Re: OT: Size required of portable generator?

Posted by John T on July 21, 2022 at 05:17:40 from (45.16.200.171):

In Reply to: Re: OT: Size required of portable generator? posted by Tx Jim on July 21, 2022 at 04:22:26:

Hi again Jim, hot down there huh DRATS !!! My daughter says I cant visit her in the summer because Im
too high maintenance lol Once there I had her go out start the car let the AC run a while then pick me up
at the door lol. To top that off I just heard someone on the news state the average power required to
charge an average EV is FOUR TIMES that required to power the AC for an average home GRRRRRRRRRRRRR Of
course as an engineer and despite the word average, I know it depends on ambient temp, how much the EV
needs charged, insulation, size of home on and on and on SOOOOOOOO many variables and unknowns. REGARDLESS
its gonna take a bigger electrical grid provided by gas or coal, nuclear, wind or solar to charge a bunch
of EV's PLUS run the AC, and MY DAUGHTER HAS AN EV (she loves) PLUS SHE HAS AC !!!!!!!

You now ask I stated my highest electrical usage for a month was 1477 KWh. Isn't that sufficient?

UNFORTUNATELY NO As I stated below:

KWH is a measure of ENERGY which is Volts x Amp x Time. What the utility charged you (Volts x Amps x
Time) and what was the maximum POWER (Volts x Amps) you used ARE TWO DIFFERENT THINGS

Watts (Volts x Amps) is a measure of instantaneous POWER (Whats the max current you need when all
necessary is running)

Your generator needs to be big enough to supply the max current draw at your operating voltage PLUS
adequate surge capacity to start devices such as compressors or cooling units etc. which may draw 3 to 5
times as much current (as normal running current) to start up

If you had an ammeter (like a clamp on) or a more exotic watt hour meter that tells you how much current
you are drawing when all your necessary tools/appliances/devices are operating NOW THAT CAN PROVIDE THE
INFORMATION NEEDED

A simple clamp on ammeter when alllllllll the necessary tools/appliances/devices are operating isnt hard
to use provided you are safe.........Then the minimum POWER (Volts x Amps) can be easily calculated and
then increase that size as necessary to allow any compressors or coolers etc to start up.

Id love to help and sorry I cant give you the short sweet answer you seek, BUT YOU NEED TO KNOW THE MAX
CURRENT the shop requires to size the generator. Again what someone else uses or any guesses are no help
YOU HAVE TO KNOW YOURRRRRRRRRRRRRR REQUIREMENTS. Get an ammeter or hire a sparky this isnt rocket science
and is a really easy number to obtain. Whats the electric service to that building ?? 100 Amp or 200 Amp
etc ??? Thats NOT definite but can help some.

Best wishes Jim, I'm on your side and am trying to help here

John T

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