Instruction Manual

Table Of Contents

Maximum Power Point Tracking

975-0400-01-01 Revision H 1–3

This manual is for use by qualified personnel only.

• Over-temperature protection and power derating when output power and

ambient temperature are high.

• Battery Temperature Sensor (BTS) to provide automatically temperature-

compensated battery charging. If the BTS is lost or damaged, a replacement

can be ordered from Schneider (part number 808-0232-02).

• Xanbus communications network. Xanbus is a network communications

system developed by the manufacturer which allows the solar charge

controller to communicate settings and activity to other Xanbus-enabled

devices.

• Five-year limited warranty.

Maximum Power Point Tracking

Maximum Power Point Tracking enables the solar charge controller to harvest the

maximum energy available from the PV array and deliver it to the batteries.

The MPPT algorithm continuously adjusts the array operating voltage so that the

array continuously operates at its maximum power point.

The solar charge controller applies a variable charging load on the array—shown

by the power curve (solid line) in Figure 1-2—until it finds the maximum wattage

(the point at which both operating voltage and current can be maximized at the

same time), as indicated by “MPP” in Figure 1-2. The solar charge controller then

holds the array at this point for as long as the array continues to produce the

maximum power possible. As panel shading, cloud cover, and sunlight angle

shift, the solar charge controller finds the new maximum power point without

interrupting its output power flow.

Figure 1-2 Maximum Power Point Curve

Current (I) Amps

0102030405060708090

Voltage (V) Volt s

MPP