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APC BR1000G Tear-Down

BR1000G vs. SL300

This is the strangest, least-square waveform I can remember seeing from a stepped approximation direct AC inverter feeding my SL300 PSU and LED string. It has soft rising and falling edges with sloped flats. Where power analysis is concerned, I get 117 VRMS with a voltage THD+N of 26% under an 84.9 W load, which actually sounds good. The large current spike at the tip of the slope though? Not so good.

Why does it look so weird? My guess is high stray inductance limiting the current and voltage change rates. The stray inductance interacting with X-class capacitors across the transformer’s outputs would also explain the slight ringing at the FETs’ turn-off.

BR1000G vs. EA-650

With reasonably square voltage waveforms, both my APFC and non-APFC supplies produce similarly square current waveforms. Upon seeing the oddly shaped voltage waveform and unexpected current waveform from my SL300, I had to find out how an APFC power supply would respond, so I threw my PC at it.

Curious gets even more so as the UPS’ output becomes a half-sinusoid closely following the 60 Hz fundamental for the first half of each alternance. The Delta-made EA-650’s APFC circuitry handles the odd waveform like a champ, producing a current waveform that still follows the voltage’s waveform as expected if you ignore the APFC noise.

With my PC pulling 108.6 W and 119.4 VA from the UPS, the UPS put out 118 VRMS with a voltage THD of only 22%.

Not Comparable

In person, the buttons look much dimmer with the cover on than they do on the left. Without the cover, they are uncomfortable to look at.

I went into this tear-down to see how much APC's build quality may have changed over the past 10 years. While the old BX1000 was a Chemi-Con wonderland, this newer model is a Chinese capacitor convention. I was particularly disappointed by the Chemi-Con capacitor on the power supply’s input paired with Jamicon and Chang capacitors on the TOP285’s outputs, as they are critical components in flyback power supplies.

While the output voltage waveforms may be odd square-sinusoid hybrids, neither of my test power supplies had any issues with them, so I’ll shrug them off as acceptable. Otherwise, build quality is par for APC, and kudos is earned for coming up with a cable-free battery hook-up solution.


MORE: APC BN650M1-CA Tear-Down
MORE: APC BGE90M-CA Tear-Down
MORE: APC BE550G Tear-Down

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  • avatar_raq
    Please do a teardown for the APC SUA1500i Smart UPS.
    Reply
  • VVV850
    I would like to see that too.
    Reply
  • bit_user
    Thanks for this.

    BTW, if you setup a kickstarter for funding your reviews, I'll bet you'd get lots of donations. I'd certainly chip in.
    Reply
  • Zaxx420
    Am a regular reader of ur UPS teardowns here at Tom's...having a backround in "EEE", I find them very interesting to say the least. I have an older APC BACK UPS RS-1500 that needs a new battery. B4 I spend on a new batt was wondering if you've reviewed any APC 1500VA 'home' units? Are they decent or should I look at a newer unit instead of a fresh batt?
    Reply
  • Daniel Sauvageau
    18676443 said:
    I have an older APC BACK UPS RS-1500 that needs a new battery. B4 I spend on a new batt was wondering if you've reviewed any APC 1500VA 'home' units? Are they decent or should I look at a newer unit instead of a fresh batt?
    If your RS-1500 is from ~2005, look for my APC BX1000 tear-down. Based on how the BX1000's battery cover says XS1000 and the firmware version says RS1000, I suspect that the RS1500 will be practically the exact same thing except for having that third FET location on the heatsink plates populated and a larger HVDC transformer..
    Reply
  • Daniel Sauvageau
    18676391 said:
    Thanks for this.

    BTW, if you setup a kickstarter for funding your reviews, I'll bet you'd get lots of donations. I'd certainly chip in.
    Glad you liked it.

    For Kickstarter, I do not think a platform where I need to meet a goal to get funds would work too well. Patreon might be more appropriate for my use: contribute monthly, piece-wise or one-off to help me get what I need, when I need it.
    Reply
  • bit_user
    18677660 said:
    Patreon might be more appropriate for my use: contribute monthly, piece-wise or one-off to help me get what I need, when I need it.
    Good point. I'm just thinking of some way that people can chip in to buy you equipment to test. Any extra you might use to fund your time + maybe you can ebay some of the re-assembled units, when you're done. Perhaps it can be setup for people to vote on different models with their contributions, if patreon has a way of creating different projects for people to contribute towards.

    Personally, I'm interested in higher-end UPS models and AV powerline filters (like those from Panamax).
    Reply
  • Tim_103
    You're going to get grief for your use of "spastic".
    Reply
  • WFang
    Yes, a Patreon option would certainly be interesting way to get funds for higher end UPS and powerfilters!
    Reply
  • alextheblue
    18676443 said:
    Am a regular reader of ur UPS teardowns here at Tom's...having a backround in "EEE", I find them very interesting to say the least. I have an older APC BACK UPS RS-1500 that needs a new battery. B4 I spend on a new batt was wondering if you've reviewed any APC 1500VA 'home' units? Are they decent or should I look at a newer unit instead of a fresh batt?
    I'd slap a battery in it if I was you. I mean, you're already got the unit. If it had some other failure or you were lacking a UPS but in the market for one, the BR1500G is probably the best in it's price class. I've got one - if you tear it open it's going to look pretty similar to the BR1000G in this tear-down. It does have a fan which it fires up whenever it's on battery. Again, very decent unit for the money, but it's not going to be built quite up to the standards of the older units. In actual use though this thing has been kick-ass - I needed something with enough oomph to sustain my system for a bit if I lose power while gaming. Gives me time to gracefully exit the game and finish anything I needed to do.
    Reply