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How do you calculate the battery size needed for an inverter?

I am looking to purchase a 850mv inverter, is 100AH the ideal battery size? And if its a 650mv inverter?

Also doesn't Amara Raja make Xenon inverters anymore?

I have an 800 VA Inverter and chose 150AH battery for extended time. A larger capacity (to a reasonable extent) will give you longer time not only because of larger size, but because the discharge % is lower.

Hi Guys,

So I finally went in for the Microtek 2.5KVa Inverter with 4 x 180Ah Escort Batteries. I paid 56K in total. 16K for the Inverter and 10k for each Battery. Batteries have a 2 + 2 year warranty. It is fitted and working well though the Inverter fan runs continuously making an annoying humming sound. Guess I will get used to it eventually. My last inverter was silent except when it went to Inverter power and it would make a high pitched beeping sound.
Had a bit of a hiccup during installation as the "Technician" connected the batteries wrongly and blew the Inverter. Had to get a new one the next day. This is the expertise level of our "Technicians". Even though I was telling him that the connections did not look right, he would not listen and then...Poof!!

Regards,
SS

We have one fan that goes "oing oing oing" when running on inverter, and all our fans are the same model, so don't understand why.

Isn't the basic thing to look for the words "sine wave" on inverters? One of engineers here to explain please!

Almost most of the current domestic Inverters are of Sine Wave type. Like they say in 'Animal Farm' - "all are equal but some are more equal than others". Same way not all sine wave inverters put out pure sine wave. Many put out modified sine wave waveform. Modified sine wave inverters are less expensive and generally a shade more efficient than pure sine wave type.

Many sensitive electronics will object to the modified sine waves. Small induction motors will vibrate producing a hum due to the extra harmonics (50 Hz will produce harmonics at the multiples of its base frequency for example). Many such equipment will run hotter, fail often and some may not work at all.
But if your other fans are running quiet while only one appears to produce that sound, you should look at the fan regulator. Electronic fan regulators - simply put chop up the power supply to feed less power to the connected motor based on the pot meter setting.
Thus the regulators will cause humming sound in the fan if set at a lower speed. Turn the speed to the maximum where the regulator will not affect the waveform/power to see if it still causes the sound. There are other causes for odd sounds from the fan:
Dirt in the fan blade causing the motor to work harder, capacitor losing capacitance and failing bearing. Measure the temperature and compare with other fans.

Thanks! If memory is correct, you are right: the fan only makes this noise on lower speeds --- but I will check.

The Charging Indicator is Blinking Continuously for past few days. Is it faulty inverter or battery? The battery is warmer to touch on sides.

Battery being warm whilst on charge is normal. Note, it should not be hot i.e. over 50 deg C. If it gets hot, switch off the inverter and disconnect the battery. That points to a battery fault.

OTOH, if the charging indicator doesn't go off for a long time have the inverter checked by the manufacturer's service centre. The circuit may be faulty and can damage batteries if left unattended.

Very curious about the final diagnosis on the fan/inverter, any update Thad?

Sorry no. This is the bedroom fan, and only my wife likes to use fan --- and we have not many power cuts when I've been there too.

11 years back I bought a set of Exide Tubular batteries (Exide EL6+) for my UPS based on Team-BHP recommendation. They were expensive but they have lasted very well.

Now when I am considering replacing my batteries I am glad to see that Exide Inva Tubular is still the top recommendation! :)

My inverter is making a loud humming noise when I use my new laser printer. The printer is not connected to the inverter and is connected directly to the mains, but both are in the same room.
I had a HP laser printer which didn't have any issue and was directly connected to the inverter. I needed a wireless all-in-one and bought a Xerox. Since its power requirements were significantly higher, I did not connect it to the inverter and used a different power point which do not have inverter backup. But the loud humming sound from the inverter when the printer warms up is worrying me. What could be the reason?

It seems you need to have a dedicated circuit for your printer to avoid that noise.
Even my Samsung laser printer induces temporary buzzing noise to the 3kva 220-110 voltage convertor coils that it is plugged into while it is printing.


https://www.dslreports.com/forum/r29...ugged-in-to-it

Thank you. It makes perfect sense. I will try moving it to a different room. Good that I bought the wireless model, I can put it in any room.

A couple of issues with Inverter setup at my parents place.
1) The battery is not being charged, I assume this needs replacement as battery is more than 5 yrs old.
2) With the Microtek inverter unit, there is no indication of the mains On. According to the technician, for the indication to be ON the battery has to have some charge. Is this correct?

Configuration:
Inverter: Microtek 900VA
Batterry; SF Sonic PBX1500 or 150aH.
Age: 5 yrs.