Yes, it appears to me that the isolator is incorrectly placed.
Isolators are generally used to divide the charging current
amongst several battery
banks, while preventing them from back-feeding and draining when there is no charge current
. These were popular in the past, but these days there are generally better ways to accomplish this task, e.g., using combiners, voltage followers, etc.
In any case, that is not what you are apparently trying to do here.
It seems to me that you have six battery banks:
1. a 120AH generator
2. a 200AH @ 24V engine
starting bank for the starboard engine
3. a 200AH @ 24V engine starting bank for the port engine;
4. a 200AH @ 24V auxiliary bank for bilge
& sump pumps, and misc. other;
5. a 897AH @ 24V house bank; and
6. a second 897AH @ 24V house bank.
The two house banks will generally be run in parallel, except for maintenance
These are charged by three Victron 24V battery chargers powered from shore or generator
, and by solar panels
controlled by the Apollo 80A capacity regulator
220VAC power is provided off grid by an 8KW inverter, drawing off the house batteries.
My first thought is that you're going to be a very busy boy there in Hong Kong
just keeping after this very complex system! Won't leave you much time to enjoy the delights of Nathan Road or Wanchai :-)
Based on a quick reading of your diagram, I'd say the first thing to do is to lose the isolator...you don't need it.
Hook up one of the Victron chargers so it's primary purpose is to charge the house batteries.
Then, use a Balmar
DuoCharge or Xantrex EchoCharge to maintain the auxiliary 200AH battery bank. No switches necessary...it's automatic.
Also, be sure the inverter is fed directly from the house batteries
, with appropriate wire and fuse sizes.
The comment given you re: ON-OFF switches vs. 1-2-Both-Off switches is generally correct. These are much easier to understand, and avoid the possibility of someone turning the multi switches to the wrong position. If you understand the system thoroughly and are very careful, you can get by with the 1-2-Both-Off switches, but no doubt the simple ON-OFF switches IMHO are to be preferred.
You have a very complex system here, my friend, and my advice would be to seek out the services of a qualified marine
electrician to look over your wiring
diagram and, perhaps, to visit your boat and have a look around. It would be well worth whatever that would cost.
With a total of 1,900AH @ 24 volts in the house bank alone, you've got plenty of power aboard to get into real trouble; seek out expert advice before you do, and don't give up until you're satisfied that you've got good advice.