Go Back   Team-BHP > Around the Corner > Shifting gears > Gadgets, Computers & Software


Reply
 
Thread Tools Search this Thread
Old 13th November 2016, 01:01   #946
Distinguished - BHPian
 
Thad E Ginathom's Avatar
 
Join Date: Jun 2007
Location: Chennai
Posts: 7,735
Thanked: 6,952 Times
Default Re: Inverter Batteries

Quote:
Su-kam Solar UPS 1 KVA Rs.18,500.00

SU-KAM Solar panel 4*250 Rs.64,000.00

SU-KAM Tall tubular Battery 150ah 1 Rs.14,500.00

Panel angle Rs.10,000.00

Installation extra.
e&oe in my copying!

Except I think there should be two batteries, which would increase the total from 1,07,000 to 1,21,500
Thad E Ginathom is offline   Reply With Quote
Old 13th November 2016, 05:26   #947
BHPian
 
deep_bang's Avatar
 
Join Date: Mar 2007
Location: Bangalore / Boise
Posts: 579
Thanked: 278 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by Holyghost View Post
My 3kw SuKam grid tie setup costed a little over 2Lakhs. 1L+ for a 1kva battery based system seems too high. Please check the cost of having a 1kw grid tie + a normal inverter.
How is it working out till now? I was considering this for almost 2 years but worried about the bureaucratic processes I may have to go through with BESCOM to get paid for the electricity given back. A friend I know has this and not yet got paid by BESCOM even after a few months of this system beig installed. Hence the question.
deep_bang is offline   Reply With Quote
Old 13th November 2016, 16:30   #948
Senior - BHPian
 
hserus's Avatar
 
Join Date: Sep 2014
Location: Chennai
Posts: 1,811
Thanked: 1,798 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by deep_bang View Post
How is it working out till now? I was considering this for almost 2 years but worried about the bureaucratic processes I may have to go through with BESCOM to get paid for the electricity given back. A friend I know has this and not yet got paid by BESCOM even after a few months of this system beig installed. Hence the question.
For most if not all intents and purposes a regular inverter that runs off batteries is just what the doctor ordered.

There is a govt subsidy on solar panels but ridiculously difficult to claim back, much the same trouble as trying to get credit for electricity that you feed back into the grid.
hserus is offline   Reply With Quote
Old 16th November 2016, 15:38   #949
Distinguished - BHPian
 
Thad E Ginathom's Avatar
 
Join Date: Jun 2007
Location: Chennai
Posts: 7,735
Thanked: 6,952 Times
Default Re: Inverter Batteries

Thinking about the above mentioned 1kva system with 1k panels, I don't think it is a good buy for me.

The Sukam Brainy system, with 500w panels still adds up to 60K. It would keep my computer and more than enough lights/fans going. The higher price system would add a small fridge, but not an AC unit. So it is no-man's land. The real next step for me would have to be something like 5kva to power an AC machine, and the cost increment is obvious and impossible.

Advantages of the 1-lakh-plus system would probably be that, on 10%-power days, 10% of 1Kw would a usable hundred watts, instead of 10% of 500W being a one-light-bulb 5W. If it works like that.

I also suspect that the PCU/inverter is much more industrial-build (at twice the price) than the Brainy, which adds solar at not much more than the cost of an ordinary domestic inverter. Clarification is that it is a PWM model, the MPPT model being a whole 5K more expensive.

I would end up with a solar inverter, two 150amp-hour batterries (keeping my existing fairly young tall tubular) (in 12v-parallel for the brainy) and two 250w pv panels for 60K plus installation.

I think the panels are the same, so upgrade is perfectly possible.
Thad E Ginathom is offline   Reply With Quote
Old 16th November 2016, 17:44   #950
BHPian
 
Join Date: Oct 2007
Location: Bangalore
Posts: 295
Thanked: 151 Times
Default

Quote:
Originally Posted by deep_bang View Post
How is it working out till now? I was considering this for almost 2 years but worried about the bureaucratic processes I may have to go through with BESCOM to get paid for the electricity given back. A friend I know has this and not yet got paid by BESCOM even after a few months of this system beig installed. Hence the question.
My system is installed in Trivandrum, Kerala. It took 7 months to get all the approvals to connect the system to the grid. In Kerala, the payment is settled once in a year. I think it is every September. I dont expect any payment from the Govt and I am not ready to run pillar to post for their payments. My target is to offset my consumption.

