LINK 2 x EU10i, 2 x EU20i or 2 x EU30 Honda Generators together with this Link Cable and you double the available power.
2000 watts with 2 x EU10i's, 4000 watts with 2 x EU20i's and 6000 watts with 2 x EU30's linked... Brilliant engineering ... typical Honda.
NB. They must be the same model of similar vintage and run at the same setting. Eco switch on or Eco switch off.
Call and ask if you are not sure if yours is compatible before you buy a new one.