Problems related to uninterruptible power supply and Power Inverter have been discussed here with possible remedies. If you have any UPS or Power Inverter related issue, this post is helpful to fix that. Someone might argue why I have made a single post for two separate products. The answer is simple. If a power inverter carries a built-in charger with reasonably low switch over time from external power source to backup batteries, it acts as a UPS. Manufacturers who sell Power Inverters and UPS’ under two different categories provide built-in batteries for UPS which are packed inside the enclosure. But no batteries are provided with Power Inverters and consumers are allowed to connect them to desired size batteries of their choice. Therefore, Power Inverters circuited with larger batteries can be used to provide backup for a longer duration during power outages or scheduled load shedding. In short, UPS and Power Inverter both can be used as uninterrupted power backup source for home and office appliances, mobile communication equipments, servers and much more.
UPS / Power Inverter is not turning on.
Possible Cause & Remedy:
1- Power switch is defective. Take it to service center for repair.
2- UPS / Inverter is tripped. Press Trip reset button on UPS / Inverter to reset it.
3- Battery is not connected. Connect the battery.
4- Battery terminals are loose. Check battery terminals.
5- Battery terminals are corroded or rusty. Clean them.
6- Battery is weak. If it is old, replace it. Otherwise, charge it.
6- Battery is discharged. Charge it for several hours before putting it to work.
7- Battery is faulty. Replace battery.
8- Battery terminals are reversed. Connect terminals correctly. Refer to user’s manual for details.
Battery is not getting charged.
Possible Cause & Remedy:
1- Battery is dead. Replace battery.
2- Rectifiers are burnt. Take UPS / Inverter to service centre for repair.
3- Fuses are melted. Replace them.
4- Battery connection is loose. Check battery terminals for corrosion. Clean them and clamp them firmly.
Backup time is shortened.
Possible Cause & Remedy:
1- Too much power consumption. Disconnect extra load.
2- Battery has worn out. Change battery.
3- Battery is not properly charged. Charge it. If charger appears to be faulty, get UPS / Inverter fixed.
4- Battery has lost electrolyte. Top up flooded lead acid battery with distilled water regularly. Sealed (dry or maintenance free) battery requires replacement.
UPS / Power Inverter works only in inverter mode.
Possible Cause & Remedy:
1- Input is not connected. Check power cable.
2- Fuse is melted. Change it.
3- Input protector is effective. Reset input protector.
4- Input is too high to be accepted. Check input voltage.
5- Input is too low to be accepted. Check input voltage.
Alarm buzzer beeps continuously.
Possible Cause & Remedy:
1- Overload. Disconnect extra load.
2- Cooling fan is stuck. Take UPS / Inverter to service center or service it yourself.
3- Battery terminals are wrongly connected. Refer to user’s manual for details.
LCD displays fault code.
Possible Cause & Remedy:
1- Internal problem. UPS / Inverter circuit needs to be repaired.
2- External problem. Check battery cables, input and output wires, load etc. Correct any fault generating error. (Read user’s manual to determine fault code and its remedy)
Hear noise coming out of UPS / Power Inverter.
Possible Cause & Remedy:
1- Wind noise. It is normal.
2- Fan is noisy. Clean fan. If problem persists, replace it or get it done by trained personnel.
3- Humming noise produced by non pure sine wave UPS or Inverter. It is normal.
LCD/LED indicates overload.
Possible Cause & Remedy:
1- Devices drawing excessive power. Remove high power consuming devices
2- Shorted circuit causing overload error. Check if phase and neutral are joined together in wiring
3- Internally damaged. Needs repairing.
Why UPS Restarts Or Shutdown Computer – Reason & Solution
How to Fix Low Backup Problem with Power Inverter or UPS
[These are general solutions and may be applicable to inverters and UPS’ brands including APC, CyberPower, Microtek, Homage, Ecostar, Exide, Luminous, Sukam, Inverex, Kevin, Numeric, Blue Gate, V-Guard, Mercury, Amaron, Xantrex, Whistler, Wagan, Victron, Tripple lite, Thor, Spartan Power, SMA America, Samlex, Raptor, Power Bright, Morningstar, Magnum, Kisae, Go Power, Energizer, Cotek, Cnbou, Aims, ABB, Ablerex, Active Power, Aetes, Alpha, Alwayson, Amplimag, Benning, Chloride, Clary, Cyberex, Gustav Klein, Gutor, IE Power, Irem, Jovy Atlas, Piller, Minuteman, Powercom, Power Kinetic, Salicru, Sanken, Socomec, Solidstate, Tripp Lite, Toshiba, Mitsubishi, Fuji, Falcon]
I purchased sf sonic invertor Prima 700 sine wave but ups giving humming sound,plz help me resolve this problem.