I am also looking at the new 4 door Mahindra e2o in which case I might add another 2-3kw panels in future. The grid tie systems are easily scalable and you can add more grid-tie inverters in series to expand your capacity in future.
Holyghost is offline   Reply With Quote
Old 17th November 2016, 15:51   #951
BHPian
 
Prowler's Avatar
 
Join Date: Jul 2008
Location: Madras
Posts: 481
Thanked: 272 Times
Default Re: Inverter Batteries

I have an odd problem with our Online 3 KVA UPS. It originally had 4 x 85 AH batteries and we kept replacing them as they aged. We used normal CRT monitors when we bought the UPS ages ago. Now we have LED monitors and the computers came down in numbers.
When the last batch of 85 AH batteries were in service we used to have 8 hours of backup with our server + peripherals. I replaced the set with 35 AH batteries to keep the costs low. My logic was we would have a backup time of at least 3 hours under the same condition.
But we now have only about 30 -45 minutes of backup time. The batteries are new and there is no other malfunction in the UPS. Why did the backup time fall so drastically ?
Digging with the VOM, i found that from a fully charged condition of 54.4 V it drops rapidly to 46 V when it starts beeping and within a short time it comes down to 45 whereupon the UPS trips.
What do I miss ? I would be grateful for any pointers.
Prowler is online now   Reply With Quote
Old 17th November 2016, 17:47   #952
Senior - BHPian
 
Join Date: Aug 2010
Location: Delhi
Posts: 2,110
Thanked: 984 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by Prowler View Post
I have an odd problem with our Online 3 KVA UPS. It originally had 4 x 85 AH batteries and we kept replacing them as they aged. We used normal CRT monitors when we bought the UPS ages ago. Now we have LED monitors and the computers came down in numbers.
When the last batch of 85 AH batteries were in service we used to have 8 hours of backup with our server + peripherals. I replaced the set with 35 AH batteries to keep the costs low. My logic was we would have a backup time of at least 3 hours under the same condition.
But we now have only about 30 -45 minutes of backup time. The batteries are new and there is no other malfunction in the UPS. Why did the backup time fall so drastically ?
Digging with the VOM, i found that from a fully charged condition of 54.4 V it drops rapidly to 46 V when it starts beeping and within a short time it comes down to 45 whereupon the UPS trips.
What do I miss ? I would be grateful for any pointers.
The AH ratings are for 10 hour discharge, so with 85AH batteries you should get 8.5A for 10 hours. The catch is that as the discharge increases the capacity rating decreases. The exact figures are available in some battery sites, but as far as I can recollect doubling the discharge rate reduces the backup time by four times (not two times).

Another factor is the charging current. For 85AH a higher current is used compared to 35AH. That would have a major impact on capacity, unless the charging circuit takes lower capacity into account.

In your case I would recommend that you estimate the current load and them change your UPS to match the load.

Here are a few links that would help you
http://pvcdrom.pveducation.org/BATTERY/charlead.htm
http://www.power-sonic.com/images/po...hManual-Lo.pdf
http://homepages.which.net/~paul.hil...eriesBody.html
Aroy is offline   Reply With Quote
Old 18th November 2016, 15:58   #953
BHPian
 
Prowler's Avatar
 
Join Date: Jul 2008
Location: Madras
Posts: 481
Thanked: 272 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by Aroy View Post
The AH ratings are for 10 hour discharge, so with 85AH batteries you should get 8.5A for 10 hours. The catch is that as the discharge increases the capacity rating decreases. The exact figures are available in some battery sites, but as far as I can recollect doubling the discharge rate reduces the backup time by four times (not two times).
Thank you so much Aroy Sir. So in my case the battery capacity has come down drastically as the UPS draws about 8 A under the normal load which is way above its C rate of 3.5 A

Would it be a good idea if I buy another set of 35 AH batteries (same Amaron and same type) and connect them in parallel ? That way I would have 70 AH capacity in theory. Problem would be as the current set of batteries age, they would skew the charging current.
Prowler is online now   Reply With Quote
Old 18th November 2016, 18:15   #954
Senior - BHPian
 
