Originally Posted by Fighterpilot
Taking out the old Westerbeke 4.4, 120 volt gen. and replacing with same vintage Westerbeke 8.0 generator. Both WMDs. Will try to find schematics but until I do would welcome any advice. The first issue is the boat is only wired for 110. The 8.0kw has two 120 leads vice the one set that was hooked to the smaller generator. But the shore power has two connections, one for A/C only and the other for the boat which suggests I might be able to bring one leg of the generator to the A/C only side and the other leg to everything else on the boat. I would have to run another lead from the generator with the other 120 current on it and get it hooked into the circuit somehow up on the main bus. The exisiting lead from the old generator is now hooked to feed everything, so would have to find that connection and make a change. I'm assuming that if I ran but one 120 lead from the bigger generator I wouldn't have available the full amp capacity of the bigger generator. Is my general reasoning right??
Do any of your Califonians have the bigger generators with the 220 or the two 120 leads wired into it? Suspect it wasn't a 220 bus if you have the 220 capability, but rather two 120 circuits from the generator.
I'm only going to have $500 dollars plus my old generator invested since my mechanic took the generator as payment for work done and planned to put it on his boat. It wouldn't fit so he wants a smaller generator like mine for his boat.
First I would say, hire someone with Marine Electrician experience to wire it up for you.
I'm not all that familiar with Westerbeke, so you want to confirm this with someone who has expertise with that unit.
Yes you can run two 120 circuits, they're probably going to be two 20 or 30 amp services each. The problem you're going to run into, wiring it the way you are suggesting, is generators generally wants to see a balanced load. So if your air conditioning is running off one circuit and your house circuits off the other. Then you could be pulling 20 amps off one circuit and two or three amps off the other. Which could overheat the windings and damage your generator. If you have two A/C units, then better to split them between the circuits.
In any case have a pro look at it and divide up the loads properly for you. Let us know how that works out for you.