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dan



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# 261530 2-Dec-2019 14:48
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5S850AU EATON 5S 850VA/510W Tower UPS in good working order . purchased End Aug 2018.

 

few small marks

 

 

 

Still in warranty till Aug 2020

 

 

 

Pickup Henderson , Auckland

 

 

 

two available  95$ each

 

 

 

just ran them both on battery for 30 mins, no issues.

 

 

 


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neb

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  # 2365177 2-Dec-2019 21:30
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If they're pure sinewave output I'd be interested in one (Eaton are really, really good at withholding info on what the output for everything but their high-end UPSes is).

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  # 2365247 3-Dec-2019 00:52
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neb: If they're pure sinewave output I'd be interested in one (Eaton are really, really good at withholding info on what the output for everything but their high-end UPSes is).


Same here for me please, if pure sinewave output, keen on the other one.




 
 
 
 


dan



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  # 2365255 3-Dec-2019 07:02
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sonyxperiageek:
neb: If they're pure sinewave output I'd be interested in one (Eaton are really, really good at withholding info on what the output for everything but their high-end UPSes is).


Same here for me please, if pure sinewave output, keen on the other one.

 

 

 

I had a look but i didnt see any information on it for these models

 

 

 

they cost 275$ @ pbtech new


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  # 2365261 3-Dec-2019 07:10
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What have you been powering on them?




dan



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  # 2365264 3-Dec-2019 07:13
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sonyxperiageek: What have you been powering on them?

 

each one had a desktop PC attached. had them turned off for a few weeks. assume you are wondering why the pic is on my toolbox, i was just charging

 

and testing them in the garage for easy access to 2 powerpoints.

 

 

 

 

 

 


neb

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  # 2367812 3-Dec-2019 21:22
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Finally got the info from Eaton, they're modified square wave :-(.

 

 

Which means that their advertising claim of "Competes against Back-UPS Pro" should really say "Competes against Back-UPS Pro if the Back-UPS Pro had a crappy modified-square-wave inverter in it".

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  # 2367869 4-Dec-2019 06:44
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Can someone explain why pure sine wave vs modified sine wave matters? 

 

What are some things that someone should look for in a UPS?

 

Like, for example, would it matter if I bought one of these to keep my modem online during an outage?





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  # 2368109 4-Dec-2019 13:30
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premiumtouring:

 

Can someone explain why pure sine wave vs modified sine wave matters? 

 

What are some things that someone should look for in a UPS?

 

Like, for example, would it matter if I bought one of these to keep my modem online during an outage?

 

 

 

 

obviously pure is better but frankly it makes little pratical difference to the average end user on what they will be using a UPS in this price range for.

 

 

 

ive told 100's of Eaton, APC and Cyberpower  UPS over last 15 years, few have pure sine wave. they all do the job they are meant

 

for, i have never had any issue with any UPS causing issues for the device it was plugged into  (until said UPS dies)

 

 

 

i generally use UPS on servers/important pcs/routers+network gear for my customer base. i have 2 other of the same models im selling here

 

on my HTPC plex server and router gear, no issues at all

 

 

 

 


neb

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  # 2368469 4-Dec-2019 22:46
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premiumtouring:

Can someone explain why pure sine wave vs modified sine wave matters? 

 

 

"Modified sine waves", more accurately "modified square waves" or "stepped square waves", alternatively "large voltage spikes" depending on the configuration, are probably OK most of the time, but it's taking a risk with your equipment. Some stuff like induction motors will run really badly off them and it may even kill the motor, there will be problems with how some older switchmode supplies implemented power factor correction (PFC), and the biggest factor of all, stepped-square-wave/voltage-spike inverters are anything from lower to much lower quality than pure sinewave inverters (if they were good quality they'd be pure sinewave inverters). Some of them also perform quite badly at boundary conditions, e.g. I've seen stepped-square-wave inverters that become pure square wave inverters as the batteries drain (it wasn't a pure square wave but more square-shaped positive- and negative-going spikes). Not sure what I'd less like to feed into a bunch of expensive IT gear, a high-voltage square wave or high-voltage spikes.

 

 

For example, compare the output of a Smart-UPS, since Eaton were comparing themselves to that, to the Eaton's. The only way that those compare is that they all have black cases and the sockets at the back.

 

 

So, like a driving a car with no seat belts, you can probably get away with a stepped-square-wave/voltage-spike inverter most of the time, but I'd really prefer to do it properly.

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  # 2368470 4-Dec-2019 22:47
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Just as a followup to that, those aren't some random noise spikes displayed on a scope, that's actually what the Eaton UPSes are outputting. It's a credit to the design of modern switchmode supplies that they can survive off that.

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