Join Date: Aug 2010
Location: Delhi
Posts: 2,110
Thanked: 984 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by Prowler View Post
Thank you so much Aroy Sir. So in my case the battery capacity has come down drastically as the UPS draws about 8 A under the normal load which is way above its C rate of 3.5 A

Would it be a good idea if I buy another set of 35 AH batteries (same Amaron and same type) and connect them in parallel ? That way I would have 70 AH capacity in theory. Problem would be as the current set of batteries age, they would skew the charging current.
That would help. I would not parallel old and new batteries, rather pair off the old batteries and new batteries (if you have even numbers). Just read up about how to prevent overcharging in one battery when two or more are connected in parallel.
Aroy is offline   Reply With Quote
Old 19th November 2016, 14:02   #955
BHPian
 
Prowler's Avatar
 
Join Date: Jul 2008
Location: Madras
Posts: 481
Thanked: 272 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by Aroy View Post
That would help. I would not parallel old and new batteries, rather pair off the old batteries and new batteries (if you have even numbers).
Thanks again Aroy Sir. I will report back after I hook them up. Hope it increases the backup time to 'normal' level.
Prowler is online now   Reply With Quote
Old 20th November 2016, 11:19   #956
Senior - BHPian
 
Join Date: Aug 2010
Location: Delhi
Posts: 2,110
Thanked: 984 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by Prowler View Post
Thanks again Aroy Sir. I will report back after I hook them up. Hope it increases the backup time to 'normal' level.
If you can get hold of a DC Ammeter, then use it to check the current consumed while the UPS is on. That will give you a clue to whether it is the batteries or an aging UPS that is the culprit.
Aroy is offline   Reply With Quote
Old 26th November 2016, 10:27   #957
BHPian
 
diyguy's Avatar
 
Join Date: Jun 2009
Location: Chennai
Posts: 250
Thanked: 111 Times
Default

Quote:
Originally Posted by Thad E Ginathom View Post
Thinking about the above mentioned 1kva system with 1k panel.
saw this ad in the paper today at your favorite weekend hangout
Name:  ImageUploadedByTeamBHP1480136231.552307.jpg
Views: 738
Size:  453.1 KB
diyguy is offline   Reply With Quote
Old 27th November 2016, 00:06   #958
Distinguished - BHPian
 
Thad E Ginathom's Avatar
 
Join Date: Jun 2007
Location: Chennai
Posts: 7,735
Thanked: 6,952 Times
Default Re: Inverter Batteries

Quote:
Originally Posted by diyguy View Post
saw this ad in the paper today at your favorite weekend hangout
Oh, thank you! I didn't know about this one at all.

Tomorrow... If I can...
Thad E Ginathom is offline   Reply With Quote
Old 5th February 2017, 23:54   #959
BHPian
 
diyguy's Avatar
 
Join Date: Jun 2009
Location: Chennai
Posts: 250
Thanked: 111 Times
Default

I may have an issue with my amaron battery. I had filled it about 5 months back but the water does not seem to reduce in it at all. On the other hand I have an exide which needed a refill last week. Both are tall tubular and the amaron is newer. I switched my inverters with the batteries and notice that the inverter connected to the amaron is always in charge mode and seems to be running hot always. The other inverter connected to the exide is never hot except probably when it is providing backup during a power cut. Could this indicate that the amaron has an issue? It does work during a power cut but just wondering if the continuous charge indication is due to a battery failure or cell failure within.
diyguy is offline   Reply With Quote
Old 21st April 2017, 15:15   #960
Senior - BHPian
 
bluevolt's Avatar
 
Join Date: Jan 2011
Location: New Delhi
Posts: 2,950
Thanked: 2,188 Times
Default Re: Inverter Batteries

Can tractor batteries be used in invertors? (90 ah/600VA)
bluevolt is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Inverter or generator? mrhap Gadgets, Computers & Software 728 12th August 2017 02:46
Car Battery to 220V AC convertor / inverter for charging laptop etc sreeku In-Car Entertainment 163 25th September 2016 23:00
Myth: UPS can't run on inverter? linuxtechie Gadgets, Computers & Software 17 24th October 2008 15:47


All times are GMT +5.5. The time now is 10:03.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks