Boost Tracer Instruction Manual download pdf (Page 10)

4 Operation

4.1 MPPT Technology

The Tracer-BN series utilizes Maximum Power Point Tracking technology to extract

maximum power from the solar module (s). The tracking algorithm is fully automatic

and does not require user adjustment, Tracer-BN series technology will track the array

maximum power point voltage (Vmp) as it varies with weather conditions, ensuring that

maximum power is harvested from the array through the course of the day.

· Current Boost

In many cases, Tracer-BN series MPPT technology will ―boost‖ the solar charge current.

For example, a system may have 8 Amps of solar current flowing into the Tracer-BN

series and 10 Amps of charge current flowing out to the battery. The Tracer-BN series

does not create current! Rest assured that the power into the Tracer-BN series is the

same as the power out of the Tracer-BN series. Since power is the product of voltage

and current (Volts×Amps), the following is true*:

(1) Power Into the Tracer-BN series =Power Out of the Tracer-BN series

(2) Volts In×Amps In=Volts Out×Amps Out

* Assuming 100% efficiency. Actually, the losses in wiring and conversion exist.

If the solar module’s Vmp is greater than the battery voltage, it follows that the battery

current must be proportionally greater than the solar input current so that input and

output power are balanced. The greater the difference between the maximum power

voltage and battery voltage, the greater the current boost. Current boost can be

substantial in systems where the solar array is of a higher nominal voltage than the

battery.

· An Advantage Over Traditional Controllers

Traditional controllers connect the solar module directly to the battery when

recharging. This requires that the solar module operate in a voltage range that is below

the module’s Vmp. In a 12V system for example, the battery voltage may range from

11-15Vdc but the module’s Vmp is typically around 16 or 17V.

Figure 4-1 shows a typical current VS. voltage output curve for a nominal 12V

off-grid module.

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Boost Tracer Instruction Manual Page 10