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Installation, Operation and Maintainance of Automatic Meteorological Stations

Power Supply

4.3.4 Maintenance

The MSX10 Solar Panel requires a minimum of routine maintenance. The following is recommended:

• Toimprovethepanel’sefficiency,cleantheglassplateduringeachvisitwithasoft,lightlymoistenedcloth.

Do not use any abrasive pad or cleaner, as this may permanently scratch the glass. Please keep in mind that a dust

cover on top of the module is reducing power output.

• Makesurethatnopartofthepanelisshadedorcoveredwhiletherestofthepanelisexposedtosunlight,

as this can permanently damage the unit. Remove tree branches that may shade the panel or provide a source for

leaves. Remove plants and trees that grow up around the tripod.

• Measurethevoltageoutputofthepanelifaproblemisexpected(forinstancebecauseofsteadydischarge

of the battery under normal climatic conditions). Obviously, this test requires incident solar radiation. It also needs

a load attached to the solar panel, which can be simulated with (a) a 75-ohm resistor cable, or (b) connection to the

PS12-LA while the station is in operation. The panel is damaged if no voltage output is measured.

• Checkoccasionallyforloosenutsinthemountinghardware.

4.3.5 Trouble Shooting

Problem 1: Battery is discharging steadily in spite of recent sunny periods.

Remedy 1.1: Clean the solar panel.

Remedy 1.2: Check if all wires are connected properly.

Remedy 1.3: Check if incoming solar radiation is not obstructed; remove obstructions.

4.4 Charging Unit

4.4.1 General

The regulator/charging unit of the PS12-LA power supply has three primary functions:

1. To provide a central connecting point for the solar panel, the datalogger, and the battery;

2. To manage the power supply to the datalogger, and to protects the battery from overcharge, fast charge, and

deep discharge;

3. To allow the user to monitor the system and locate potential system problems.

As indicated in paragraph 4.2.4, deep discharge, overcharge, or fast charge strongly reduces the life span of a

battery. To avoid these conditions, the regulator monitors the state of the battery, regulates the recharge current,

and limits the power drain to within an acceptable range. Hence the charging unit/regulator plays an important role

in safe guarding the system. Failure of this device often results in malfunctioning of other components of the Met

Station.

4.4.2 Installation

Installing the charging unit/regulator requires only limited user actions, as this component is integrated into the

PS12-LA power supply. The regulator itself is presented in Figure 12.

Similar to the instruction in paragraph 4.3.2, insert the leads from the solar panel into the terminals labeled CHG;

polarity does not matter. Connect the battery by plugging the battery connector in the terminal labeled INT.

Connection of the charging unit/regulator to the datalogger is described in paragraph 2.2.

4.4.3 Use

Operation of the charging unit/regulator is almost completely automatic. User intervention is limited to toggling the

power to the datalogger On/Off.

A red light (LED) indicates when a charging source is connected to the charging unit/regulator.

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Campbell Met One 034A-L Betreibershandbuch Seite 38