AMC pm-scc-80 am ユーザーズマニュアル

 

1-1

 

The Premium MPPT Series plays a major role in planning your PV system. The first 

step in planning an efficient PV system is to calculate the load requirement. In order 

to calculate the anticipated load requirement, it is important to determine average and 

peak load consumption. The possible load growth should also be taken into 

consideration when planning the load requirement because loads hardly remain static 

and they grow more frequently than they reduce.   

 
1.2 Battery Voltage System 

After the estimate of the power requirement, the required power from the battery will 

be the next consideration in planning the system. According to the basic rule of the 

electricity, “Current is the power divided by voltage”, when the power amount 

increases, it is suggested to raise the battery voltage so the current amount will 

decrease. The principle is based on the larger amount of current is, the more expensive 

the circuit protection is. In an example of the 96 watt load, it draws 4 amps at 24V 

battery system but it draws only 2 amps at 48V system.   

 

As the Premium MPPT Series is a smart DC to DC converter design, the specification 

of a PV array is much like sizing a grid tie inverter. Installers choose the max. and min. 

Vmp and Voc of each string and how many strings are needed. 

 

The maximum operating voltage of the PM-SCC-50AM and PM-SCC-80AM is 140 

Vdc and of the PM-SCC-40AMW and PM-SCC-80AMW is 240Vdc. The protection 

will be active to shut down the unit when the operating voltage is higher. PV array 

manufacturers has the published data sheet with rated voltage and current as well as 

the current and temperature coefficients. The rated Voc is measured in the temperature 

of 25℃ so when calculated at lower temperature such as 0℃, 25% increase of the 

rated Voc is expected. At different temperature location of installation, the maximum 

Voc of the module should be determined by the Voc voltage temperature coefficient 

and after that, a series string voltage may be determined as well.