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Tripp Lite Battery Backup 750va $63 shipped @ Amazon

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mxwong

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Tripp Lite AVR750U was on sale for $80 but I found this one for $63 shipped

Backup/Run Time: 4 Minute(s) 750VA Full-load, 11 Minute(s) 375VA Half-load
Battery Recharge Time: 4 Hour(s)
Load Capacity: 750VA/450W
Plugs: 12

http://www.amazon.com/gp/offer-listing/B000DZU02A/?



Reinserting a referral link after I removed it? See ya.


esquared
Ananandtech Forum Director
 
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mxwong said:
Tripp Lite AVR750U was on sale for $80 but I found this one for $63 shipped

Backup/Run Time: 4 Minute(s) 750VA Full-load, 11 Minute(s) 375VA Half-load
Battery Recharge Time: 4 Hour(s)
Load Capacity: 750VA/450W
Plugs: 12
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Click to expand...



What does 750VA/450W mean for load capacity? VA is synonous to W, so I am confused what the 300W difference means.
 
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Martimus said:
What does 750VA/450W mean for load capacity? VA is synonous to W, so I am confused what the 300W difference means.
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Lead acid batteries lose efficiency if drained faster. So those are drain times at that VA level.

VA is the rms wattage in an ac circuit.
 
Martimus said:
What does 750VA/450W mean for load capacity? VA is synonous to W, so I am confused what the 300W difference means.
Click to expand...

Volt amps is apparent power. In AC circuits you have real power (W) and essentially imaginary power (var), volt amps is the sum of these two phasors. Only resistors consume real power, inductors and capacitors consume VARS.

Your computer's power supply has a power factor, probably around .9. So 90% of the volt-amps consumed is due to watts (it's a right triangle relationship though, so there's more VARS than 10% of the VA).

Basically the battery backup can supply 450watts of real power at most, and can handle some loading from caps/inductors (nasty power factor) while maintaining an appropriate angle on the output voltage.

So VA is not synonomous to W. VA is synomomous to S. S = P + jQ where P is power in watts, and Q is reactive power in volt ampere reactive.


They basically advertise the apparent power just to make it seem like the battery backup is more powerful than it really is. Just look at the wattage rating and that will give you a better idea of what it can handle.
 
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EarthwormJim - Thanks for the excellent explanation.

I've read you're not supposed to use consumer-level UPS' (with stepped-sine wave output) on PSUs with Active PFC. Yet, Active PFC is quite common on PC PSUs these days, and computers are what these UPS backups are marketed and targeted for. Is this an actual concern?
 
jrichrds said:
EarthwormJim - Thanks for the excellent explanation.

I've read you're not supposed to use consumer-level UPS' (with stepped-sine wave output) on PSUs with Active PFC. Yet, Active PFC is quite common on PC PSUs these days, and computers are what these UPS backups are marketed and targeted for. Is this an actual concern?
Click to expand...

Just read your PSUs manual and see if it says it is compatible with simulated sine waves. I think it's really only Enermax anyway that has issues.
 
jrichrds said:
I've read you're not supposed to use consumer-level UPS' (with stepped-sine wave output) on PSUs with Active PFC. Yet, Active PFC is quite common on PC PSUs these days, and computers are what these UPS backups are marketed and targeted for. Is this an actual concern?
Click to expand...

I've always read that but have never had a PS problem and I've always used UPS units.

The power fluctuations in this area would have caused many problems without a UPS but everything always comes thru unscathed.

My paranoia finally got the better of me and I changed to a double conversion unit for my main computer and server but the regular units work just fine.

Edit....Wow, Tripp Lite musta made a bad batch of these.....failures all over the place.
 
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Wow the new members seem to be really interested in this thread. 😀 I'd almost guess this was spam. 😉
 
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