Equis
Premium
join:2005-03-18
Australia
| Making a small ups last longer
Hello
Can I just add a large SLA battery to a small 500va ups to make it last longer without power?
I understand charge time will be slower and I could still only put max 500va load onto it but wonder if uptime would improve
Thanks  |
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40883644
Premium
join:2003-06-05
Parker, CO
| I have seen this posted before and I have read the replies in the past and just shivered 
DO NOT DO THIS! PURCHASE A LARGER UPS.
You are risking burning down your business, your home or whatever roof you are putting over this and a good fire Marshall will find the cause and you will then play hell getting an insurance company to ante up.
The AC/DC converter / charger is carefully designed by the manufacturer to handle the load of the batteries that ship OEM. A well designed UPS will see the higher CEMF and refuse to charge a higher load as even the OEM batteries can fail and simulate the same results.
There are UPS devices that will go as high as you need. Pictured is our 9000VA / 6500 watt 240V Power Trust that keeps us up and running long enough to safely shut things down when we have outages or brown outs.
For us this is additional insurance compared to the alternative of burning up motors in compressors and presses during extended brown outs not to mention it is dangerous to have equipment suddenly stop while your operating it.
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Rich
»www.highgainantennas.com |
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Equis
Premium
join:2005-03-18
Australia
| reply to Equis
Thanks Rich
You seem to know a bit about this stuff.
Its getting more and more complicated, All I'm after is a way to keep my radios on at each location (13) for a few hours not minutes.
I was going to go the sla and charger but you talked me out of that one |
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40883644
Premium
join:2003-06-05
Parker, CO
| said by Equis  : All I'm after is a way to keep my radios on at each location (13) for a few hours not minutes. Can you explain what your doing exactly? Do you mean during a power outage? A large UPS can stay up for hours if not days if properly selected for the load it will be powering.
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Rich
»www.highgainantennas.com |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
 ·CenturyLink
| reply to Equis
said by Equis : All I'm after is a way to keep my radios on at each location (13) for a few hours not minutes. You need to switch to an "all DC system". You need to get the inverter out of the loop to remove the conversion inefficiencies that are squandering your battery power.
Sounds complicated....but it really isn't. Search here for more information. There have been some long discussions regarding this very subject.
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A is A |
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AMD Phreak
Premium
join:2003-12-14
1 edit | »www.lamarchemfg.com/web/telecom.htm
This is what you are looking for.
If thats too much, look into building your own UPS using charge controllers and what not
»www.tessco.com/products/displayP···oupId=32
Or
»www.tessco.com/products/displayP···oupId=15 |
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public
join:2002-01-19
Santa Clara, CA
·DSL EXTREME
| reply to 40883644
said by 40883644 :IThe AC/DC converter / charger is carefully designed by the manufacturer to handle the load of the batteries that ship OEM. A well designed UPS will see the higher CEMF and refuse to charge a higher load as even the OEM batteries can fail and simulate the same results. That is simply nonsense. The charger is current limited because high rate will damage small batteries.
A large battery will charge slowly. For safety each pack should be separately fused.
One concern is the inverter heat sink. It may be too small for extended run time, relying on quick shutdown before the inverter overheats.
A major concern regarding small UPSs is the shoddy design, and even shoddier quality of parts and assembly. Do not rely on small cheap UPS to power a critical device without rebuilding the UPS. |
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VariableARK
join:2003-03-17
USA | public what ups do you like to use on your sites? do you strip out less expensive ups for better batteries? |
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gpilot
join:2006-04-29
Napa, CA | I've seen small solar units for under 200 bucks as a cheap backup solution (200 or 300 watt) thats enough to power a radio (just). |
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Equis
Premium
join:2005-03-18
Australia
| reply to Equis
Thanks for all these comments!
Yep, I've done a search on this forum and real alot (many different opinions)
I only need 12v 1 - 2 amp to last 10 hours that it.
Just for remote sites with crappy power
Thanks Again |
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Equis
Premium
join:2005-03-18
Australia
| I'm looking at this now.
»www.renewablestore.com.au/batter···1208.pdf
Can any of you power gurus tell me if that would be suitable for our radios (noise etc)
Thanks |
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aeronet
join:2002-04-05
San Juan, PR
| reply to Equis
Triplite has an small 700 watts Inverter Charger that does not include batteries and is designed to add AGM/Gel type Batts... I saw them at the local Sams Club for about $150.00
»www.tripplite.com/products/produ···tID=3298
use this so Rich wont Panic! |
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lutful
Premium
join:2005-06-16
Ottawa, ON
| reply to Equis
This is a decent 8A switching-mode charger with over-current protection and low output ripple.
You can hook it up to multiple batteries and a few radios without risk of fire. |
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Equis
Premium
join:2005-03-18
Australia | Thanks! |
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