Honda EU20i Owner's Manual page 34

Parallel operation
Please read the item ''GENERATOR USE'' before connecting any
equipment to be used.
Use only a Honda approved receptacle box for parallel operation
(optional) when connecting two EU20i generators for parallel operation.
Most appliance motors require more than their rated wattage for
startup. Make sure the electrical rating of the tool or appliance does not
exceed the maximum power rating of the generator.
Maximum power in parallel operation is:
Except U type : 3.6 kVA
U type :
For continuous operation, do not exceed the rated power.
Rated power in parallel operation is: 3.2 kVA
In either case, the total power requirements (VA) of all appliances
connected must be considered.
CAUTION:
Substantial overloading that continuously lights the Overload indicator
(red) may damage the generator. Marginal overloading that temporarily
lights the Overload indicator (red) may shorten the service life of the
generator.
4.0 kVA
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