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I still don't get the great advantage of using DC for an ADSL modem in case OP is using a Desktop. In case of Laptop, of course, he could power it from mains. May be it is a case Of wall wart failure and he might be searching for alternatives. He could well attend to it. generally there would be a thermal fuse embedded in the winding. it can be accessed and replaced.Hero999 said:The problem with that, is that it won't last very long, as soon as the battery voltage drops below 11V it will stop regulating working properly.
shareebacha said:Well why i want this is because i m using a laptop, and power for adsl modem is coming from mains, but i live in pakistan, and i m out of electricity for about 5 to 6 hours a day. Now if i m downloading something from rapidshare and my electricity goes, the download stops and all the efforts go to vain, and i have to start downloading again.
Now the ups solution will work, but it will be an expensive solution.
All i want is my modem to work with a battery when my light goes, before i turn on my generator. So my download dont stops.
Hope you can understand my dilemma fully now![]()
Hero999 said:The problem with that, is that it won't last very long, as soon as the battery voltage drops below 11V it will stop regulating working properly.
A good NiMH AA battery has a 2AH or more rating and can deliver high currents. Eight batteries in series will give you 9.6V nominal, which the modem should tolerate. This should run your modem at 0.5A for at least a couple hours, and probably will run over 3 hours, depending upon the low voltage dropout point of the modem.so how much ampere battery should i get to be able to make the modem run at least an hour.
I think the problem is that your mains voltage is not regulated like it is in modern countries.
Ask somebody in India what they do about the horrible flucuating mains voltage there.