can i hook up my older honda eu2000i to my new eu2200i to get more power?

Maybe. Specific serial number compatibility is required.

You can only pair an EU2200i with an EU2000i or EU2000i Companion if the EU2000i model's serial number is within these ranges:

• EAAJ-2017305 and later.
• EACT-1000001 and later.

Procedure:

1. Verify both generator serial numbers are compatible.
2. You must use an official Honda-approved parallel operation cable kit. No substitutes.
3. Connect the cable to the parallel operation outlets on both generators.
4. Start and operate both units.

Never connect an EU2200i to a different generator model other than those specified. Incorrect pairing can damage both generators.