How It Works - NDS SUN CONTROL MPPT User Manual

6. HOW IT WORKS:

Just after the installation, the device is ready for use.
It is recommended to properly select the most suitable charging curve for the service
battery, by setting the jumpers that correspond to the construction technology of the
battery. Jumper SW3, if inserted, allows to eliminate the Desulphation phase from the
charging curve, useful if you have an onboard control units and appliances sensitive
to voltages above 15V.
The green LED flashes to indicate that the the service battery is charging, only if the
photovoltaic panels produce a higher voltage than the battery. The number of LED
blinks, followed by a pause, indicates the charge phase running and ranges from 1 to
4 blinks.
If the photovoltaic panels generate electricity and the service battery is charged
between 80 % and 100 % , if the starter battery has a voltage lower than 12.5V and
therefore needs a refresh, the system activates the charge with a maximum current of
4A also on the starter battery, in order to restore the missing charge.
When the photovoltaic panels do not have more energy to be delivered due to lack of
sunlight, the system terminates the charge and switch in stand-by mode, in this phase
the LEDs do not flash and the overall consumption is reduced to the minimum.
Phase 3 Phase 4
Phase 1 Phase 2
LED BLINKS
7