5
1. DC Battery Input
Once correctly installed the MA21DCS needs the battery chemistry to be selected, then it will
operate automatically with no further input.
Start the vehicle and let it idle
The charger will recognise that there is charge going into the main starting battery
Once the main starting battery reaches 13.0V (11.5V if ignition sensor is installed), the MA21DCS
will begin charging the auxiliary battery
Change the battery chemistry setting to suit your application. The default setting is Lead Acid.
Once selected, the charger will remember this as the new default setting, you do not need to
change the setting again
The charger will continue to operate until the vehicle is switched off (Ignition sensor connected)
and/or the main starting battery drops to 12.4V
2. Solar Input
If a solar panel input is connected to the MA21DCS, it will automatically accept power from the
panels once the engine has stopped running and the main battery has dropped to 12.4V.
Minimum solar input voltage is 13.5V, maximum is 25V. No regulator is required between the
charger and the panels if the panel output voltage is within those parameters.
OPERATING THE CHARGER
Red LED indicates
Solar input is active
The battery chemistry selected
is indicated by the blue LED
Red LED indicates
POWER in on
Red LED indicates
the unit is CHARGING
GREEN LED indicates
battery is FULLY CHARGED
Charger Display
