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Additional information
Deep cycle batteries
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 100amp battery in good condition should o er
50amp 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 24 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 48 amp hours using a 10 amp DC-DC charger will require at least 5 hours of
driving. A twenty amp unit will require at least 2.5 hours of driving to fully recharge the battery.
Undercharging a battery and discharging to below 50% can severely impact on life expectancy
of most deep cycle batteries.
Approximate
state-of-charge
100%
75%
50%
25%
0%
The readings are taken at room temperature of 26°C (78°F); the battery had rested for 24 hours
after charge or discharge.
Voltage readings & speci c gravity of electrolyte (lead acid batteries) can give an indication of
your battery' state of charge.
Average speci c gravity
1.265
1.225
1.190
1.155
1.120
Open circuit voltage 12V
12.65
12.45
12.24
12.06
11.89