MPPT charge controller User Manual
3.4 Preparation Before Wiring
3.4.1 PV Array Preparation
Each SP must be connected to its own PV array. Please find following maximum PV array can be
connected under various DC systems.
Table 3-2 PV allowance for SP
SP100-40 SP100-20 SP50-40 SP50-20
Max. open circuit
voltage(VDC)
100 100 50 50
Max. short circuit
current (A)
Normal operation:40A
PV polarity reversed:20A
20 20 20
Max. PV
input power
12VDC 600W 300W 560W 300W
24VDC 1200W 600W 1200W 600W
48VDC 2400W 1200W NA NA
The Voc of PV array must never exceed 100 ;The PV array Isc must not exceed 20A
when PV polarity is reversed.
The Voc or Vmpp of solar panel was rated at 25℃ with normal weather condition. Along
with temperature reduced, the Voc/Vmpp of solar array will increase. Please consult with
PV manufacturer for Voc/Vmpp of the lowest possible environment temperature and
making sure it is below 100VDC for SP100 and 50VDC for SP50.
3.4.2 Breaker Preparation
An over current protection devices DC fuse or DC circuit breaker needs to be installed on
positive cable, of which rated for 125% of the nominal rating.
The voltage resistance of DC circuit breaker on the battery side should be greater than 63V.
Voltage withstand of PV array side DC circuit breaker should be greater than PV open circuit
voltage.
Circuit breaker requirements are shown in the Table 3-3
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