Originally Posted by Gordon
Boy, you guys have thrown open another area for me to look into. We have eight months to get this sorted before boat handover. Now I am researching AC water
makers, this will be on another thread. Still unsure what would be the best option re the gen set. We will be running 230/240 v and 50Hz. And being a catamaran
want to keep weight to a min.
Thanks for the input, it all helps and experience counts. We have only been coastal cruisers and managed on our previous boat with solar
, 600Ah house bank and a Victron Pheonix 3.0Kw inverter/charger and no where near the extra power requirements.
What size engine(s) are you looking at, if going conventional power? If they aren't too big, and your batteries have a decent CAR (Charge Acceptance Rate), then you may consider adding high-power alternators to one or both of the engines. Not quite as efficient as a genset, however not bad at all if the engine(s) can be loaded up enough. The added alts, brackets & cabling are a lot lighter than a genset and take up less space.
The caveats are a bit more fuel
use (depending somewhat on battery
CAR, etc.), perhaps louder when charging
, and some engine
mfg's don't like added alt pulley/loads on the crank bearings (may void warranty, although I've never heard of this causing a problem).
An example is a client of mine with an 55ft cat who added one APS 250A x 14V alt to each of his engines. This allowed charging
at over 400A continuously. He could run his A/C (in 2 of his 3 cabins) all night long, using up about 540Ah from a 720Ah Genasun lithium bank and recharge completely in about 1.25hrs in the morning.
This is a bit of an extreme example (using A/C off the dock
without a genset), however it gives an example of what can be done. I don't think I'd try this with conventional batteries though. Takes too long to top them off and not enough load on the engine(s).
Good luck with the new build!