Honda generators are not approved for sale or use in California and cannot be registered to a California address. Using a special cable or kit, you can link two EU1000i, two EU2000i, two EU3000i Handi(TM), or two EU3000is generators together to get as much as double the output.(Please note: you can only parallel two identical units together.)Honda Product Number: 08E93-HPK123HI | Honda Parallel Cables for EU1/EU2/EU3i Handi