Posted by zuhnc on August 22, 2021 at 12:28:12 from (174.234.136.250):
In Reply to: Stand-by genset posted by DannyE on August 22, 2021 at 08:52:24:
20 KW gives you 83 amps on 240. The 100A transfer switch will be adequate, as long as you have it feeding a sub-panel with all your critical loads.
If your house has a 200A service feed, and you want to switch the whole house, you need a 200A service-rated panel, UNLESS you have your main disconnect (nothing between this and the meter) prior to the ATS.
I have no experience with the load management modules, but I have heard, from friends that have such a system, that they are sometimes problematic, when various equipment tries to come on-line at the same time. The management modules don't know what to do.
In my opinion, use the 100A ATS feeding a 100A sub-panel, and put all your critical loads (A/C, freezers, refrigerator, water heater (if electric), and some lighting on it. I have my 15KW unit wired this way, and it runs all those loads without issues. My stove is gas.
If you do put the stove on the emergency circuit, don't use it unless you turn off the water heater or A/C first. I don't think the 20KW will do all those loads at once.
Remember that the A/C has large starting current requirements - 2-3 times running requirements. The nameplate will give you that data. The water heater, using 4500 watt elements, is 4500 watts continuously, while it is heating the water. That is 1/4 your generator output.
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