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  • 万博max官网手机版_万博博彩苹果app下载_新万博manbetx手机版登录
        发布时间: 2015-12-14 15:41    
    The Daystar solar meter provides an accurate reading (3%) from 0 - 1200 Watts/m2 when they are pointed at the sun. Resolution is 1 W/m2, maximum display reading is 1999. The irradiance value is presented on a 0.75" easy-to-read LCD display. The meter is (2.5" x 4.5" x 1.0" inches) (6.4 x 11.4 x 2.5 cm) and weighs (less than 5 ounces) (140 g) with the 9-V battery installed.
  • 光强感应器件:
    PV Sensor: The meter uses a polycrystalline silicon PV cell as the sensor. The cell is
    mounted on the top end of the meter, perpendicular to the display. The sensor responds to a
    spectum bandwidth of approximately 0.3-1.1 microns. A generic spectrum for a silicon PV
    cell show as below. The meter is intended for outdoor measurements of natural sunlight. The
    PV sensor is located behind a plastic diffuser.
    经过一级计量校准:
    Meter Calibration: Meters are calibrated on clear days in natural sunlight and adjusted to a
    reference cell periodically calibrated with pyranometers at Sandia National Laboratories.
    Meters are pointed directly at the sun for calibration with the plastic protection cover in place.
    Off-angle calibration is not done. However, empirical data indicate meter-to-meter
    performance remains consistent up to 40 degrees off-angle from the direct normal. Beyond
    40 degrees the readings start to diverge and may reach 10 - 15% when pointed 70-80 degrees
    away from the sun. The meters are calibrated in groups and records for individual meters are
    not maintained.
    使用注意事项:
    Care of your Meter: The meters are designed for use in the field but you should treat them
    as you would your voltmeter; avoid dropping them, do not leave them out in the rain. They
    are not sealed for continuous exposure to weather. The LCD display may darken if exposed
    to direct sunlight for a prolonged period.
    售后维护:
    Meter Repair: We stand behind our products. If your meter is damaged or malfunctions,
    contact Daystar for instructions about repair or return. A repair charge may may assessed if
    your meter is more than one year old.
    如何计算整个电站的辐照量:
    Using Your Meter:The Daystar solar meter measures instantaneous solar power and provides the reading
    in Watts per square meter. You can calculate the total power striking the PV array by multiplying the area
    of the active PV material by the reading from the meter. You can estimate the output power from the PV
    array for that condition by multiplying by the advertised module efficiency. You would have to adjust that
    value for losses, temperature effects, inverter efficiency, etc., to obtain the actual system output. More
    information is available as a .pdf download here.

    光谱响应曲线
    Light Spectrum
    The Daystar meter PV cell sensor responds to light from approximately 500 to 1100 nanometers, show as
    above.
    测试仪操作指南,步骤如下:
    Do the following:
    • Hold or place the Daystar solar meter in the same orientation as the PV array.
    Record the reading of irradiance (solar power) in Watts per square meter.
    Note: If possible, a PV array should be tested on a clear day around solarnoon.
    • Consult the PV module specification to determine the area of the PV array.
    This should be the “active area” of the PV cells excluding the frame of the
    PV modules. Calculate the active area in square meters.
    • Multiply the irradiance reading and the active area to get total solar power
    striking the the array at that instant, the input power (Watts).
    • Consult the PV module specifications to determine the conversion efficiency
    of the PV modules used in the array.
    • Multiply the input power by the efficiency to estimate the power the array
    could produce under existing conditions.
    • In most instances, this number will be greater than the output power
    because losses and temperature effects have not been considered.

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