Personal computing discussed
Moderators: renee, mac_h8r1, Nemesis
Captain Ned wrote:Knowing that you're in India and not sure if you live in the parts that have reliable electrical service or are working off an illegal tap to the nearest pole, we need a lot more details.
ludi wrote:If a consumer-grade UPS unit is cutting to battery when a nearby cooling unit operates, then the voltage on the AC mains is probably operating below specification. If so, your only UPS option might be to spend a lot of money on a permanent converter (i.e., AC mains always converted to DC and DC then converted back to AC to supply the load).
Captain Ned wrote:ludi wrote:If a consumer-grade UPS unit is cutting to battery when a nearby cooling unit operates, then the voltage on the AC mains is probably operating below specification. If so, your only UPS option might be to spend a lot of money on a permanent converter (i.e., AC mains always converted to DC and DC then converted back to AC to supply the load).
There's another option if you have an UPS designed to work with 12v batteries.
mnecaise wrote:sounds like you definitely have voltage issues. If that was one of the standard APC Back-UPS 600 models for home and small office use, they don't always interact well with certain power supplies when the voltage dips and the line phase shifts (as it will when a big motor kicks in on the same circuit). Permanent converter (double conversion) UPS will work but is expensive. From what you're describing, the only other option that's likely to work is to find a good quality line interactive UPS with automatic voltage regulation; and, given your situation, you'll need one sized larger than you expect because it's going to spend a lot more time than is typical running. I've had good results with APC Smart UPS and Cyberpower PFC Sinwave. I don't think the Cyberpower is available in India.
Jigar wrote:Captain Ned wrote:I think this UPS has 12 V battery but i think its only 7.5Ah, correct me if i am wrong.ludi wrote:There's another option if you have an UPS designed to work with 12v batteries.If a consumer-grade UPS unit is cutting to battery when a nearby cooling unit operates, then the voltage on the AC mains is probably operating below specification. If so, your only UPS option might be to spend a lot of money on a permanent converter (i.e., AC mains always converted to DC and DC then converted back to AC to supply the load).
the wrote:I may not hurt to grab a current meter to see exactly how much you're pulling. And it never hurts to go a little over kill in this area as if you're not pulling the UPS full load, it can provide longer up time from the battery. In fact, I'm casually looking around locally for a used rack mount data center grade UPS. Even if the batteries are dead I can have them replaced.
I feel your pain about construction. Local construction for me was knocking out power one or twice a month for nearly a year. I was lucky to have purchased a UPS beforehand and in hindsight I consider it to be the best electronics purchase I've ever made. I've used APC and Cyperpower UPS and have been happy with both.
Captain Ned wrote:If the UPS is designed to work with 12v batteries, one can remove the SLA cell and wire in a connection to a 12V car battery. Substantial gains ensue.
http://www.dansdata.com/upsupgrade.htm
http://www.dansdata.com/diyups.htm
madlemming wrote:Most of the UPS these days come with a boost/trim setup to avoid switching over to battery too much.If the voltage is just sagging (brownout condition), you may be better off with a line conditioner - a transformer that will boost the voltage back to nominal. Something like this: http://www.amazon.com/Tripp-Lite-LC1200-Conditioner-Outlet/dp/B0000512LA/
I would especially recommend looking at these if the sag is happening multiple times a day; putting a UPS in that situation will wear down the battery pretty fast with constant charge cycles.
notfred wrote:madlemming wrote:Most of the UPS these days come with a boost/trim setup to avoid switching over to battery too much.If the voltage is just sagging (brownout condition), you may be better off with a line conditioner - a transformer that will boost the voltage back to nominal. Something like this: http://www.amazon.com/Tripp-Lite-LC1200-Conditioner-Outlet/dp/B0000512LA/
I would especially recommend looking at these if the sag is happening multiple times a day; putting a UPS in that situation will wear down the battery pretty fast with constant charge cycles.
I would also be careful replacing the UPS batteries with car batteries for a couple of reasons. First, they are now venting explosive gases that the UPS batteries were not. Secondly car batteries are designed for high current output and hate deep discharge. UPS batteries are designed to cope with being discharged deeply.
notfred wrote:madlemming wrote:Most of the UPS these days come with a boost/trim setup to avoid switching over to battery too much.If the voltage is just sagging (brownout condition), you may be better off with a line conditioner - a transformer that will boost the voltage back to nominal. Something like this: http://www.amazon.com/Tripp-Lite-LC1200-Conditioner-Outlet/dp/B0000512LA/
I would especially recommend looking at these if the sag is happening multiple times a day; putting a UPS in that situation will wear down the battery pretty fast with constant charge cycles.
I would also be careful replacing the UPS batteries with car batteries for a couple of reasons. First, they are now venting explosive gases that the UPS batteries were not. Secondly car batteries are designed for high current output and hate deep discharge. UPS batteries are designed to cope with being discharged deeply.
mnecaise wrote:You've gone from saying you needed something that would run for 15 seconds, to needing something that will run for longer periods.
mnecaise wrote:You've selected a UPS designed for a couple of minutes runtime at 50% load and you're trying to put a big battery on it. The UPS you've selected has a heatsink with no fan, inside a poorly ventilated plastic enclosure. It's thermal design only supports operation for a handful of minutes as it exhausts the batteries it was designed for. It might work for a while...
If you're going to run it for extended periods, you should pick a UPS designed for it.
mnecaise wrote:If you're going to run it for extended periods, you should pick a UPS designed for it.
Jigar wrote:mnecaise wrote:I did some more research and you are right, rather than modifying the current UPS, i better purchase a separate inverter for extended period usage, thanks for the advice.If you're going to run it for extended periods, you should pick a UPS designed for it.
Captain Ned wrote:Jigar wrote:mnecaise wrote:I did some more research and you are right, rather than modifying the current UPS, i better purchase a separate inverter for extended period usage, thanks for the advice.If you're going to run it for extended periods, you should pick a UPS designed for it.
And I linked the DansData article just to show that one can make a seriously long-life UPS if one is willing to get creative with the batteries. If you go that route, do heed his advice to put the batteries in a pan full of baking soda to avoid acid problems, as car batteries aren't sealed.
Jigar wrote:Thanks for the link captain, one of my family member is dealer of ACDelco Car batteries, ACDelco do provide inverter sealed batteries that are designed for full drain purpose also i have a good ventilated space in my house where i think i can dedicate a space specifically for Inverter in few months.
Captain Ned wrote:Jigar wrote:Thanks for the link captain, one of my family member is dealer of ACDelco Car batteries, ACDelco do provide inverter sealed batteries that are designed for full drain purpose also i have a good ventilated space in my house where i think i can dedicate a space specifically for Inverter in few months.
Those batteries make perfect sense for the Indian market and its spotty power issues. Tell that family member to take 2 garlic naan out of petty cash.