These are usually standby systems that provide an automatic backup for homes and offices. They are typically liquid propane or natural gas powered. They can either have a manual or automatic switch. With manual system the user is required to power up the generator during the power outage vs. automatic ones will start as soon as the switch registers the power failure in the building. They have long our operations that can be as much as 15 hrs of running time. The wattage output on these units varies between 7,000 W to 40,000 W.

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