Had a very interesting afternoon, manual in hand, learning
about my Link 2000. Have managed to get the "LOBAT" message to stop flashing at me, but I don't understand why. Any explanations would be much appreciated.
As noted in my OP, the Link 2000 on my boat controls only one battery bank, which has a capacity of 600 Ahrs, and the Bat Capacity for BAT1 has been set accordingly. I started by checking each of my 6 x 6V batteries with a multimeter, and all read 6.47 to 6.50 V, which is OK.
I then checked the settings (F01 to F15) - all were set at their defaults, so changed F11 from "Off" to "On" (thus Bat 2 will not be used for control), and changed F13 (the Discharge Floor) to 75%.
Then at rest (nothing switched on), the Link 2000 indicated the following for BAT1 : V=12.95, A (draw)=0, Ah=-0.3, Time=CCC. On switching on my fridge and freezer
these changed to V=12.85, A=-13.5, Ah=-0.6 (and dropping), Time=33.6 (with discharge floor set at 75%). It appears so far so good, but "LOBAT" message was still flashing at me.
Then, although there is no BAT2 battery bank, I checked all the F settings for BAT2. These were all at the default settings, so I left them alone (F13, the Discharge Floor is set at 100%). I then set the battery capacity at 600 Ahrs (even though no BAT2 battery bank exists).
At rest, the Link 2000 showed V=12.90, A=0, Ah=-483.6, Time = CCC. When I switched on my fridge and freezer
these changed to V=12.80, A=0.2, Ah=-483.6, Time - CCC. Clearly the Ah reading at minus 483.6 is an anomaly, as there is no BAT2 to be discharged to this level.
At this point I switched on my shore powered battery charger
(a Link 25), and the charging
cycled through charge, accept, and float over a period of about 2 hours. After charging
the BAT1 Ah showed as +36.60, and the BAT2 Ah showed as -488.2.
At this point I increased the battery capacity for BAT2 to 1000 Ahrs, and this stopped the "LOBAT" message from flashing.
Do I have a ghost battery bank??? Having now attained a much improved understanding of my Link 2000, I would be really keen to understand what is happening here.