Inverter + Battery. Budget 10k. Possible?

raj2007

Chennai
[OP]
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Feb 27, 2009
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Just to run a Ceiling fan and a 7W LED bulb. It should give backup for minimum 5-6 hrs.
Googled and find out it crosses my budget.
Is it OK to have SMF no maintenance battery <100AH?
 

AgentX

The Secret Agent
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Dec 22, 2007
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Chennai
Possible... but for the amount of budget, it would make sense to evaluate usage pattern and go for something a bit bigger because your upgrade options would be severely limited.

But if you still want it...

Microtek inverter: 3K (shop around your local Richie street for more options since you're in Chennai)
Microtek Digital Ups Eb 700 Va Inverter: Amazon.in: Home & Kitchen

100AH battery: (7k ~ again, shop around for a better deal, go with tubular)

100AH battery contains 1.2kwh of storage (i.e 1.2 units of power).

Theoretically, it can supply a maximum of 1200 watts for an entire hour. However, real world use would severely limit this on top of converting DC to AC and you cannot use more than 80% of a lead acid battery, so let's do some maths.

100AH (only 80% capacity usage) - 20% efficiency loss / C20 discharge rating of a battery.

960 - 192 = 768 / 20 = 38.40 watts continuous operation for 20 hours.

Assuming your fan + led costs 70w, this will work a little over 7 hours depending on the quality of the battery and how it works when its being used beyond its discharge capacity.

Good luck.
 
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AgentX

The Secret Agent
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Dec 22, 2007
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Batterybhai.com ~ I see prices of 8.5k for 100AH new from Tata Green / Exite Insta etc. If you happen to have an old 100AH lying around, you can exchange it and it'll be around 6.5k. Again, shop around for more options.

I got 200AH red charge Luminous from the same site for 9.9k a few months ago so I'm sure 100AH is possible.

I would still advise to go for a bigger setup as there is literally 0 upgrade paths if you choose to do it this way.
 

AgentX

The Secret Agent
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Dec 22, 2007
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Chennai
You're wanting 5 to 6 hours MINIMUM backup for 70W continuous power delivery. SMF batteries cost more for 100AH compared with tubular. You cannot go with less capacity (i.e like 65AH) as you'll have very less backup.

Tubular also lasts long, but I guess as long as you get the capacity you'd need, I guess it depends on how long you want the battery to last? :p
 

raj2007

Chennai
[OP]
Regulars
Feb 27, 2009
2,464
125
Chennai
A local dealer quoted 9500 INR for Inverter + Battery
Microtek 400 VA + SF Sonic 65 AH lead acid battery
He told me that a single ceiling fan will run for 7-8 hrs on this combo.
I'm still looking for better battery brand and price