User Manual

(1) Serial connection (string) of PV modules
As the core component of solar system, controller could be suitable for various
types of PV modules and maximize converting solar energy into electrical energy.
According to the open circuit voltage (Voc) and the maximum power point voltage
(VMpp) of the MPPT controller, the series number of different types PV modules
can be calculated. The below table is for reference only.
Select the system cables according to 5A/mm2 or less current density in
accordance with Article 690 of the National Electrical Code, NFPA 70.
MY20/MY30/MY40:
12V 4 2 2 1 2 1 2 1
24V 4 3 2 2 2 2 2 2
36 cell
Voc＜23V
48 cell
Voc＜31V
54 cell
Voc＜34V
60 cell
Voc＜38V
Max Best Max Best Max Best Max Best
System
voltage
12V 2 1 1 1 1
24V 2 1 1 1 1
72 cell Voc＜46V
96 cell Voc＜62V
Max Best Max Best
System
voltage
Thin-Film Module
Voc＞80V
NOTE: The above parameter values are calculated under standard test conditions
(STC (Standard Test Condition)：Irradiance 1000W/m2，Module Temperature 25
℃，Air Mass1.5.)
01 02 03 04 05 06 07
08 09 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36
(2) Maximum PV array power
The MPPT controller has the function of charging 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 range, 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:
2.2 PV Array Requirements