Modified sine wave UPS will always give this humming noise. You need to live with it.
Dear Sir,Why the cooling fan is not moving any time in my 12V Microtek EB900 inverter
Is it not running when inverter supplies backup? It could be stuck.
KORSA TIRUPATHI RAO
Sir I am using sukam falcon plus 900va invertor, luminous tubular 150ah battery, main power supply input failed invertor deep sound and over load indication showing, invertor out put power supply is not coming. invertor button also in on position. What’s the problem?
Hi I have online Db UPS . Its 2200 MFD 450VDC capacitor was burnt out i replaced same . But now its showing issue in input section after input its not giving output neither on mains ON condition nor in Inverter mode condition .
There could be another damaged component as well.
Our indus 3.5 kva inverter has tripped with short cricuit. so how can we solve it?
Deepak ku sahoo
Microtec EB 700 inverter.. Battery is charging but whenever the output is connected the inverter flickers with sound (like hiccups) continuously. The cfl and other equipment also flickers.
The rate is about once per second.
Sir, my 5 KVA online UPS switches on on battery but does not switch on on mains
Check the mains circuit, fuses and voltage. Take help from trained personnel if you are unable to figure out the problem yourself. There may be a problem within UPS as well.
Hi sir actually my inverter fan is not running, its luminous zelio 1100 sine wave 900 VA, can you help me?
My UPS is indicating FLA and SnF warnings. What would be the problem?
Model is luminous zelio 1100. Please reply.
I have a Bajaj IVX800 HomeUPS (inverter), about 3 yrs old. The back up started falling and one day it just kept beeping and shut down. I topped up the battery . Started the UPS but there is no display light; the out put is still available but no back up. what could be the possible reason?
If this detail is of any use – there is just the phase going to the UPS, and output is also a single wire going to the output plug.
May be the battery is dead.
I have Intex 725 UPS it works normally but when electricity fluctuate it give continues beep and then monitor get no signal and electricity main board light blink but when i disconnect ups input all blinking and beep sound stops
That resets the UPS.
May be install a voltage protector in mains DB to cut off supplying electricity temporarily when such fluctuation happens.
in my sukam 850va shiny ups .the fuse for 220 v has blown . and when i put new one it has blown again . what to do ?
Abdul Salam Mir
We have exide ups 850va .Its display is showing fuse trip, but all fuses are ok still it continuously beeps and neither direct AC output it gives nor inverter AC supply it gives.
I have also the same problem
sir i have apc 3000kva ups ,when switch on ups displayed internal fault ,
so removed the cover of ups found capasitor c770 ac out put capacitor 206k/400v damaged what can I do please reply
change the burnt capacitors with same spec capacitors
I have a sukam shiny 900va inverter.The problem is that when the main goes out then in normal way run to backup mode. But when the main come back then it does not work to main mode
Check the input voltage. It might be low when power restores so inverter keeps running in backup mode.
input voltage is 235-245 volt
If it’s still not shifting to main then you should get it checked from service center.
we have have 6 KV online ups with 16 numbers of 65 AH batteries,
since few days onwards, if power gone ups backup 10 to 15 seconds only,
we tested on through meter in power on mode power show 200+
if we power off its show 200…170 then suddenly ups backup off.
plz suggest me sir
How old are the batteries?
My inverter sukam 850 VA is not able to give power to fans. Initially it was giving power to 4 lights and 3 fans but after some repair it is giving power only to 2-3 lights. any issue with relay. The technician says there is no issue with inverter.
Did you check the wiring? Connect a pedestal fan directly to inverter and check if that works.
Hi Sir…My Sukam Shark 850 VA inverter is not working properly when connected to power..it gives very low voltage. It’s fine when there is no power..where might be the problem…?
my ups is not switching to battery mode when there is a power failure.I have checked the battery and fuse. both of them are fine. I don’t see any burnt out part in the circuit either. when i turn it on it gives a tick sound and i can turn the computer on but when main supply goes off suddenly everything turns off. what could be the reason
Clean your UPS properly with air blower. Clean battery contacts too. Make sure there is no corrosion on terminals.
I have sukam flacon plus 1100 va inverter whic autocuts in low and high voltage and switch on backup mode automatically…the problem is that initially in high voltage condition it autocuts with a vibrating sound as one day there is high voltage fluctuations for 10 minutes my inverter autocuts normally but after then it only makes vibrating sound in high voltage fluctuations and doesn’t autocut off now.
