Toby, I concur with Greg's observations. Our real world cruising experience of
electrical power use is on a
Lagoon 400, 3
cabin, two
head, so similar features to your soon to be 440. Our situation is normally two people on board, sometimes five, and lots of larger social gatherings with
meals while sailing the
East Coast of
Australia for the last two years. The first year we had 900 watts of ten year old solar, I upgraded to 1400 watts with
MPPT controllers and it changed the boat's "liveability".
Power Supplies:
3000W
Victron inverter for 230 Vac supply
1400W Solar via two
Victron 100/50 MPPT
Two
engine based 12Vdc 30Amp alternators
840 Ah of
AGM batteries
Honda Portable
generator 230Vac @ 2200 watts
230Vac Loads:
Galley has:
• Jug 1200 watts
• Microwave 1200 watts
• 3l Air Fryer 1200 watts
• 2 Slice Toaster 1500 watts
• Coffee Maker 900 watts
• 2Litre Blender 600 watts
Note - OEM
Propane system for ENO
oven, 3 ring
stove top and BBQ
40L (Quick Brand) waterheater 1200 watts
160L / hour (Australian
Watermaker Brand)
watermaker 3000watts
Television 500 watts
Computer 600 watts
Colour printer 500 watts
All standard Lagoon 12vdc features plus:
• Full
navigation suite including 12" MDF,
radar and 3d Sonar
• Two 80L fridges, one 80L
freezer
• Four Sirocco Fans
• One
Harken electric winch
• One 5.5barg Wash down
pump
• Cell Fi Go and 12vdc Wi FI
modem for
internet
•
AIS transceiver
• Two SeablazeII RGBW underwater lights
• LED RGBW effect
lighting in
galley and
cockpit
• Hot
water reticulation
pump system
• Hot
water heater energised via the
inverter once we are at > 90% SOC (normally by 11:00 each day)
Operation and observations:
We are only mindful of the total 3kVA limit on the inverter when multiple galley
appliances are being used to prepare large social
meals, but otherwise for us, our boat living is the same as apartment living. (Fresh coffee via coffee machine , followed with fresh butter croissants via the air fryer first thing in the morning etc.) With good power and
water maker capacity we supply potable water to our washdown pump as it keeps the
cockpit nicer,
shower with hot water daily and cook what ever / whenever we want.
The largest
battery draw down on any occasion is when the solar
panels are finished generation for the day and we have a 40 - 50 minute draw in an evening by the Air Fryer doing wonderful roasts. Majority of foods only takes 3 -20 minutes. in our option, the Air Fryer
food turns out better than that cooked in OEM galley
heating ENO Perigold Gourmet
oven. My main
advice to you, is to ditch the gas oven and any microwave, and install a combi AirFryer/Inverter Microwave combi oven and use that in your
electrical calculations. You will save space and have a very happy admiral, plus better
food, and less galley heat.
Conclusion:
Four months sailing the East Coast of Australia during 2021
winter, lowest daily (24hour) SOC recorded in a morning was 55% of the 420 Ah limit (based on 50% usable of total
AGM.) We only used our
Honda portable for a total of 5 hours during the 2021 trip, and that was when we had 4 day rain /
wind event while at
anchor and wanted hot water, more potable water and to boost the batteries, so ran it twice during that one event. When the AGM eventually run their useful life, I'll upgrade to
LiFePO4.