13
CHARGING
CHARGE METHODS
Lithium batteries need to be charged slightly different to other batteries, to
ensure they live a long life and provide maximum capacity.
There are several charging devices you can utilise, but whichever device you
choose, it must have a lithium charge profile. Suitable devices include DC-DC
chargers, solar panels (with regulator) and AC (mains power) chargers.
It is recommended that the charging current should be 30% or less of your
battery capacity. You can charge at higher currents, but 30% is recommended
for optimum battery longevity.
CHARGE METHODS: DC-DC CHARGER
DC-DC chargers allow you to charge your auxiliary lithium battery from your
vehicle’s alternator.
You generally cannot charge a lithium battery directly from a vehicle
alternator, because lithium batteries have a very high maximum charge current
compared to lead-acid batteries. With nothing to intermediate between the
alternator and battery, the battery will draw its maximum charge current from
the alternator, which can lead to the alternator overheating and burning out.
A DC-DC charger will act to moderate the flow of current, protecting your
alternator from overheating. In addition, they have a multi-stage charging
algorithm which will ensure your battery is optimally charged and its service
life is maximised.
Some DC-DC chargers also include a second input allowing you to connect a
solar panel, and may even be able to prioritise the solar charge method when
it detects a panel is connected and providing current.
