Installation Guide

4-1-4. Float charging

The third charging stage occurs at the end of the absorb charging time. While final charging, the charge

voltage is reduced to the final charge voltage (determined by the Battery Type selection*). In this stage,

the batteries are kept fully charged and ready if needed by the inverter. The Float Charging stage

reduces battery gassing, minimizes watering requirements (for flooded batteries), and ensures the

batteries are maintained at optimum capacity.

4-1-5. Equalization charging

The intent of this charging procedure is active between abs and final is to remove sulfation that formed

as a result of the batteries being undercharged.

Another objective is to bring all cells to an equal state of charge. While Equaliztion charging，the charge

voltage increase to 14.1V continue a cycle is 240 minute(automatic shutdown). The frequency of the

equalizing charge is something that each battery manufacturer differs on. For example, some will

recommend be applied every month or every ten cycles, while another will recommend every six months

or every 20 cycles.

4-1-6. Temperature compensated charging

The unit is delivered with a battery temperature sensor. By installing this battery temperature sensor the

charge voltages are automatically adapted for deviating temperature.

With a BTS (battery temperature sensor) installed, if the temperature around the BTS is below 20°C the

absorb and float charge voltage increases, and if the temperature around the BTS is higher than 20°C,

the absorb and float charge voltage decreases. See Fig.10 to determine how much the charge voltage

changes (increases or decreases) depending on the temperature reading of the BTS. For example, the

nominal absorb charge voltage for a flooded battery at 20°C on a 12-volt model is 14.6 VDC. If the

battery temperature is 35°C, the absorb charge voltage would decrease to 14.225 VDC (14.6 - 0.375 ). If

the temperature sensor is NOT installed, the charge voltages will not be automatically adjusted by

temperature, but will be maintained at a temperature of 20°C. The life of the batteries may be reduced if

they are subjected to large temperature changes when the BTS is not installed.

Fig. 10

：

Temperature compensation using BTS