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House Works: Powering up to choose a generator

- Apr 08, 2018 -

Regardless of your planned intentions, the first question to ask is how much power do you need?

Generator output is rated in watts. A 3500 watt unit, for example, can power household lighting, a fridge, water well pump, microwave, sump pump and a freezer, though not all at the same time.

A 9000 watt portable generator can handle most of these things more or less at once. Something called standbygenerators are different and bigger. Theyre not portable, theyre permanently wired to your home, they generate large amounts of power, and they start themselves automatically when grid power goes down. A 14,000 watt standby generator will energize most homes completely.

Another issue youll face as youre thinking about portable generators is what type to choose open frame or inverter? Open frame generators are the simplest and offer the greatest wattage output for the price. If all you want is basic backup power with no need for exceptionally quiet operation and variable engine speed, then an open frame is the way to go.

Inverter generators cost more for a given wattage output than open frame, but they’re more fuel efficient and quieter. A recent addition to the world of generators is something called a digital hybrid. It combines the quiet operation of an inverter with the lower cost of an open frame model. We’ll be seeing more of this kind of innovation in the future.

Heres a rule of thumb to keep in mind: the larger the generator output, the more it costs, the heavier it is, and the more fuel it burns per hour.

It’s one thing to have a generator at the ready, but you need to prepare yourself to keep it running. Storing gasoline is one issue that’s easy to get wrong. While you need to keep enough on hand in approved containers in a garage or shed (never inside your home), gasoline doesn’t stay fresh for more than a few months unless you do something about it. Gasoline preservative makes the difference. Add a few tablespoons of this liquid to fresh gas before you store it and it’ll last for at least 6 months without trouble. Keep your gas fresh by using the older stuff in your car before refilling your cans with fresh.

If you have a choice, gasoline purchased during cold months is best. Its more volatile than gas produced for summer use, so it burns better if you happen to need it during winter.

Motor oil is another issue. Most generator engines are similar to other small motors in that they require an oil change after 25 to 100 hours of operation. That sounds like a long time, but less than a week of generator use will get you there. You need to prepare yourself for maintenance in the middle of an outage. Keep a couple of gallons of the right kind of motor oil on hand.

You never know when an extended power outage will strike, and thats why it makes sense to prepare. Even before you need your generator for electricity, its there, ready, providing peace of mind.


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