Mercury Inverter 2.4kva User Manual

The Mercury Inverter 2.4kva User Manual will help you familiarise yourself with all of the features of the Mercury 2.4kva inverter and the correct installation procedure.

The Mercury Inverter 2.4kva is compact and designed to power your home appliances and precious electronics. Its compact size enables easy installation and high movability. Compared with traditional inverters in the market, this inverter provides two operation modes: UPS mode and Inverter mode. On UPS mode, the inverter can provide continuous power to general home appliances. At Inverter mode, the inverter can provide continuous power to bulb and fan loads.

The inverter has two charging modes:10A and 20A, select 10A mode when connecting to battery sizes 100AH  and lower, select 20A mode when connecting to 100AH and above.

Product Overview

Mercury 2.4kva Front-View


Important Safety Warnings

Before using the inverter, please read all instructions and cautionary
markings on the unit, the manual and batteries.

General Precaution-

Conventions used:

WARNING! Warnings identify conditions or practices that could result in personal injury;

CAUTION! Cautions identify conditions or practices that could result in damage to the unit or other equipment connected.

CAUTION! The unit is designed for indoor use. Do not expose this unit to rain or liquids of any type.

CAUTION! To reduce the risk of injury, only use qualified batteries from qualified
distributors or manufacturers. Any unqualified batteries may cause damage and injury. Do NOT use old or overdue batteries. Please check the battery type and date code before installation to avoid damage and injury.

WARNING! To connect the inverter to a fuse box engage the services of a qualified electrician, with extensive experience of connecting inverters to NEPA.

WARNING! It’s very important for system safety and efficient operation to use
appropriate external battery cables. To reduce the risk of injury, external battery cables
should be UL certified and rated for 75 C or higher. Do not use copper cables
less than lOAWG. Below is the external battery cable reference according to system


CAUTION! Do not disassemble the inverter. Contact a Mercury Service Centre
when service or repair is required.

WARNING! Provide ventilation to outdoors from the battery compartment. The battery enclosure should be designed to prevent accumulation and concentration of hydrogen gas at the top of the compartment.

CAUTION! Use insulated tools to reduce the chance of short-circuiting when installing or
working with the inverter, the batteries, or other equipment attached to this unit.
CAUTION! For battery installation and maintenance, read the battery manufacturer’s
installation and maintenance instructions prior to operating.

Personnel Precaution –

CAUTION! Careful to reduce the risk or dropping a metal tool on the batteries. It could
spark or short circuit the batteries and could cause an explosion.

CAUTION! Remove personal metal items such as rings, bracelets, necklaces, and
watches when working with batteries. Batteries can produce a short circuit current
high enough to make metal melt and could cause severe burns.

CAUTION! Avoid touching eyes while working near batteries.

CAUTION! Have plenty of fresh water and soap nearby in case battery acid contacts
skin, clothing, or eyes.

CAUTION! NEVER smoke or allow a spark or flame in the vicinity of a battery.
CAUTION! If a remote or automatic generator start system is used, disable the
automatic starting circuit or disconnect the generator to prevent an accident during servicing.


Mercury 2.4kva Spec


NOTE: Before installation, inspect the unit and be sure that nothing inside the package is damaged.

Step 1

A qualified electrician should create a NEPA only charging socket for the inverter.   The charging socket needs to be NEPA only, so the inverter does not feedback on itself.

Step 2

From the fuse box, a qualified electrician should separate the intended inverter load from the load which will be powered by NEPA and Gen only e.g AC, fridge and kitchen sockets.

Step 3

Confirm that the inverter is switched off.  Connect the inverter to an external battery bank



WARNING! Please use the appropriate battery cable. Please refer to Important
Safety Warnings Section for the details.

c: – Tight the battery cables with the M5 nuts. Do NOT place anything between the
flat part of the battery terminal and the battery cable ring terminal, or overheating
may occur. (See Fig.1)

Mercury Inverter Battery Cable Connect


Battery type selection and configuration and charging current mode selection: 4.2.1Normal configuration method:

For Inverter 1200VA, it is suggested that maximum capacity of. a battery is 12V/200Ah. With different type, detailed respectively, the  suggested configuration is as follows:

For Inverter 2400VA, it is suggested that maximum capacity of the battery is  24V/400Ah.

For different sizes, the detailed configuration is suggested as follows:


Long backup configuration method: For special requirements,

How to Mixed Connection (See Fig 3)

The maximum battery capacity that should be connected to the inverter is shown below

For Inverter 1200VA, the detailed configuration for different battery sizes is suggested as follows:

For Inverter  2400VA,with different type, respectively the detailed configuration for different battery sizes is suggested as follows:


1.2kva Battery Connection
1.2kva Battery Connection


Step 4

Plug the inverter load into one of the AC output sockets on the back of the inverter.

