances kept, is the arrangement most installations are approved on.
Service or transfer switch rating
A 100A to 200A service is the common whole-house case, and the transfer switch is sized to the service, not to the generator.
Length of the pad or footprint
Three to six feet of pad covers most residential air-cooled standby units with room to work around them.

Worth knowing before you order

Why transfer switch

A standby generator does not simply plug into the house. It connects through a transfer switch, which disconnects the building from the utility before it connects it to the generator. That is not a convenience feature — without it the generator can push power back down the utility line and injure whoever is working on it, which is why it is a code requirement everywhere and why the install is licensed work. Automatic switches sense the outage and start the set themselves; manual switches are cheaper and require someone to be home. The switch also decides what actually stays on, because most installs back up selected circuits rather than the whole panel.

Sizing

Sizing is a load calculation rather than a guess, and the trap is starting current. Motors — a well pump, an air conditioner, a furnace blower, a fridge compressor — draw several times their running current for a moment when they start, and a generator that matches the running load will stall on the surge. Whole-house sizing covers everything at once; essential-circuit sizing picks what genuinely has to run and is much cheaper. Deciding which circuits matter is the useful conversation, and it is best had with whoever will do the electrical work.

Fuel

Natural gas is the easiest to live with because the supply never runs out and nothing needs refilling, but it needs a gas line sized for the additional load, which is a real check rather than a formality. Propane suits properties without gas and gives you a tank you can size to the run time you want, at the cost of monitoring it. Diesel is mostly commercial: efficient, long-running, and it brings fuel storage and maintenance obligations. Note that a set derates on propane compared with natural gas, so the same unit produces slightly less.

A presentation set. Venerabull is in its first phase and is signing its first manufacturers — the models on this page are our own, shown so a maker can see the page their line would get. As lines are signed their real products and photography replace these, and anything that was never inventory comes down.

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Heavy, premium goods for the home and everywhere that isn’t. Venerabull LLC · New York.

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