PDF Spec sheet

VARIABLES AFFECTING PERFORMANCE
The performance of typical MEGA SX-64 and -60
modules is described by the I-V curves and electrical
characteristics table on the next page. Each module’s
actual, tested output characteristics are printed on
its label.
The current and power output of photovoltaic
modules are approximately proportional to illumi-
nation intensity. At a given intensity, a module’s out-
put current and operating voltage are determined by
the characteristics of the load. If that load is a battery,
the battery’s internal impedance will dictate the
module’s operating voltage. An I-V curve is simply
all of a module’s possible operating points (voltage/
current combinations) at a given cell temperature
and light intensity. Increases in cell temperature
increase current but decrease voltage.
TYPICAL ELECTRICAL CHARACTERISTICS
(1)
12 VOLT CONFIGURATION
(2)
MSX-64 MSX-60
Typical peak power (P
p
) 64W 60W
Voltage @ peak power (V
pp
) 17.5V 17.1V
Current @ peak power (1
pp
) 3.66A 3.5A
Guaranteed minimum peak power 62W 58W
Short-circuit current (1
sc
) 4.0A 3.8A
Open-circuit voltage (V
oc
) 21.3V 21.1V
Temperature coefficient of
open-circuit voltage . . . . . – (80±10)mV/ºC . . . . .
Temperature coefficient of
short-circuit current . . . .(0.065±0.015)%/ºC . . .
Approximate effect of
temperature on power . . . . . – (0.5±0.05)%/ºC . . . .
NOCT
(3)
. . . . . . . . . 49ºC . . . . . . . . .
Notes:
(1) These data represent the performance of typical modules as
measured at their output terminals, and do not include the effect
of such additional equipment as diodes and cabling. The data are
based on measurements made at Standard Test Conditions (STC),
which are:
• Illumination of 1 kW/m
2
(1 sun) at spectral distribution of AM 1.5
• Cell temperature of 25°C or as otherwise specified (on curves).
(2) Electrical characteristics of modules wired in the nominal 6V
configuration may be found by using the 6V scales on the I-V
curves. For more exact values, divide the 12V voltage characteristics
in the table by 2 and multiply the 12V current characteristics by 2.
Power values are unchanged.
(3) Under nearly all climatic conditions, the solar cells in an operating
module are hotter than the ambient temperature, a fact which
must be considered when reading module data. NOCT (Nominal
Operating Cell Temperature) is an indication of this temperature
rise, and is the cell temperature under Standard Operating
Conditions: ambient temperature of 20ºC, solar irradiation of 0.8
kW/m
2
, and average wind speed of 1 m/s.
I-V CHARACTERISTICS