Symbol Battery Advice

while the above is correct in that smart charging switches charge from one battery to another, if it is turned off, its not a good test of smart charging working and maintaining both batteries...testing them invidually as suggested will confirm some aspects physical of the solar system...is it connected right...but not the clever stuff all the fuss is about...
as smart charging moves charge to each battery for periods of time (4 hr chunks according to the manual), it may be possibly to complete the tests as above, but bear in mind Peter's caveat.

Sargent have produced their own testing guide to ensure Smart Charging is working which is as above but forces a speedier change to the 'other battery' by placing a load on it...

To confirm the Smart Charge feature is working, first ensure the system is programmed correctly as per the above information and that both batteries are charged above 12.4V.
Ensure that the Leisure Battery is selected as the active battery for charge (You should see a voltage of at least 13.6V on the Leisure Battery and the actual voltage for the Vehicle Battery e.g. 12.5V).
Place a load on the Vehicle Battery, I.e. put the headlamps on, and when this load drops the Vehicle Battery voltage below 12.4V you should observe the charger switch from Leisure to Vehicle Battery (Vehicle Battery will jump from 12.3V to 13.6V\14.4V).
After a 4 hour period the charger will switch back to the Leisure Battery for 4 hours and will then revert to monitoring the Vehicle Battery.