“peak demand” & “net peak demand” and the setting sun

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August 4th, 2021 at 5:37:06 PM permalink
Pacomartin
Member since: Oct 24, 2012
Threads: 1068
Posts: 12569
Quote: kenarman
Many full size double door fridges wouldn't be able to run on that. They likely need 2000W of surge capacity to get them started.


I thought most refrigerators could be plugged into regular 15Amp sockets. Since 15A*120V=1800W doesn't that mean a 2000W surge would trip the breaker?
August 4th, 2021 at 7:20:56 PM permalink
kenarman
Member since: Oct 24, 2012
Threads: 14
Posts: 4515
Quote: Pacomartin
I thought most refrigerators could be plugged into regular 15Amp sockets. Since 15A*120V=1800W doesn't that mean a 2000W surge would trip the breaker?


These are specs of the device you quoted in your OP.

That device ECO flow RIVER Pro $649
Capacity:720Wh Life Cycles: 800+ Cycle
Output: 600W (Surge 1200W)
AC Input: 660W Max

Its output is only 600W and quotes a 1200W surge. Surge is the maximum very short term output the generator can produce to get a motor started. If the spec is accurate it is unable to produce the surge necessary to get the compressor on a larger fridge started.

In answer to your question above a 15 amp breaker would probably not trip on a 2000W load for several minutes from a cold start. As the breaker heated up from continuous overloads that time would get shorter. A 15 amp breaker would likely handle a 3000W surge load if it was of short duration.

Breakers are only designed to handle 80% of name plate rating on a continuous basis. So a 15 amp breaker should only have 15 X 80% = 12 amps
12A X 120V = 1440 watts maximum load if it is classified as a continuous load.
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