Guides
Answers to the questions that come up before a wiring job, each with the calculators that finish the math.
How do you hook up a portable generator to your house?
Hook up a portable generator through a transfer switch or breaker interlock plus an inlet box. Options, 2026 costs, amp ratings, and placement.
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How much does a whole house generator cost?
A whole house generator costs about $7,000 to $15,000 installed in 2026. See unit prices by kW, what the install includes, and fuel costs per hour.
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How to check a GFCI outlet
Press TEST, confirm the power cuts and RESET pops, press RESET, repeat monthly. What the LED colors mean and what to do if it won't reset.
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How to check battery voltage with a multimeter
Set the meter to DC volts, red on plus, black on minus. A rested, full 12 V car battery reads about 12.6 to 12.9 V. See what other readings mean.
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Inverter generator vs generator: which one to buy
Inverter generator or open-frame generator? Compare power quality, noise, fuel use, price per watt and weight, with maker specs and a sizing example.
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