Plz tell me what is the problem now why it is producing vibrating noise in this condition or it reqires more voltage to cutoff
It should. If it doesn’t then there might be some problem within it. Better check it thoroughly.
My zelio 1100 inverter is stuck on 5 min charge remaining
What is the solution
I too have the same problem. Any solution?
Dear sir ,
In my online ups there is problem that is this appearing battery blow even it is running online.But to clear my doubt I checked all the battery that is ok
For the last 2 days my Luminos inverter is behaving very strange. When light goes off it shows UPS On but none of the home appliances gets power for 10-15 minutes. I checked every fuse & battery water level is also high. After 10-15 minutes if current is still not there then it starts supplying power to home appliances. But if light comes in and goes back again then again it takes 10-15 minutes to supply power. What could be the reason ?
Show it to technician. May be relay issue or something.
my luminous ups starts supplying battery current while power is there. it remains in the same condition for 15 to 20 min then automatically gets fixed
check input voltage
Sir l have exide inverter 1450 va. Its display showing fuse trip word. i checked fuse. its ok. one service man telling board problem and need to change. Is this correct. Sir??
My invertor is showing battery low and no overload and the indicator of mains on and getting charged but it is not working as my freezer is connected to invertor also , please reply me
I am using sukam inverter falcon 1000VA. It is working fine from 9 – months. Suddenly it gives an alarm mains on with beep sound. I checked fuse and water levels, both are fine. Can you please suggest me what might be the issue.
My inverter keep beeping during the Main Power on, So i have to Switch off the Two-Way Switch to this Continueous Beep, I do maintain the Distilled water level on the Battery. During Power Off, I have to turn on the Two-Way Switch to get my Home Connected with Inverter power Supply. Guide on what could be Cause of the issue from the Inverter Side, have Checked the Fuse… Seems to be fine.
Su-Kam Fusion 3.5KVA inverter issue
> Just with o/p connected works normally with all the loads.
(Battery volt: 50V, All the batteries are in healthy state and connected properly)
> But when I connect the mains it’s giving error saying “Main MCB Trip”, please reset the switch.
however I don’t see main MCB trip, I’ve reset the switch still the issue exists.
I’ve tried couple of times reset the issue still exists.
Can you please me with solution.
Manoj Kumar Singh
Sir, my Exide Tubular battery Model IT 500 for home use is posing trouble.My Microtec UPS Sine Wave inverter indicates full charge but can not take load of even two fans for 10 minutes. Engineer of battery company is accusing Microtec while representative of Microtec is blaming battery. How can I ascertain the exact problem?
How old are you batteries?
my exide inverter 850 inverter display is showing trip and short circuit how to solve this problem
Dear sir, I am using 650 v inverter. I have turned on TV on inverter supply. Suddenly inverter switched off. After switch on it is showing battery low along with all indicator s making notice please guide me to solve the problem
It seems like you connected CRT TV. These TVs have high starting current and could cause overload.
Dear sir, in my inverter continuous beep sound is coming and while power on the button, it suddenly turns off
Sir, are inverter ups indicator works on main supply without connected to battery or not.
They may light up in some inverters.
Su – kam 600VA shows inverter on LED but power doesn’t come out
check the wiring. may be it is not getting neutral or phase wire is not getting current.
Please my1.2kva Mercury inverter is displaying F2 code please what does this implies
Sir, recently we moved to a newly built house. But since then many Led bulbs are getting fused one by one. Incidentally no bulb without inverter connection is damaged! Electricians can not find the problem. Is it a defect of the inverter or inverter wiring? Both the inverter and battery are about six years old.
Modified/simulated sine wave or square wave inverters can burn your LED bulbs. Mostly, if one LED burns in a series circuit inside LED bulb, the whole pack of LEDs will stop glowing.
Our load is 50w means only 4% load connected and power factor is .9
Our load is LED Bulbs
Run this ups by isolating it from wiring and connecting some load directly to its output. If it behaves the same way you should claim the warranty.
Sir , iam righting a proposal to power university on solar inverter , after taking my statistics of the load that is the appliances. I get 114,915 KW . now my questions is how many panel, inverter and batteries that can power the university.
Depends what kind of solar panels you use. You will find smaller panels that can produce more power and vice versa. Panel manufacturers can guide you better.
You need inverters that could supply more than 114,915KW power. Check with the manufacturers.
