Campbell Met One 034A-L Manual del operador descargar pdf (Pagina 35)

Manual

Power Supply

Given this individual SoC-OCV relation, the user can now assess the SoC of a known lead acid battery. To this end,

follow the below instructions:

• Disconnectthebatteryfromtheloadand/orcharge;

• Ifthebatteryisbeingchargedordischarged,wait20minutesforthebatterytostabilize;

• Contactthevoltmeter’sleadtothepositiveandnegativeterminalsofthebattery,andreadthevoltage;

• ComparethereadingtoindividualSoC-OCVrelationfortheparticularbattery.

Never discharge a sealed lead acid gel batteries below 40% SoC as this may negatively affect the life span of the

battery.

To keep track of their performance and state, each battery should be numbered and marked and an individual log

should be kept, indicating:

• Dateofpurchase/delivery;

• InitialOCV;

• DatesofchargeandOCVinfullychargedstate;

• Periodofuseincludingnameofstationandaverageload;

• SoCandOCVatendofperiodofuse;

• Irregularities/remarks.

Annex 6 presents a sample form for a battery log.

Always make sure that the log is kept accurately. A duly kept logbook is invaluable in assessing the condition and

state of a battery. It will indicate if a battery is reaching the end of its life span and needs to be disposed of and

replaced. Timely replacement will ensure continuous station operation, without unexpected power failures, which

may result in data loss, or worse, damage to the equipment.

METSTAT also includes a routine for measuring the battery voltage on a daily basis. However, the user cannot

easily evaluate this information while on site, as it requires some data processing. Instead, these battery voltage

recordings need to be examined after transfer of the data to the office PC. The reader is referred to Annex 6 for

detailed guidelines for assessing battery performance using the daily voltage record.

The measurement schedule of the Met Station results in an average power drain of 1.14 mA. In case of the unlikely

situation without external power, this would discharge a fully charged 7Ahr battery to a SoC of 80% after 50 days.

Such situation could occur when the solar panel fails or get disconnected, or when the charging unit malfunctions. A

discharge below a SoC of 80% will negatively affect the life expectancy of the battery. It is therefore advised to follow

the below guidelines:

• Visitthemeteorologicalstationonamonthlybasis;

• Visuallycheckifallwiresareconnectedproperly,andifallcontactsarecleanandnotcorroded;

• ConnecttheCR10KDKeyboardandcheckthestateofthebatteryusing“star-six”mode;inputlocation23is

assigned to battery voltage;

• IfthevoltageisbelowtheinitialOCVminus0.05volt,aproblemhasoccurredwiththepowersupply;check

the performance of the solar panel and regulator; make sure to identify and fix the problem;

• Ifthevoltageisbelow12.5volt,replacethebatterywithafullychargedone;

• TakethebatterytotheOfficeandimmediatelyrechargeitslowlywiththeCH12Rchargingunit;followthe

instructions under ‘recharge’.

4.2.4 Recharge

If the SoC of a battery falls below 80%, it should be returned to the office for recharge. Proper recharge will

significantly increase the life span of the battery, while improper recharge can destroy it. The user is therefore

advised to carefully read the guidelines in this paragraph.

Overcharging a sealed (captive) electrolyte battery will cause loss of electrolyte and will strongly reduce battery life.

Moreover, overcharging may lead to the formation of dangerous levels of highly explosive hydrogen gas. Likewise,

fast charging greatly reduces the life of the battery by quickly lowering the level of electrolyte in the cells, herewith

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Campbell Met One 034A-L Manual del operador Pagina 35

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