NOTE: The above parameter values are calculated under standard test conditions (STC (Standard Test
Condition)：Irradiance 1000W/m2, Module Temperature 25℃, Air Mass1.5.)
(2) Maximum PV array power
The MPPT controller has the function of current/power-limiting, that is, during the charging process, when the
charging current or power exceeds the rated charging current or power, the controller will automatically limit
the charging current or power to the rated charging current or power, which can effectively protect the charging
parts of controller, and prevent damages to the controller due to the connection of some over-specification PV
modules. The actual operation of PV array is as follows:
Condition 1:
Actual charging power of PV array ≤ Rated charging power of controller
Condition 2:
Actual charging current of PV array ≤ Rated charging current of controller
When the controller operates under "Condition 1" or "Condition 2" , it will carry out the charging as per the
actual current or power; at this time, the controller can work at the maximum power point of PV array.
WARNING: When the power of PV is not greater than the rated charging power, but the maximum
open-circuit voltage of PV array is more than 200V(at the lowest environmental temperature), the
controller may be damaged.
Condition 3:
Actual charging power of PV array＞Rated charging power of controller
Condition 4:
Actual charging current of PV array＞Rated charging current of controller
When the controller operates under "Condition 3" or "Condition 4", it will carry out the charging as per the
rated current or power.
WARNING: When the power of PV module is greater than the rated charging power, and the maximum
open-circuit voltage of PV array is more than 200V(at the lowest environmental temperature), the
controller may be damaged.
According to "Peak Sun Hours diagram", if the power of PV array exceeds the rated charging power of
controller, then the charging time as per the rated power will be prolonged, so that more energy can be
obtained for charging the battery. However, in the practical application, the maximum power of PV array
shall be not greater than 1.5 x the rated charging power of controller. If the maximum power of PV array
exceeds the rated charging power of controller too much, it will not only cause the waste of PV modules, but
also increase the open-circuit voltage of PV array due to the influence of environmental temperature, which
may make the probability of damage to the controller rise. Therefore, it is very important to configure the
