Outback Power Systems 80 user manual Typical Array Sizing Guide

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27. Typical Array Sizing Guide

Below is a list of recommended array sizing for the FLEXmax 80 for various nominal voltage batteries:

Nominal Battery Voltage	Recommended Array Size
	(in watts, Standard Test Conditions)
12V	1250W
24V	2500W
36V	3750W
48V	5000W
60V	6250W

The FLEXmax 80 PV MPPT Charge Controller is capable of an input open circuit voltage (VOC) of up to 150 VDC. Cooler climates can cause the VOC to rise above the panel VOC rating. In climates that observe temperatures less than approximately 5° F, a VOC greater than 125 VDC is not recommended.

When sizing an array, it is recommended that the nominal array voltage be higher than the nominal battery voltage. Below is a list of recommended nominal array sizing:

Nominal Battery Voltage	Nominal Array Voltage (recommended)
12V	24V (or higher)*
24V	36V (or higher)*
36V	48V (or higher)*
48V	60 V (or higher)*
60V	60V (low temp is less than 5°F) or
	72V (low temp is greater than 5°F)

*When sizing an array to charge controller with a distance of 70 feet or greater, OutBack recommends the nominal array voltage be slightly higher than the recommended nominal array voltage. Example: A 36VDC nominal array recharging a 12V nominal battery with an array to charge controller distance of about 70 feet or greater. Sizing the nominal array voltage higher than the nominal battery voltage ensures that the Maximum Power Point is always above the battery voltage. The Maximum Power Point will decrease as the panels warm up, thus lowering the output of the array. The FLEXmax 80 Charge Controller will not be able to boost the output if the Maximum Power Point of the array is at or lower than the battery voltage.

