I went for a Victron BMV 702. It has smart features such as % charge and amp hours left, temperature monitoring etc. The only problem with installing it was I had to strip out all the wiring from the old monitors since it was on the positive side of the circuit and mount the new shunt and its interface on the negative, This entailed quite a bit of re-wiring but the installation now looks a lot neater. I also installed a second Adverc Easy Check LED system which is an invaluable tool for keeping tabs on batteries. As you walk through the engine room you can instantly detect and battery/charging problems by the colour of the LED. The new LED monitors the engine start battery, the old one the domestic. Hopefully the system and batteries will work as we travel north over the next few days.
Battery monitoring - Version 3
(Victron BMV 702 plus two Adverc Easy Check LEDs)
Battery monitoring - Version 2
(Sterling Power Management plus one Adverc Easy Check LED )
Battery monitoring - Version 1
(Adverc DCM monitor top left with Adverc BM system to control charging on bottom right)