If your HVAC is 240 then you have more HVAC load than that generator can pull on just that one load.
40 amps x 240 Volts is 9600 Watts. 7.5 kW generac will only deliver 31 amps at 240 VAC And you really don’t want to load a generator up that much. 50% is a good derating factor. Also, generators publish their power output at sea level. Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 70 degrees F Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the summer at 110 degrees that is another 8%. So you lose as much as 23% of capacity on a hot summer day. Worse if you power it from natural gas. I would add up all your loads, add 50% for growth then double that figure for not loading the generator too much and to account for derating. The installation is the expensive part. Don’t scrimp on kW at this stage of the game. Sounds to me like you need a 20 kW or more depending on your true HVAC loads. From: Sterling Jacobson Sent: Saturday, February 8, 2020 6:04 PM To: AnimalFarm Microwave Users Group Subject: [AFMUG] Generator for office I need a smaller footprint generator for my 1300 sqr foot office. Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes the 50A transfer switch. I think my breakers has several 20A switches and 40A for the HVAC. Not sure if this would cover the power needed for the whole unit, or just the fiber cabinet/rack I have that has max 20A circuit to it? The next highest power draw is probably the HVAC and/or water heater. The lights only draw about 500W since I switched them all to LED. -------------------------------------------------------------------------------- -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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