Batteries size and number will depend on how many hours of backup is required and what kind of batteries you are willing to use with the system.
I have an inverter connected to 100 Ah battery .Unintentionally i plugged my PCE-UPS power cord to the inverter outlet , which i already have turned off , so as i immediately heard a sound from UPS like tik tik tik …. i disconnected my PCE – UPS power cord of the inverter outlet .
did that cause any intire trip to my UPS?
Thank u for your patience
Im sorry for mistake :
” ….. inverter , which i have already turned on “
Is it not working now?
Hello sir, we install microtech solar ups with battery backup, when we ON the ups it’s gives ac supply to our load but after some period it gives o/p short circuit on its diplay ,when we restart the ups it work as normally . So what I do to solve this problem…?
How much load are you putting on it and what’s the power factor of this ups?
Edema ups show short circuit
I have sukam shiny 850va inverter
The problem is when the mains is turned on the inverter will start indicating overload without any load please suggest me some idea
Remove any wires or plug connected to output and check again. If problem persists get it fixed. Otherwise, your wiring has some problem like may be reversed polarity when main are restored.
in one online ups, output sometimes goes beyond acceptable range. what is the fault
how much high does it go?
My 7.5kVA 120V sine wave inverter, tripped immediately after loss of power for low battery.But checked the battery terminal with a voltmeter and it gives 131V that indicate the batteries are charged.Few days later, it lasted 13minutes.Two weeks later 4hrs; as against the 40hrs before this fault was noticed.Kindly advise on possible solution.Thank you
Which brand inverter is this? Did you contact the manufacturer to inquire about it?
Luminous Inverter. I am yet to contact the manufacturer. It seems to be okay now but the performance is unpredictable.
My luminous 1500va sinewave inverter displays TH error and goes off, comes on and goes off continuously . I have searched user manual didn’t see any TH Code
Did it start doing this after a thunderstorm?
TH error code may refer to surge caused by thunderstorm or bad grid transformer causing abnormal voltage spikes that can damage your inverter.
panda 610 ups low battery showing after mains on. charging ok but when mains are off inverter continuously showing low battery.
My UPS has AVR to regulate 240V back to around 220V (it’s been working for 2months without any problems) and it just stopped doing that. When I turn on the monitoring software it doesn’t inform me anything is wrong. But it does show that the computer’s power supply is getting all 240V into it instead of regulated 220V, tho it doesn’t show anything is wrong. Sometimes, completely on it’s own, it turns on and starts regulating voltage. Does this mean AVR thing is broken? Should i just contact tech support?
Thank you in advance!
240V is not very high voltage. 220V-240V is widely acceptable range. You should only worry if voltage is way too high for example 250+ and then if AVR fails to step that down you got the problem. Still you may contact tech support if you haven’t already and confirm about that.
Thank you for advice.
Radiant Mix Plus UPS. When electricity gone backup mode starts 10-15 seconds late. Battery is replaced 2 months ago and charging appropriately. Plz help me with causes and remedies.
You need to show it to some technician. In the mean time check that backup button is not malfunctioning.
I have certon home ups . When i m connecting battery its sparking and showing 6 amp and not giving output. Plz suggest me.
Usually minor spark while connecting ups with battery is normal. Make sure you are connecting battery correctly. You need to press backup button on ups.
I had purchased Mtek Power long life Tubular battery from Sunrise Enterprises
on 08 August 2016 with invoice bill no. 95 with warranty of 36 months. It has a 18 months replacement warranty.
I raised a complaint as the battery backup was very less . A technician visited and after fully charging the battery could give a backup of less than 10 minutes having a load of only 100 watt bulb.
The technician said he will report same to the company.
After that I received a call from company and they said the battery will not be changed as the date of manufacture is old.
The battery details are:
Battery: M Tek
Tall Tubular battery
Bill invoice No.95
Date of purchase: 8 August 2016
Warranty 36 month
Serial number: GSRC053302037603
What is causing my inverter light to blink when its on
Is your inverter working fine?
i have a 3.5kW Sukam inverter for home use; it suddenly stopped switching on after a lightning struck in our neighborhood. Electrician admits that our house is yet to have earth wire connections. What potential damage could it have sustained or its an inbuilt protective mechanism on display?
Lightning strike is dangerous for unprotected electronic appliances. Earthing circuit can not help if surge comes in phase. You should install surge protector to protect your devices.
In my inverter , the fuse is broken and half of it stuck in it, how to take it out?
Tilt inverter and shake to let it out.
Or use a screw. Screw it into the broken fuse and pull it out.