| 7MANUAL
DC-DC BATTERY CHARGER
WITH SOLAR INPUT
20AMP & 40AMP
CHARGING VOLTAGES
GEL AGM / LEAD ACID CALCIUM LiON
BOOST 14.3V 14.0V 15.0V 14.0V
CHARGING 14.3V 14.7V 15.3V 14.4V
MAINTENANCE 13.5V 13.5V 13.5V –
ADDITIONAL INFORMATION
It is expected that this charger will be used to charge a deep cycle type auxiliary battery.
Deep cycle batteries are designed to provide battery power to run items like fridges and
lighting in caravans and campers.
It is generally accepted that the life of a deep cycle battery can be extended if it is not
discharged below 50% of its full capacity. A fully charged 100 Amp Hour (Ah) battery in
good condition should oer 50 amp hours of power without impacting on its normal
life expectancy.
Your average compressor style fridge uses up to 5 amps. Over a 24 hour period it should
use approximately 30 amp hours. Therefore if the 100AH battery is operating only the
fridge (and receives no additional charge) it ideally will require recharging after 48 hours.
To replenish these 60 amp hours using a 20 amp DC-DC charger will require at least 4
hours of driving. The last 10-20% of battery charging is slow, the closer it gets to 100%,
the slower it is. Undercharging a battery and discharging to below 50% can severely
impact on life expectancy of most deep cycle batteries.
DEEP CYCLE BATTERIES
Approximate
state-of-charge
Average
specic gravity
Open circuit
voltage 12V
100% 1.265 12.65
75% 1.225 12.45
50% 1.190 12.24
25% 1.155 12.06
0% 1.120 11.89
The readings are taken at room
temperature of 26°C (78°F); the battery
had rested for 24 hours after charge or
discharge.
Voltage reading and specic gravity of
electrolyte (lead acid batteries) can give an
indication of your battery’s state of charge.
NOTE: Battery manufacturers sometimes specify charging voltages.
Not observing their charging instructions may void your battery warranty.
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