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Old 19th July 2019, 21:59   #1381
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Default Re: Inverter Batteries

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?

Last edited by Aditya_Bhp : 19th July 2019 at 22:03.
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Old 20th July 2019, 10:20   #1382
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Default Re: Inverter Batteries

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Originally Posted by Aditya_Bhp View Post
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.
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Old 21st July 2019, 11:34   #1383
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Default Re: Inverter Batteries

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Hey Wasava,

Thanks for the info.
I tried, unsuccessfully to source Amaron batteries here in Goa.
Not in stock was the general reply.

Regards,
SS
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
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Old 21st July 2019, 15:39   #1384
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Default Re: Inverter Batteries

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!
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Old 22nd July 2019, 10:00   #1385
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Default Re: Inverter Batteries

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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.

Last edited by Prowler : 22nd July 2019 at 10:02.
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Old 22nd July 2019, 14:29   #1386
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Default Re: Inverter Batteries

Thanks! If memory is correct, you are right: the fan only makes this noise on lower speeds --- but I will check.
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Old 27th July 2019, 06:36   #1387
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Default Re: Inverter Batteries

The Charging Indicator is Blinking Continuously for past few days. Is it faulty inverter or battery? The battery is warmer to touch on sides.
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Old 27th July 2019, 12:11   #1388
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Default Re: Inverter Batteries

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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.
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Old 27th July 2019, 15:44   #1389
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Default Re: Inverter Batteries

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Thanks! If memory is correct, you are right: the fan only makes this noise on lower speeds --- but I will check.
Very curious about the final diagnosis on the fan/inverter, any update Thad?
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Old 27th July 2019, 16:20   #1390
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Default Re: Inverter Batteries

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.
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