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eSure™ MPPT Solar Converter Module User Manual (UM1S482000E3)
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Rev. J
9
INTRODUCTION
Overview
The MPPT Solar Converter provides load power, battery float current, and battery recharge current during
normal operating conditions. The solar converter is a constant power design. The solar converter is rated at its
maximum output power. This means that, within the normal operating ambient temperature range and input
voltage range, the maximum available output power is a constant 2000 W. Within these ranges, the solar
converter operates in one of three modes, depending upon load demands. Transition between modes is
completely automatic. If ambient temperature rises above or input voltage falls below acceptable values, the
solar converter continues to operate but at derated output power levels.
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Constant Voltage Mode: For any initial output voltage setting from 42 VDC to 58 VDC, output voltage
remains constant regardless of load. This is the normal operating condition, in which loads are being
supplied and batteries are float charged. Solar converters operate in the Constant Voltage Mode unless
load increases to the point where the product of load current and output voltage is approximately
2000 W.
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Constant Power Mode: As load increases above approximately 2000 W (non-adjustable), output current
continues to increase, but output voltage decreases as required to maintain constant output power.
Solar converters operate in the Constant Power Mode unless load continues to increase to the point
where the current limit setting is reached.
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Constant Current Mode: If load increases to the current limit setting, output voltage decreases linearly
to maintain output current at the current limit setting.
Specifications
DC Output Ratings
NOTE!
A current limitation can be set by the User and the output voltage level is set through the
controller.
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Voltage: Nominal -48 VDC, positive ground. Output voltage is adjustable from -42 VDC to -58 VDC via
the associated controller.
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Output Power and Current: 2000 W (41.7 A) @ 200 VDC to 420 VDC input and -48 VDC output.
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Output Characteristics: Refer to
for a graph of output voltage vs. output current.
Figure 1:
Output Voltage vs. Output Current
0
10
20
30
40
50
60
0
5
10
15
20
25
30
35
40
45
O
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ut
V
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tag
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(V
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Output Current (A)
Output Voltage vs. Output Current at Max. Power