Outback Power Systems GS8048 manual Equalization, Battery Temperature Compensation

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Operation

The Absorption timer continues this behavior even if the charger is still on. For example, if the charger is in Float stage and there is a significant battery drain, the charger may not be able to maintain the batteries at the Float voltage. Once the batteries fall below the Rebulk point, the Absorption timer will begin accumulating time. (However, the accumulation will be minor, as this will also cause the charger to re-enter the Bulk stage.)

The timer will stop incrementing when it reaches the Absorb Time setting. This is the maximum duration of the Absorption stage. This means that regardless of the voltage, the timer will always run for the full Absorption period if the batteries dropped below the appropriate voltage for that amount of time. If significant battery drain caused the batteries to drop below the set points for doubling or quadrupling the rate, the charger may run for the full Absorption period even after a lesser amount of time.

The rest of the charging stages will proceed as described on the previous few pages.

Equalization

Equalization is a controlled overcharge that is part of regular battery maintenance. Equalization brings the batteries to a much higher voltage than usual and maintains this high voltage for a period of time. This has the result of removing inert compounds from the battery plates, and reducing stratification in the electrolyte.

Equalization follows the same pattern as standard three-stage charging, as shown in the figures on page 21. However, instead of the Absorption voltage and time set points, it is controlled by the Equalize Voltage and Equalize Time settings in the MATE3.

This process must be started manually using the MATE3. The inverter cannot be programmed for automatic battery equalization. This is a safety measure.

Equalization is normally performed only on flooded lead-acid batteries. The schedule for equalization varies with battery use and type, but it is usually performed every few months. If performed correctly, this process can extend battery life by a considerable amount.

Equalization is not normally performed on nickel-technology batteries or any sort of sealed battery.

CAUTION: Battery Damage

Do not equalize any sealed battery types (VRLA, AGM, Gel, or other) unless approved by the manufacturer. Some batteries may suffer severe damage from equalization.

Contact the battery manufacturer for recommendations on equalization voltage, duration, schedule, and/or advisability. Always follow manufacturer recommendations for equalization.

Battery Temperature Compensation

Temperature compensation is a process that corrects for changes in battery performance caused by varying temperature.

When batteries are cooler than room temperature (77°F or 25°C), the electrolyte reaction slows down. This causes the battery to accept charging energy less readily. Delivering the usual amount of energy that would fully recharge a battery at room temperature will undercharge a cool one.

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900-0020-01-00 Rev A

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Contents Radian Series Inverter/Charger GS8048Trademarks Definitions Symbols UsedAudience Terms and DefinitionsGeneral Safety Important Safety InstructionsTable of Contents List of Figures Table of ContentsList of Tables Introduction MATE3 System Display and Controller Functional Test Pre-startup ProceduresCommissioning StartupAdding New Devices Powering DownFirmware Updates CommissioningGenerator OperationInput Modes Support OperationGrid Tied UPS Uninterruptible Power Supply Backup Mini GridOperation Functions InvertingSearch InputAC Current Settings AC Source AcceptanceTransfer Offset No Charging Battery ChargingCharging Steps Bulk StageOffset Charging Stages Over Time1Float Stage Float TimerSilent Repeated SilentNew Absorption Stage Absorption TimerNew Charging Cycle Battery Temperature Compensation EqualizationExamples Multiple-Inverter Installations Stacking OutBack HUB4 and MATE3Example of Parallel Stacking Arrangement Three Inverters Power Save Levels Auxiliary Terminals Operation Operation Advanced Generator Start AGS High Battery TransferSystem Display-Based Functions Grid Use TimeTroubleshooting Symptom Possible Cause Possible Remedy TroubleshootingBasic Troubleshooting Symptom Possible Cause Possible Remedy TroubleshootingTroubleshooting Hot or neutral Not be bonded Inverter may be behaving correctly Inverter output is being fed Troubleshooting Error Messages Error Troubleshooting Message Causes Possible RemedyMessage Definition Possible Remedy AC Freq Too HighCapacitors Disconnect Messages Voltage MaximumSell Status Definition Sell StatusSell Status Messages Troubleshooting Electrical Specifications for Model GS8048 Value SpecificationsSpecifications for Model GS8048 Mechanical Specifications for Model GS8048Specifications Environmental SpecificationsRegulatory Specifications Environmental Specifications for All Models ValueFirmware Revision Default Settings and RangesGS8048 Inverter Settings Field Default Minimum Maximum OutBack Power Technologies Product RegistrationExtended Warranty Product RegistrationWarranty Year Limited Warranty for Radian ProductsReturn Material Authorization RMA How to Arrange for Warranty ServiceTroubleshooting WarrantyOut of Warranty Returning Product to OutBackThis page Intentionally Left Blank Year Warranty IndexIndex Input Modes 11, 17, 20, 22This page Intentionally Left Blank