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Sumboodie

Well-known member
Joined
Mar 20, 2021
Messages
10,647
Location
AK
“is a 75 kw generator too much for a 400 amp service single family house?”
400 amps is 96kw.

All depends if they actually need that much power. Most places here are 100 or 125 amp.

I have a 7kw gen set that handles everything I need.
I meant maybe can't run the dryer while heater up my Swanson's TV dinner and fish sticks in the toaster oven while welding and filling truck tires. 🤣
 

mike93lx

ALLIANCE MEMBER
Joined
Dec 9, 2013
Messages
37,338
Location
Richmond, VA
It's not too big in the sense that it won't function. But it's likely going to waste a massive amount of fuel as I doubt many homes use anywhere near that much power
 

TractorJeff

Well-known member
Joined
Dec 8, 2013
Messages
3,309
Location
Elkhorn, WI
If he is like some people, he wants the house the same all the time. Whether he actually has the multiple air conditioning units running or not.
 

walta

Well-known member
Joined
Jan 13, 2017
Messages
2,307
Location
Dutzow Missouri
Yes, It would be great to have the huge gen set and go about your life as normal right thru any outage.

Consider a gen set that size is going to run its weekly self-test and burn thru a lot of fuel. At my place a 15-minute weekly self-test would burn 3 times more fuel than power outages would burn. If the fuel is coming from a tank on site when the outage does happen how full will the tank be when you need it? How will you feel paying hundreds of dollars to refill the fuel tank and the only outage you can recall was 5 minutes last year?

I understand large gen set do not like to operate lightly loaded and burn much more fuel per watt of power produced lightly loaded.

It is a great luxury but at what cost?

Walta
 
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Lassen Forge

Well-known member
Joined
Apr 26, 2014
Messages
14,998
Location
The romantic hills of central Umbria, Italy,
I way oversized ours for emergency power at our house, 22KW 230V figuring 2 things - 1, if I needed to run everything at once (including the wall heaters), and the well pumps kicked on, would it cover it?, and 2, if I was running the generator at low capacity (say 2500 watts) it would be barely sipping fuel.
Both scenarios played out, one winter we needed the wall heaters, electric oven, well pump, and shop... no problem. When not, however, it would stretch the 350 gallon propane tank almost a month.
Side info - One, we went with Propane as we had the tanks installed, and while propane is not as thrifty as, say, diesel, it also doesn't grow algae and fungus... since we were setting up for a potential "dimished grid situation", we wanted enough to keep the power on for quite a while if needed, ergo it lasts indefinitely without degradation. Also I already had experience with a propane portable genset at altitude, so knew the consumption issues and that running a correctly tuned genset with little to no drag induced from the rotor/stator interaction from having low demand (the more demand = the more drag from the generator = more fuel needed to spin it)...
 

Steve from Socal

Well-known member
Joined
Jan 27, 2009
Messages
3,490
Location
Hutchinson Ks.
Unless you have a nearly consistant 50 KW load roughly 200 amps that generator would be very inefficient. A 25 KW gen set and battery bank for surge demand would perhaps be a better fit?
 
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