Thanks for starting the thread.
Our use case is based on being able to go three days without charging
. Our second battery box
is under the aft bunk and difficult to get to for watering. In 2017 I was not confidant that LI batteries would be trouble free and I wanted a solution that was not going to give us problems while cruising remote
We have 660 watts solar, Honda EU2000 generator
, and a Balmar
. Our active shore charger
is a Sterling Pro 40amp. Our power budget
is 240 amp hours per day at 12V, half of that is refrigerator/freezer. We have seven Group 31 Firefly batteries for a theoretical capacity of 812ah.
We have taken our batteries down to 12V, which is about 60% DOD/40% charge per the attached test report.
Fast charging - we installed a Victron Multiplus 12/3000/120 that can charge at 120 amps given enough shore power
. It is only invernting now; I need to get the charger
hooked up. Right now, the fastest charging we can do alternator plus solar when motoring that pushes about 80amps.
I set charge efficiency at 95%. This is likely too high as I see 22amps going in today when the BMV-712 thinks the batteries are fully charged. I just dropped that down to 92% and I'll see how that goes.
We try to keep DOD less than 50% based on the attached test report, about 12.3V.
Fully charging the batteries depends on solar. This week in Grenada
we are at 100% by noon. We upgraded to a Victron BMV-712 battery monitor
three months ago. The BMV-712 thinks we have been through 8 discharge cycles since then.
We have not done a restoration
charge. I may give this a try when we get the Victron battery charger hooked up. With our configuration it would be an effort to get the voltage in the bank down to 10.5V would take an extended effort.
We stored our boat on the hard
last summer with no charge sources. After three months that batteries were at 12.6V, around 10% DOD.
BruceSchwab.com is keeping an operating manual updated. The July 2020 version is at https://oceanplanetenergy.com/wp-con...1-4V-450Ah.pdf
I got a Balmar regulator
configuration from Bruce Schwab - attached.