PurePower 3000 AC Regenerator Review

[wwenze]

No, they don't. They all (including linear power supplies) will only draw (short duration and high) peak currents near the top of the sine. This is what causes the flattening of the top of the sine.
All AC to DC converters work this way.

Only things like simple heaters and incandescent bulbs draw a sine-like current.

Active PFC.

 

[solderdude]

PFC is about the phase of the drawn mains current, not so much the shape of the current being drawn over the entire duration.
This is to ensure most current is drawn at the peak of the mains voltage.
Even with PFC the drawn current from the mains still are short peaks.

 

[wwenze]

PFC is about the phase of the drawn mains current, not so much the shape of the current being drawn over the entire duration.
This is to ensure most current is drawn at the peak of the mains voltage.
Even with PFC the drawn current from the mains still are short peaks.

Active Power Factor Correction Verification Measurements

Active Power Factor Correction Verification Measurements

www.tek.com

 

[solderdude]

Most audio equipment doesn't have (active) PFC.
The high power class-D most likely do have this in though.

In the pro world (PA work) PFC is much more common and/or required.

 

[dinglehoser]

I have 3 Cyberpower UPSs. I bought them because they were the only 1RU fanless sinewave units I could find. Every 2 years or so, batteries die. After getting tired of paying high prices for the batteries, I figured out how to buy the individual batteries for cheap and replace them for half the price. Alas, two of the units have failed in the 5 to 7 years.

I have an APC with Lithium battery that was discontinued. It was expensive but it is going on 5 or so years with no problems.

As a point of comparison, I have a >10 year old Eaton 5PX still (loudly) running on its original VRLA batteries. They still appear to hold >80% of their capacity - during a recent power outage, they ran an average ~200W load for close to an hour without shutting down (the battery pack is 432Wh and the deep discharge protection mode limits the minimum discharge SOC to ~50%). I think the sauce is in how this unit handles battery management, as it appears to perform some sort of algorithmic charge cycling instead of the dumb constant voltage most consumer UPSes use.

 

[kyuu]

As a point of comparison, I have a >10 year old Eaton 5PX still (loudly) running on its original VRLA batteries. They still appear to hold >80% of their capacity - during a recent power outage, they ran an average ~200W load for close to an hour without shutting down (the battery pack is 432Wh and the deep discharge protection mode limits the minimum discharge SOC to ~50%). I think the sauce is in how this unit handles battery management, as it appears to perform some sort of algorithmic charge cycling instead of the dumb constant voltage most consumer UPSes use.

Possible Eaton really has some secret sauce I'm unaware of, you have some sort of unusual sample that is outside of the typical bounds of VRLA, and/or the batteries Eaton are using are optimized for a much longer lifespan than is typical. The APC UPSes that utilize lead-acids which I have experience with (which are enterprise designs, not consumer) have typical battery lifespans of 3 to 5 years. And it's not unusual, if I push the battery replacement out to 5 years, to find the batteries have swelled and need a little coercion to extricate from UPS.

 

[dinglehoser]

Possible Eaton really has some secret sauce I'm unaware of, you have some sort of unusual sample that is outside of the typical bounds of VRLA, and/or the batteries Eaton are using are optimized for a much longer lifespan than is typical. The APC UPSes that utilize lead-acids which I have experience with (which are enterprise designs, not consumer) have typical battery lifespans of 3 to 5 years. And it's not unusual, if I push the battery replacement out to 5 years, to find the batteries have swelled and need a little coercion to extricate from UPS.

Thick plates and conservative cycle depth, probably. The cycling probably helps prevent sulfation. I doubt the sample itself is out of the ordinary - the pack consists of 4x bog standard 12v 9ah units in series.