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E2620 Auxilliary Power Unit User Guide

Detailed Description

The Auxilliary Power Unit or APU is housed in a rectangular 
modular aluminum enclosure which is black anodized for 

protection against corrosion, and to help with heat dissipation.  
This unit includes a battery cable, a 40A battery guard, a 600W 

inverter, a 25A battery charger, a fan controller, and a connector 
to the battery monitor.  

Power Input

Battery power at a nominal 12V enters the unit via the battery 
cable to a terminal block, which is a common connection point for

the other system components.  

Battery Guard

The battery guard is a protective switch between the battery and 

the inverter which is normally on when the input battery voltage 
is above a programmed threshold.  Once the battery voltage 

drops below this threshold, the switch is turned off so the inverter
load does not discharge the battery any further in order to protect

the battery against excessive discharge which would adversely 
affect its lifetime.  The battery guard is limited to a 40A load 

which represents a ~400W maximum load at the inverter output.  
Loads greater than 400W will cause the battery guard to 

shutdown until the overload is removed.  The battery guard is 
enabled on or off by the battery monitor.

Inverter

The inverter converts the 12VDC battery power to a 120VAC pure 
sine wave output through two standard 120VAC outlets.  A USB 

port is also available to power or recharge 5V USB devices.  The 
output power rating is up to 600W continuous although the 

5

This device is not authorized for use with any product where the failure or malfunction of 
this device can reasonably be expected to cause injury or death.  This device is not 
authorized for use in any life support system due to the risk of injury or death.

Summary of Contents for E2620

Page 1: ...Locus Engineering Inc E2620 Auxilliary Power Unit APU Battery Monitor User Guide August 07 2018 ...

Page 2: ...derstand this guide before using the unit It contains important safety information as well as operating and maintenance advice 2 This device is not authorized for use with any product where the failure or malfunction of this device can reasonably be expected to cause injury or death This device is not authorized for use in any life support system due to the risk of injury or death ...

Page 3: ...rload undervoltage and overvoltage protected easy to use single rotary switch controls Off Standby Run battery monitor displays internal temperature battery voltage battery guard voltage graceful low voltage warning with bargraph display voltmeter and flashing light allows time to return customizable product and installation includes both inverter and charger connected to battery for convenient op...

Page 4: ...0Ah to 500Ah Charger Input Current 6A max 120VAC Charger Output Current 25A max 12V to 15 7V Charge Time approx 4 hrs Fan Turn On Temp 27C Fan Turn Off Temp 25C Fan Controller dual analog and digital control Temp Sensor 1C Volt Sensor 0 1V Inverter Charger Size 16 L x 14 75W x 4 5H 40 6cm x 37 5cm x 11 4cm Battery Monitor Size 4 4 L x 2 4 W x 2 0 H 11 2cm x 6 1cm x 5 1cm Weight not incl batteries ...

Page 5: ...is threshold the switch is turned off so the inverter load does not discharge the battery any further in order to protect the battery against excessive discharge which would adversely affect its lifetime The battery guard is limited to a 40A load which represents a 400W maximum load at the inverter output Loads greater than 400W will cause the battery guard to shutdown until the overload is remove...

Page 6: ...t recharge the battery while the inverter is running For loads of 250W and greater the inverter input current will be greater than the battery charger current so the battery will never recharge For lighter loads there is a possibility the battery guard may shutdown due to overvoltage on the battery during the final charge phase Cooling The inverter battery guard and battery charger produce heat du...

Page 7: ... graceful low voltage warning which flashes faster as the battery voltage drops beyond 20 capacity Its purpose is to alert the operator that the battery will soon be depleted and that the connected equipment will also soon be shut off The rate of battery depletion and the remaining time to seek a battery recharge and equipment reconnection to an alternate 120VAC outlet will depend on the equipment...

Page 8: ...losed to prevent any rain or snow from entering the unit The equipment power cables can be restrained with VELCRO hook and loop fastener straps The battery monitor should be located where the operator can see the display and warning LEDs as well as operate the power switch The battery monitor cable is connected to the unit within the access door It is a keyed twist and turn connector Battery The b...

Page 9: ...o On and verify that the battery guard voltage closely matches the battery voltage and that the equipment is on and functioning Ensure that the inverter switch behind the access door is on and the attached equipment is on 9 This device is not authorized for use with any product where the failure or malfunction of this device can reasonably be expected to cause injury or death This device is not au...

Page 10: ...at your local battery recycler Ensure that the total attached electrical load is within the limits of the inverter Ensure the access door is closed to protect against rain or snow To ensure the quickest battery recharge it is recommended to not charge the battery while the inverter is running 10 This device is not authorized for use with any product where the failure or malfunction of this device ...

Page 11: ...e is present when switch is on remove and check fuse for continuity using a multimeter set to ohms recharge battery if voltage bargraph display is off open the access door and check that inverter switch is on Overheating and Shutdown return equipment indoors allow unit to cool down before re charging battery Short Battery Life have battery checked and replace battery if necessary 11 This device is...

Page 12: ...one year period It is understood that this unit is a prototype unit that may require modifications or improvements to meet customer requirements This unit will be repaired or modified within the warranty period subject to the following conditions the warranty will not apply to normal wear or consumable items such as batteries the warranty will not apply to reverse battery installation the warranty...

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