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Old 21-06-11
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How to Mod Your APC BP500in UPS to Work 4.5 Times Longer





How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

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Last edited by vijayninel; 27-06-11 at 01:28 PM.
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  #30  
By ManISinJpr ♦ 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

Arrey baba ji, I will not be charging the battery simultaneously !! only have one battery and that too the tubular one and then I can charge that if that gets drained otherwise leave it on the charging of the ups only, and having two batteries is useless as the main ups battery is gone !!
Originally Posted by baba doga View Post
it is NOT OK to have one battery being charged by two different circuits at the same time. there are so many ways in which this can go wrong. adding a relay is necessary. i suggest that you don't remove the internal battery.
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  #31  
By baba doga 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

can you kindly specify the ampere hour ratings of the outgoing primary battery and the planned large battery?

so here is what i understand about the setup you intend:
a. no internal battery. you connect a 40AH+ battery instead.
b. usual cycle: ups manages the battery charging.
c. deep cycle: you turn an auxiliary circuit on to charge the battery, parallel with the ups charging.

is this correct?
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  #32  
By npsingh123 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

Please be careful doing experiments with car batteries. If you know then there was a fire in Columbia Asia Hospital in Bangalore which started due to some careless installation of a UPS.

I removed my 7AH battery and put in a 30AH. Charging times would be around four times higher in my case. I have installed a small switch to push up the charging voltage.

BTW what are the current prices for 500watt/va inverters now?
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  #33  
By ManISinJpr ♦ 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

^^ The battery in the ups is the primary battery.. it is a 500VA ups so you do the maths
Yes I want to connect a higher ampere battery, for increase in backup times.. can be a inva tubular ( they are very coslty or a car battery )
mainly the ups will supply the charging to the battery, but if there is a prolonged use of the battery incase of a power outage, then I charge it with a different charger separately and then reconnect it again to the ups !!

But, I am living in a fools paradise, as a matter of fact, coz there is not much power outage in the place I live !!
so suggest me a battery which is better than the one in the ups, say double or quadruple and that will be the best, not much money wasted either..
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  #34  
By baba doga 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

i suppose you have 7ah. make it 2X7AH in parallel.
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  #35  
By npsingh123 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

I forgot the quoted charging times for my UPS. But this does not affect me much.

Currently I use it only to power down my PC and to run my ADSL/router. For other work, I use my laptop

---------- Post added at 10:18 AM ---------- Previous post was at 10:09 AM ----------

Try Panasonic, Global Yuasa Rocket, Exide - UPS Batteries - Way (India) Corporation . They have batteries for 12 ah and 17 ah. This is better than your battery combination method.
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  #36  
By ManISinJpr ♦ 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

^^ Yes, I just buy a 18 ah battery and connect it in place of the original one and I will be all set !!
that is superb...
Now to find out where these are available ??
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  #37  
By npsingh123 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

Solar power people have batteries in many ranges. Unfortunately I cannot recall a shop.
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  #38  
By baba doga 18-02-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

oh yes, 12ah is a good idea
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  #39  
By scudmissile007 12-09-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

can you please elaborate the voltage tweaking,I have two ups with battery dead,want to mod both so one can be used for lighting & other for comp.
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  #40  
By npsingh123 12-09-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

For that a schematic diagram of the UPS would be needed.
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  #41  
By scudmissile007 12-09-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

I have vgaurd 600royal & tpc 500 local brand I think.I will try to get the PCB diagram.
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  #42  
By prop0nik 14-09-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

This even Worked on my Numeric UPS
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  #43  
By npsingh123 14-09-12
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

Numeric model please.
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  #44  
By saruks 09-06-13
Re: How to Mod Your APC BP500in UPS to Work 4.5 Times Longer

Hi. Cant I just solder the trimpot permanently parallel to R23 resistor without the toggle switch and leave it permanently set at 14.4V?? Will it adversely affect the battery or any other component in the UPS????

Thanks in advance.
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