question

@Ryan Leestma …. Solar is very effective. Depends upon the boat. We have a sailing yacht and can live aboard with only solar. Your boat seems much larger than ours so perhaps you could share is she a sailing vessel or power vessel and what size? Twin engine or single?

Power vessel - 70’ twin 305hp Cummins - slow boat full displacement at 8 knots

I would think about LiFePO4 batteries with this setup.

We live on a 40ft sailing catamaran, we are confortable with 1650Wp of solar and 1000Ah of LFP batteries 12V system (15kWh usable), 2 small start batteries for the engines and the Onan generator (7kW). One Quattro 5000, a backup Mastervolt 2000 inverter, that can juice up the Quattro to 7kVA if needed.

I consider this as the minimal setup for living offgrid most of the time, but being able to recharge quickly (within 3h) when necessary. We ditched propane, we use residential appliances (4 burner induction hob, residential oven, residential deep freezer, all the normal appliances), of course watermaker and washing machine...

We do have 4 AC units too, but rarely use them, as we do not motor a lot - we use our sails a lot and they shade the panels under way - we are happy to have the generator. You having almost 4 times the size and a lot of chillers may need 4 times the capacity.

Thanks… thats a big one.

For fast charging upgrade house bank to lithium. Could change start and thruster to lithium also if you wish.

Large alternator with external regulator on both engines to charge house bank.

Start banks charged off house bank with Dc-Dc charger.

I guess chillers means AC units. They are probably large units(24,000BTU) so may be too much for inverters because of inrush current.

Plenty of solar is a nice way to not run generator but with that much Ac if it is to be used you have no choice. Could just decide on one or two to be run off inverters.

If they were Quattros it would be easy to start generator and seamlessly transition to generator when batteries are low. Multiplus will require external switching for that function.

Plenty of choices to be made with your project. Good luck with it.

I was headed your way, two Quattros with two HO engine alternators. I like going house to starter w relay, smart. The big chiller is 24000 btus, others are 6-12k. Would I be ok w two 8k Quattros?

24,000 BTU is too much for 5kva Quattro. 8kva should be ok but I have not actually tried it so cannot 100% confirm. The smaller AC units will be fine. If the 2 x 8k Quattros are in parallel it will be fine but not sure if you will run them parallel or separate. With two gen sets I can see advantages either way.