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Contents User’s Guide Warranty Summary Dear OutBack CustomerAbout OutBack Power Systems DisclaimerDate and Revision Contact InformationTable of Contents Product Registration and Optional Extended Warranty FLEXmax 80 Maximum Power Point Tracking Charge Controller ScopeIntroduction FirmwareStandards and Requirements Personal Precautions During Installation Outback Power Systems FLEXmax Mounting to Plywood Installing the FLEXmax 80 FLEXware DC EnclosuresDC Enclosure FLEXmax Bushing Locknut Conduit Nipple Wire and Disconnect Sizing Determining Wire SizesOpen Circuit Voltage/Wire and Disconnect Size FLEXmax 80 Wiring Connections FLEXmax 80 wiring compartmentPage Page Page How to Read the FLEXmax 80 Screen Diagrams Soft keysPower Up Screen Powering UpOutBack12V Power Systems FLEXmax Password Contrasena Select Version Elija la VersionUSA Next Enter Entra SEL 150Sytem Voltage USA NoyesEnter Status Screen AUX OFFRecharging Using the PV Array End of Day Summary ScreenCharger Aux Light EQ Misc Advanced Logging Stats Accessing the Main MenuExit F G GO Charger Set-Up Current Limit80.0A Absorbing 14.4V Float 13.8VAUX Mode and Its Functions AUX ModeExit Next SET Mode Night Light Output OffAUX Mode Menu Path Pressing the Next soft key scrolls through the AUX functionsAUX modes in order of appearance on the FLEXmax 80 display Programming the AUX Modes OffVent Fan Exitvolt Vent FAN VoltsExit Volt Exit Next SETPV Trigger Output Off Fan screenOutput On PV TriggerExit Time Volt PV Volts Exit Time VoltHold Time Sec 01.1 Back + Press the Next soft key to view the Error Output screenPV Trigger Output On Exitvolt Error LOW Batt Volts Error Output 01 hrsExitvolt AUX Mode Error Output Exit Hyst Time Volt Exit Next SET Mode AUX ModeBack + OFF Night Light Off Hysteresis Time Minutes Back + Night Light On Time Hours Back +Night Light Threshold Voltage 010 Back + Press the Volt soft keyOutput Off Auto Float Output OffDiversion Relay Output Off Press the Next soft key ro view the AUX Float screenHold Delay 01.0 Time Seconds Back DLY+ AUX ModeDiversion Relay Absorb--Float--EQ Relative VoltsExit Time Volt AUX Mode Diversion Solid St Output OnExample of Diversion Press the Exit soft keyDiversion Load and AUX Wiring Set-Up Illustrated Press the Time and Volt soft keys to adjust the set points Delay Time Sec Timer Back +Low Batt Disconnect Back Exit Time Volt Disconnect VoltsRE-CONNECT Volts Remote Output Off Charger GAux Light MiscLogging Stats Exit soft key twice to return to the Main Menu Off screenEQ-Battery Equalize Exit + ModeBacklight Charger Aux GLight EQ Misc Optimize Logging StatsBattery Equalize Exit Next -EQV +EQV Battery EqualizeExit Next -HRS +HRS Battery Equalize Back Auto Start StopCount 000Exit DAY +DAY Exit Next -EQV +EQVMISC-Miscellaneous GT State PWM% ChgT 255 07 50.0Exit Next Press Next to Continue to the Force Bulk/Float ScreenPWM% ForceExit Next Float Bulk PCBSnooze Mode .6 amp AdvancedCharger Aux Light Misc GAdvanced Logging Stats Exit Advanced MenuWakeup Mode 1.5V 05m Exit Next +VOC +Min Mppt Mode Auto Track Exit Next nonGT ModeThis screen allows the user to choose one of these modes Press the Next soft key to view the Park Mpp screenPark Mpp 77 % Voc Exit Next -% +% Advanced MenuMpp Range Limit %Voc Min Max Exit Next 1/2 90% Park Mpp Watts 77 % VocAdvanced Menu Absorb Time Limits Hours Charging-Related ScreensExit Next + 00 a 12.6Vbatt Calibration 14.1 RTS Compensation 14.1Exit Next Wide Advanced Menu Exit Next Limit SET RTS CompensationMode Exit Next Mode Advanced Menu Mode Exit Next ModeRTS Compensation 14.4 V F Exit Next Limit SETReset to Defaults? Exit Next Mode Advanced MenuAux Polarity Are you sure? Reset to Defaults Yesno Advanced MenuCharger GLogging StatsLogging Clear LOG Back Totl DailyToday 0000Ah 00.0 KWH 011Vp 00.0Ap 00kWp MAX MIN FLTStats Secondary Stats screen Warranty its use in these applications Micro-Hydro and Fuel Cell ApplicationsMppt Mode Auto Track To adjust the Lower Mpp Range LimitAdvanced Menu Micro-Hydro and Fuel Cell Applications Park Mpp WattsAbbreviated Menu Map OutBack Power System GTFX/GVFX Grid-tie settings Application NotesGrid-tie applications non-OutBack inverter/chargers Positive grounded systems12V Battery System Efficiency Curve 24V Battery System Efficiency CurveUnderstanding the Various Operational Modes Page Page MATE-Displayed FLEXmax 80 Screens Status Mode Screens Aux relay state indicates if the AUX is on or OFFFLEXmax Meter Screens MATE-Displayed FLEXmax 80 Status Meter ScreensPress Setp to view Setpoint screens MATE-Displayed FLEXmax 80 Advanced Screens MATE-Displayed FLEXmax 80 Status Setpt SET Point ScreenCC Setpoint Screens FLEXmax 80 Advanced Menu FLEXmax 80 EQ Screens FLEXmax 80 AUX ScreensFLEXmax 80 Displayed Screens FLEXmax 80 Stats ScreensAbbreviated Exit Next + Advanced Menu Troubleshooting Guide FLEXmax 80 does not boot/power-up blank LCDFLEXmax 80 not producing expected power FLEXmax 80 is always SleepingFLEXmax 80 Battery Temperature Compensated Voltage FLEXmax 80 is not equalizingFLEXmax 80 Internal Fan To enable/open the FLEXmax Select Version screensFLEXmax 80 is beeping Typical Array Sizing Guide Standard vs. Australian Default Settings Wire Distance Chart 12V PV Array 16v Vmp24V PV Array 32v Vmp 36V PV Array 48v Vmp60V PV Array 80v Vmp 48V PV Array 64v Vmp72V PV Array 96v Vmp Wire and Disconnect Sizing Battery Side of the ControllerPV Side of the Controller NEC ComplianceWiring Compartment Maximum recommended battery conductor is #2** AWGRecommended Conductor and Breaker Sizes for the FLEXmax Output Rating less than 64 ampsFLEXmax 80 MULTI-STAGE Battery Charging Page Battery Temperature Compensated System Non-Battery Temperature Compensated SystemBattery temperature compensation with other slopes Suggested Battery Charger SET Points Battery Voltage and State of ChargeSpecifications Calling the Factory for AssistanceFive Year Limited Warranty Information FLEXmax ProductsRevision.2007-10-02 Limited Warranty Registration Outback Power Systems Inc 19009 62nd Ave. NEEU Declaration of Conformity OWNER’S System Information Phone +1 BARCELONA, España Phone +34.93.654.9568