ACOPOWER Midas Y Series User Manual page 8

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 100V (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 100V (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 system reasonably. For the recommended maximum power of PV
array for this controller, please refer to the table below:
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