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Global Power Technologies 13
S-8500
4.2 POWER UNIT POWER CURVE
The Thermoelectric Generator converts heat to direct current electricity via a thermopile
power unit. This power unit has a fixed internal resistance in a range of 1.0 to 1.3 Ohms.
The maximum power is delivered when the load resistance closely matches that of the
power unit. Voltage and current can be plotted together to show a power curve for the TEG.
WARNING: Do NOT adjust the device outside of the absolute maximum
ratings as listed in Appendix B. Increasing fuel pressure or output power
beyond these limitations will result in damage to the power unit, additional
cost to the customer, the TEG being out of service for a period of time, and
possible injury.
The amount of power that can be drawn from the TEG is primarily dependent on the heat
input and the cooling system. The heat input is fixed via combustion of fuel and the cooling
is provided by the fin base, fins and fin duct, all of which work together. Cooling is affected
by ambient temperature, humidity, wind and altitude.
The following chart shows the gross power output of the thermoelectric power unit prior to
power conditioning and without consideration of ambient conditions.
Ambient temperature
As temperature increases Power output will drop by about 1.4 W per
o
C above 25
o
C. This
is important when setting up the TEG or checking performance as the maximum power that
can be achieved will vary. The following chart should be used to determine the expected
maximum power under the given ambient temperature condition.
Figure 4 Thermoelectric Power Unit Power Curve
350.0
400.0
450.0
500.0
550.0
600.0
650.0
10
15
20
25
30
35
40
0.10
1.00
Po
wer
(W)
Vo
ltage
(V)
Cu
rrent
(A
)
Load
Resistance
(
Ω
)
0.30
0.60
3.00
5.00
64263 REV1
Summary of Contents for S-8500
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Page 63: ...Global Power Technologies 57 S 8500 Figure 29 CP Panel wiring schematic ...
Page 65: ...Global Power Technologies 59 S 8500 Figure 30 DC DC Converter Connections ...
Page 66: ...Global Power Technologies 60 S 8500 Figure 31 DC DC Converter with CP Panel wiring schematic ...
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