Step 5

Plug in the AC input cord to the NEPA only wall outlet. The unit will automatically charge the connected external battery bank even though the unit is off.

Mounting the Unit

The unit can be mounted to a wall surface.  Please follow below steps:

  1. Turn off the unit before mounting.
  2. Select an appropriate mounting location.  Use a horizontal line and the length of the line must be 205 mm and mark the two ends of the wall. (see Fig.4)
  3. Drill two marks by screws.
  4. Mount the unit by positioning the key-hole slots over the mounting screw (see Fig.5 )


    Power On/Off

    Once the inverter has been properly installed, press the power switch to turn on the unit. The unit will work automatically in line mode or inverter mode according to input utility power’s  status. When pressing the power switch again, the unit will be turned off.  The inverter LCD displays the following:

    1. Input voltage

    2. Output voltage

    3. AC mode (machine in line mode, this LCD symbol lights )

    4. Battery mode (when AC input voltage is abnormal, this LCD symbol lights)

    5. Battery level (Battery capability)

    6. Low battery (when battery voltage is low, this LCD symbol flashes)

    7. Load level (Lod percent)

    8. Overload (when there is output overloading,  this LCD symbol flashes)

    9. Fault mode (this LCD symbol will light when the inverter is in fault mode, such as output shorted, overload)

Operation  Mode Selector

a). “”UPS “”: setting for the conventional electrical appliance.

If you select this mode, the unit’s input utility range is narrow.If the utility is higher or lower than this range, the unit will transfer to battery mode automatically. And you can connect the general home appliances when you select this operation mode.

b). “”INV “”: se_tting for energy saving.

If you select this mode, the unit’s input utility range is wide.  If the utility is higher or lower than this range, the unit will transfer to inverter mode automatically.  So, you can connect lamp and fan load.

Charging Current Mode Selector

  • “”10A’: The maximum charging current is 10A, select 10A mode When Connecting Battery 100AH and Lower.
  • “”20A’: The maximum charging current is 20A, select 20A mode When Connecting Battery 100AH and Above.

Mercury Inverter Trouble Shooting

Mercury Inverter Trouble-Shooting

12 thoughts on “Mercury Inverter 2.4kva User Manual

  1. I have a 2.4kva 24v digital mercury Inverter and it brings a fault alerm in the middle of the night and on screen display fault I off it and on it back it start working but shortly phcn was restored and later when phcn was taking the inverter just tripped off.when on it on Battery Backup it on and goes off back pls what might be the cause and it has never been repaired before waiting for your reply thanks

    1. Hi Kehinde,

      Sounds like there could be an issue with your connection, ask your installer to check the electrical wiring. This issue may also be due to intermittent bad current from NEPA. If your installer is unable to detect any issues, please give us a call on 07037451701

  2. Good morning Mercury,

    I am(was) a happy user of a 2.4kva mercury inverter. I have been happy with it for a little over a year now. But lately it has been acting funny. Lasting only 5mins and i am very sure that my batteries are still good.

    I noticed though that the load level is now tilted towards the heavy side. But i havent added any new load to it.

    Pleas what do i do?

      1. Ideally it takes about 4-5 hours to fully charge the batteries.
        But now it does it in under and hour. And in under 2mins (no exaggeration) after the the power goes off, the inverter start beeping and goes off.
        I noticed though that the load level is now tilted towards the heavy side. But i havent added any new load to it.even when i remove all the load applied and observe the inverter i get the same result of heavy load indication and near instant beeping and the inverter going off

    1. Hi David,

      Switch off the inverter and all connected load. Unplug the charging plug from the wall socket. Switch the inverter back on. Does it still show F5 ? If there is no fault alarm, turn the load on one by one.

  3. Hi, I have a mercury 2.4kva inverter. Been using it for 3 months now but when I turn it on shows fault F5. I disconnected the charging plug from the socket and removed all loads but it is still the same. Kindly advise if I need to send it back to the seller and claim my warranty.

    1. Hi Jamiu,

      All Mercury Inverters come with a one year warranty. Please do contact the seller for repair or replacement under warranty.

  4. At what battery voltage is the Mercury 1.2kva Inverter suppose to beep? because I notice mine starts beeping 11.36v and then suddenly dropped to 11.0v after about 5mins and then dropped the load.

    1. Hi Donald,

      The Mercury 1.2kva is suppose to beep, when the battery or battery bank reaches a depth of discharge grater than 80% of its capacity. It is advisable to switch off the inverter whenever the alarm goes off in order to protect the connected battery or batteries from damage.

Leave a Reply

Your email address will not be published. Required fields are marked *