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Modify my UPS to power my Laptop Adapter
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Woowei
Rated PG


Joined: 20 Dec 2017
Posts: 1

PostPosted: Thu, 21 Dec 2017 05:32:01    Post Subject: Modify my UPS to power my Laptop Adapter Reply with quote View Single Post

I have 700VA UPS which I had bought in 2009 to power my Desktop Computer.It can power desktop(17" CRT monitor,CPU cabinet ) for 5-6 minutes.It has 7Ah battery(only 1), charging and inverting circuit and a transformer() inside. Now I want to modify it to power my Laptop Adapter whose specifications are:

Code:
100-240V~1.8A 50-60Hz
20V-3.25A
65W


The problem is, it only last for 15 minutes. Since the load is only 65 watt, I had expected hours instead of minutes.

So, what should I do to make it last for hours??

I searched for this on google and went through several sites and found some things regarding UPS:

Code:
UPS transformer is designed to power high power device(generally 400-500Watt) for short time(5-6minutes). At longer use , it may burn.


So, if I change the transformer inside with lower capacity trasformer( 100Watt), will I get backup for long time(1-2hours). Also, I have cooling fan from desktop CPU cabinet which I can use to cool the tranformer.

Please suggest me ways to modify it.( If you are wondering why I need UPS for Laptop, here in Nepal we have Load Shedding for 11 hours each day and Laptop battery last only for 2.30-3hrs and if I am able to modify a UPS(lying around) for 1-2hrs, it would be great!!)
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Little Bruin
Boo Boo

Joined: 07 Apr 2003
Posts: 667
Location: Pic-A-Nic Basket
Ice Bank
Mice Elf


Joined: 11 May 2013
Posts: 1357
Location: USA

PostPosted: Thu, 21 Dec 2017 19:43:21    Post Subject: Reply with quote View Single Post

Is this supposed to be portable? Seems like a cumbersome option. Why not just plug the laptop adaptor in to the UPS?
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