28142 Rev 15 POWER OUTPUT EVALUATION
Gentherm Global Power Technologies Page 37
A good approximation to V
set
and rated power can be obtained from the chart shown in Figure
20. Knowing the ambient temperature, move up vertically to the line. Read the V
set
from the
right side of the graph and rated power from the left side.
Figure 20 – V
set
and Gross Power vs Ambient Temperature (Beginning of Service Life)
To determine the electrical power that the generator is producing, a precision resistor is
provided within the generator. This resistor is called the V
set
resistor, or precision load. By
connecting the generator to this resistor and measuring the voltage across it, the power
produced by the generator can be calculated as follows:
Equation 3 =
Where: P = Power (Watts)
V
set
= Setup Voltage (Volts)
Power output is calculated from V
set
by squaring the measured voltage. Similarly, setup
voltage can be calculated by taking the square root of the target power.
V
set
voltage is measured across terminals 2 and 4 on TB1, with the TEG in SETUP configuration
(jumper clip in the setup position across terminals 2 and 3 on TB 1, as shown in Figure 13
and Figure 14) .
180
190
200
210
220
230
240
250
260
-40 -30 -20 -10 0 10 20 30 40 50 60
13.00
13.50
14.00
14.50
15.00
15.50
16.00
16.50
AMBIENT TEMPERATURE °C
RATED V
SET
VOLTAGE (VOLTS)
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