Uniteck UNIBAT 80.12 GEL Mode D'emploi page 23

CHARGING STEPS
In order to enjoy completely of UNIBAT batteries storage capacity and power performance, it is
recommended to charge at least in 3 steps: bulk/boost (main charge), absorption (equalization), float.
Bulk/boost
Current (A) = 25% of the capacity
(max 40%)
Absorption / Equalization
Charging current (A) = 20% of the
capacity
Charging voltage = 14,4V
(accepted: 14,1-14,7V)
Floating / maintenance
charging
Current (A) = 0,5% of the capacity
End of charging voltage =
- with charger = 13,2V-13,7V
- with Solar = 13,6-13,9V
Those 3 steps are minimum steps you need to do in order to ensure a 100% charge for an occasional
use. For regular charge and intensive charge, it is recommended using multi-steps evolved chargers (cf
chargers UNICHARGE or charge controller UNIMPPT). Thanks to it you can enjoy completely of your
batteries performances (cycling number, lifespan)
Threshold voltage adjustment according to ambient temperature
Charging voltage data are indicated for an ambient temperature of 25°C. Below those temperature it is
recommended adjusting voltage threshold at +/- 30mV per degree.
Ex.: Ambient temperature of 35°C = 35°C – 25°C x 0,003V = voltage must be reduced by 0.03V.
A constant current of 25% of the capacity is
recommended until the equalization voltage is reached.
At the end of this step, the battery is charged at 80-
90%.
The voltage of the battery reaches its equalization
voltage and it is stabilized. The current is reducing.
The battery is charged. Charging voltage is reduced
and a low current must be delivered in order to
offset the battery self-discharge.
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