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4.0 Operation
4.1 MPPT Technology
The eTracer 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. eTracer 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, eTracer MPPT technology will ‘boost’ the solar charge current. For
example, a system may have 8 Amps of solar current flowing into the eTracer and 10
Amps of charge current flowing out to the battery. The eTracer does not create current!
Rest assured that the power into the eTracer is the same as the power out of the
eTracer. Since power is the product of voltage and current (Volts×Amps), the
following is true*:
(1) Power Into the eTracer =Power Out of the eTracer
(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
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