Originally Posted by onthehook17
Thank you, this Victron battery combiner appears to be the perfect solution.
Next question: Has anyone done a 24 hour load calculation for their Helia? Take for example 2 liveaboard
people cruising in the tropics. What would be their 24 hour amp usage on the 12v system.
The most challenging calculation is the refrigeration usage. My total refrigeration draw when all 3 appliances
are running seems to be about 23.6 amps at 12.6v. I just don't know how many hours a day they are running.
Thanks for your help.
We lived aboard from January through May this year. I never got a really good 24 hour amp count due to too many variables (running engines, running genset, etc.). However, I can tell you that with freezer, fridge and cockpit
frig all running, all AC shut down, at anchor over night (no autopilot), we averaged very close to about 100-110 AH over 12 hours (9 pm to 9 am) in the Bahamas/tropical temps. Add 20-40 AH if you leave the inverter
on with TV, microwave, computers
, etc. all drawing some power over night. This does not include any DC watermaking time. I think our expected daily usage is somewhere around 250 AH/day. Our 600 watts of solar
was ample for now, as we did a lot of motorsailing and we frequently supplemented the power when we made water
(which was typically every other day--Spectra Newport
at 20 A per hour draw when running) with the genset. We make water whenever we motor
I think they changed our charging
layout when the local folks supplemented our DC system. I'm pretty sure we charge the house bank on both engines/alternators (from watching the voltage meter while motorsailing), not just one.
I'll have much more accurate numbers this fall, as I move the boat from Chesapeake Bay
directly to Puerto Rico
in November. But I will plan on 250 AH daily usage. Maybe a little more running autopilot
providing what it can, with balance handled by genset or motorsailing.