Xantrex Technology Freedom SW 2000 Battery Information, Battery Bank Sizing, Compute Amp-hours

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Battery Information

Battery Bank Sizing

Estimating Battery Requirements

Battery capacity Battery size or capacity is just as important as the battery type selected for use with the Freedom SW 2000. The batteries are the most important part of your system, so Xantrex recommends that you purchase as much battery capacity as possible. A large battery will extend running time and ensure that your inverter/charger delivers full rated surge.

Xantrex recommends a minimum battery size of 200 amp-hours (Ah) for moderate loads (<1000W) and greater than 400 Ah for heavy loads.

See “Estimating Battery Requirements” for information on a more detailed calculation.

About Amp-hoursA number of different standards are used to rate battery energy storage capacity. Automotive and marine starting batteries are normally rated in cranking amps. This is not a relevant rating for continuous loads like an inverter. Deep-cycle batteries use a more suitable rating system such as amp-hours (Ah).

Amp-hour capacity is the number of amps a battery can continuously deliver during a specified number of hours. It is represented by the product of the two —amps multiplied by hours.

A typical marine or RV battery rated for 100 Ah can deliver 5 amps for 20 hours (5A × 20 hours = 100 Ah). This same battery can deliver a higher or lower current for less or more time, limited approximately by the 100 Ah figure (50 A for 2 hours or 200 A for 1/2 hour), but usually the capacity figure given is only accurate for the specified duration (20 hours).

Calculating Battery Size

only.

 

Step 1: Compute Amp-hours

installers

For each appliance, compute the number of amp-hours that will be used

 

between charging cycles, as follows:

 

1.

Obtain the wattage. If the wattage is marked on the nameplate rating,

qualified

2.

Obtain the Watt-hours by multiplying that amount by the hours the

 

use that. Otherwise, multiply the marked voltage and amperage:

 

 

WATTS = VOLTS × AMPS.

 

 

appliance will be used:

by

 

WATT-HOURS = WATTS × HOURS.

 

use

3.

Obtain the amp-hours that the appliance requires by dividing that

 

 

amount by 10 (the factor for the Freedom SW 2000, which is a 12-voltfor

 

system):

guide

 

BATTERY AMP-HOURS USED = AC WATT-HOURS/10

 

 

For example, a 100 W light bulb that is used for 4 hours will use 400 watt-

This

hours (Wh) and the inverter will consume approximately 40 Ah from a 12

 

volt battery.

4.Enter this information on the blank calculation worksheet (page 40).

Step 2: Calculate Battery Size

5.Complete the rest of the worksheet; see Table 6, “Battery Sizing Example” on page 38 for an example.

975-0527-01-01

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Contents Freedom SW Sine Wave Inverter/Charger Page This guide for use by qualified installers only Statement of Hazard About This GuideRelated Information Electrical Shock Hazard Important Safety InstructionsExplosion Hazard Fire and Burn HazardPrecautions When Working With Batteries Precautions When Preparing to Charge Exposure to Chemicals and Gases HazardRisk of Damage to the INVERTER/CHARGER Limitations on USE RegulatoryContents Page Cabling and Hook-up Configurations Page Introduction Materials List Materials ListElectrical Shock and Fire Hazards Installation InformationBefore You Begin the Installation Installation CodesMounting Location of the Freedom SW Planning the InstallationTwo Key Performance Factors Size and Length of DC CablesSample Vehicle Electrical System Configuration AC and DC Components including wire and breaker sizesFor wire and breaker size information AC Loads AC ComponentsAC Input AC OutputTested GFCIs Distribution PanelsAC Output Protection Gfci RequirementsAC Output Neutral Bonding AC WiringDC Components BatteriesDC Disconnects and Over-Current Devices DC Grounding DC CablingHeavy Load Installation Tools and Materials ToolsMaterials Overview Installing the Inverter/ChargerChoosing a Location for the Inverter/Charger Fire and Explosion HazardHeat Hazard Close to BatteryBattery acid SafeMounting the Inverter/Charger ConsiderationsTo mount the inverter/charger Approved Mounting Orientation Orientation? Comment Approved Mounting Orientation Orientation? Connecting the AC Input and AC Output Wires General AC Wiring ConsiderationsFIRE, Electrical SHOCK, and Energy Hazards To make the AC input connections Connecting AC Input WiresEquipment Damage Damage other equipmentConnecting AC Output Wires Output AC Wire Size To prepare the DC cables Connecting the DC CablesDC Connection Precautions Preparing the CablesElectrical Shock and Fire Hazard Guidelines for Routing the DC CablesConnecting the DC Cables to the Inverter/Charger Fire HazardEquipment Damage DUE to Reverse Polarity DC Terminal Covers To connect the chassis ground 2000Mounting Options Connecting the Battery Temperature Sensor BTSTo mount the sensor on the negative battery terminal Mounting to the Negative Battery TerminalConnecting the BTS Cable to BTS Jack To mount the sensor on the battery case Mounting to the Side of the Battery CasePerforming Checks Prior to Initial Start-Up Testing in Invert Mode Testing Your InstallationInstallation Complete Testing in Charge ModeInverter/Charger Physical Specifications Calculate Battery Size Battery InformationBattery Bank Sizing Calculating Battery SizeBattery Information Battery Banks Battery Bank Sizing WorksheetRestrictions on Motor Size = Total watt-hours of AC load between charges Parallel Connection Cabling and Hook-up ConfigurationsBatteries Connected in Series Series ConnectionBatteries in Series-Parallel Connections Series-Parallel ConnectionsPage Page Xantrex Technology Inc
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