Solar Inverter Connectivity Problem Reveals Weak Troubleshooting

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I don’t know of any UPS from any manufacturer, with any capacity that says it’s OK to to connect a laser printer (or other high-currently device like a kitchen appliance or a sump pump), and I think it’s precisely because of the high current draw and even higher inrush current when it turns on.

As for my UPS switching to battery from the voltage sag, I assume this is its “AVR” (automatic voltage regulation) circuit kicking in. I don’t think it detected an outage during that time. And it only lasts for a fraction of a second.

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My solar installer strongly recommended against connecting the blowers for our two gas-fireplace inserts to the backup load for the house. It was a general guideline that discourages connecting any load that includes a motor because of startup surge.

Freezer and refrigerator are connected with no problems. But they considered the little blower motors a bridge too far.

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