How to select what kind of secondary battery (AGM/Lithium) the MB3940 charger is connected to:
- Connect the charger to just the main vehicle battery first
- Select the secondary battery type by pressing the Battery button
- Now connect the secondary battery.
You will not be able to change the battery type once the secondary battery is connected, as this is a safety feature to guard against accidental button-presses.
The MB3940 is beeping:
If the unit is beeping without a solar panel connected, it is warning you that the secondary battery connection may have issues (battery has reached end of life or been run flat too often, wiring has poor connection or high resistance).
If connecting a solar panel, make sure it is a 12v panel - 18v or higher panels are not suitable. If the unit beeps when the solar panel is connected, check the polarity of the solar panel inputs with a multimeter, in case they are reversed.
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