Do a search on “Generator” on the community forum. Several threads in different places on this topic, but no strong determination on whether one needs to size the generator for the absolute worst case power spikes or for the 1/2 second root mean square (RMS) power consumption that you see in the power meter. Large motors have huge inrush current and power spikes when they start up, before the windings energize, although some have run-start or compensation capacitors that reduce the spike. There’s also the question of whether you want to size for whole house needs, or just critical circuits. Typically critical circuits are motor-heavy - refrigerators, furnaces, pumps.