Have a piece of communications equipment that normally runs on 220 v. Its rectified to 24 VDC and and draws 300 A. Which is a 7.2 KW generator requirement. Right? Is it that simple.
Can AC power consumption be ballparked by timing the AC meter spin over a few minutes and counting the number of spins. What does each number on the meter circle represent? Watts KW? The spin velocity doesn't change much because their aren't other loads kicking in and out.
A spinning disc watthour meter will have a rating Kh stamped on it. This is the meter constant, in watt-hours/revolution of the disc. If the meter is connected through metering transformers there will also be a 'Multiply By" label on the meter.
For example, if your meter has a Kh of 1.2, and a "Multiply By" of 400, each rotation of the disc represents 480 watt-hours of energy usage..
A.
Your load could have significant (a) inrush (b) harmonics and (c) capacitance. A generator does not enjoy a load with any of these characteristics. If your load normally draws
300A, what's the most it draws? You'll want to design to that number and add a little margin. There will also be some inefficiency in the power supply, meaning you'd need to generate more power than your load consumes. A generator dealer could help you. Hopefully you could tell him or her about your equipment's power needs in detail. They'll probably advise a generator much larger than 7.2kW. If you do, let us know what they told you. jPolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.