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Home UPS not good enough for a computer

  1. #1
    Junior Member gspal's Avatar
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    Default Home UPS not good enough for a computer

    Home UPS or home inverter-cum-ups give an output voltage on Mains (UPS) of 190v-260v (Mains voltage passed to load without stabilizing). This is just not good enough for powering a computer as it requires pure sine wave 220v or 230v +/- 1%. I searched the net for a home ups that has AVR inserted, but in vain. Home UPS from APC, Su-Kam, Luminous, Microtek, etc. are unable to provide constant voltage output of 220v/230v on UPS mode on mains. They are unable to stabilize the voltage. In other words they do not have an AVR. Is it possible to attach an AVR to the output of a Home UPS like the APC 850va (BI850SINE-IN)? APC is silent on my query and so is Su-Kam.

  2. #2
    Bronze Member Transformer's Avatar
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    I use a pure sine wave inverter from microtek 850va and I have two batteries attached to it in parallel which take a little extra time to recharge but backup is a solid 18-20 hours of continous usage with just the computer on it with a lcd. I do not use a stabilizer as this inverter is meant to do that.

  3. #3
    Junior Member gspal's Avatar
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    Quote Originally Posted by Transformer View Post
    I use a pure sine wave inverter from microtek 850va and I have two batteries attached to it in parallel which take a little extra time to recharge but backup is a solid 18-20 hours of continous usage with just the computer on it with a lcd. I do not use a stabilizer as this inverter is meant to do that.
    No Home UPS (inverter - cum - ups) comes with a stabilizer. I have an APC 850VA (500w) Home UPS along with 150A tubular battery from Eastman. It is a sine wave inverter. When the mains is On the mains voltage is passed to load - inverter: 100-290Vac, and UPS: 190-260Vac. In other words on mains it does not give a stable output of 220v/230v. Only when the mains is Off or when on UPS mode the voltage is outside the range of 190-260v, will the home ups switch to battery mode. That is not the way how a computer and telecom equipment would want the voltage as they need stable input of 220v/230v as the case may be.

    If the input to the APC home ups could be stabilized to a constant 220v/230v +/-1% by an external AVR or stabilizer of (say) 1Kva to the output of which the home ups is plugged in then on mains the inverter too would provide a near about constant output which is what sensitive electronic equipments like that of telecom or computers require. Of course when mains is Off/power grid failure the output of the home ups would be from the battery of 220v/230v as the case may be.

    My query is towards such a constant voltage stabilizer for a home ups.

  4. #4
    Bronze Member Transformer's Avatar
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    gspal what you say makes a lot of sense and I am wondering if I should get a stabilizer to set up before the inverter? I use a dell computer which is supposed to have a supply unit that is robust enough to run without a stabilizer or atleast thats what I was told.

    What do you suggest?

  5. #5
    Gold Member VooDooGirl's Avatar
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    At my home we have a large box attached to the mains line that comes out of the electric meter and that regulates the electricity for the whole house apart from the airconditioners which are not connected through that regulator or stabilizer whatever you may want to call it. ACs have their own stabilizers.

  6. #6
    Bronze Member HareKrishna's Avatar
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    My dad is an electrical engg and he said to me I do not need a stabilizer for my computer. He opened the box to check whats written on the supply unit and he said there is no need for any stabilizer as the supply unit is able to accommodate for large fluctuations and he said let me know if you ever see your computer getting restarted with electricity fluctuation which has never happened so far.
    I am sure the new supply units supplied in India are made according to local needs.

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