31
Select such battery types as LI, and select the system voltage from
12V/24V.
As shown in Fig. 18-2, the charging stages of lithium battery are:
MPPT charging/boost charging/current-limiting charging.
[MPPT charging] When the battery voltage does not reach the target
constant voltage value, the controller conducts MPPT charging to
charge the battery with maximum solar power, when reaches, it
automatically switches to boost charging.
[Boost charging] In the boost charging stage of lithium battery,
when the battery voltage is lower than the boost charging voltage,
the system conducts MPPT charging or current-limiting charging,
when reaches, it switches to boost charging.
18-2: Charging of lithium battery
Charging voltage
Charging current
Boost charging voltage
MPPT
Constant voltage
charging
Time
Time
Fig. 18-2 Charging curve of lithium battery
3) Excessive charging and excessive gas evolution may damage the
battery plate and cause the active substances on the battery plate to
fall off.Besides, excessive high equalizing charging voltage or
excessive long equalizing charging duration may damage the
battery. Please set relevant parameters according to the specifica-
tions of the battery used in the system.
[Boost charging] The duration of boost charging is 2 h (default).
When the duration reaches the set value, the system will switch to
floating charging.
[Floating charging] Floating charging is the last constant voltage
charging stage in the charging cycle of lead-acid battery. The
controller keeps the charging voltage constant at the floating
charging voltage. At this stage, the battery is charged with a very
weak current to ensure that the battery is in full-charging. When the
battery voltage is as low as the reconnect voltage of boost charging,
the system will exit the floating charging stage and re-enter the next
charging cycle.
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