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First of all this post is NOT related to the recent PP2000 problems but it has a border, general view.

The recent LX’s posts made me to think about the PP2000 buttery. He reports that his buttery got way weaken from 2009. I used my older PP2000 from December 2008 and my currant problematic “upgraded” problematic PP2000 used the same battery as I got in PP2000.  On this unit I have a very short run from battery – a few minutes at 75% load. The PP2000 indicator shows the battery discharge 50-60% when then unit shot itself down and my PP2000 never do 20% discharge as LX reports.

I do feel that it is some kind of bug in PP2000 charging/discharging/threshold software. However, there is another interesting moment. Even if to discard the recent PP2000 issuers and to look at the performance of my old good sounding PurePower unit before it was sadly “upgraded” then I would note that in the end my unit was more susceptive to internals AC then it use to be 2 years back. 

I did report this sentient a few month back but then I did not have my playback set and it was rather an impression then a fact. The fully functional and properly sounding PP2000 do sensitive to incoming AC, I commented it years back. The difference between properly functioning PP2000 form one AC and another AC is minor but recognizable. The PP2000 still does what it does and the result from ether type of AC is acceptable but why the quality of incoming AC matter? I was writing about it in past but now I can proposer the following: my observation is that the incoming AC influence grows with buttery got weaken. If a year back I have absolutely invariable performance from my playback, then this year I did detect some bad and good electricity days. It was not where even close to the playback running from the wall and the deviations were very minor but since I am very tuned to recognize those things up I think that my observations are correct. I said “I think” as in 2010 there were a lot of other factors that might offset my judgment but I do count all the things in. Gains, all comments that I am masking now refer to my old pre-upgraded and well-sounding PP2000, prior to the current sonic PP2000 issuers.

So, let look at the proposal that batteries dying might be associated with isolation from AC. It does make sense. In the PP2000 after AC got DC-DC converted to 72VDC there are very small caps to kill all residual noise. The reason is because the batteries itself is a phenomenal huge capacitor that with it’s ultra low DCR and ESR shorts all AC to ground. Then, with time, the PP2000 battery got worn. As battery got worn the DCR and ESR rises and the filtering ability descries, perfectly makes sense…

 The PP2000 uses 6 small 12V sealed Lead-Acid battery with suspended electrolyte. The battery does not say how much A/H it has, the stupid unfortunate practice of the today battery makers.  I anticipate it is about 55 H/A and is similar to the APC RBC10 replacement battery. This battery shall last from 3 to 5 years, I guess, if the chagrins-discarding mechanism is compromised than it might begin to die in 2 years.  So, What I would like to do after the PurePower will fix the ongoing problem is to try to use larger buttery and to see if the I get better (deeper) isolation result. The PP2000 has option to externals buttery and I would like to try it, to see if it affect sound in any way. In my case it will be a bit interesting as I have 3 units. I would like to get from somewhere a truly huge battery, let say 1000H/A. This type of the battery will have equivalent series resistance infinitely low and will so low DCR that it will pump hundreds or perhaps thousands of amperes. If I were be able to connect all my three PP2000 to the same buttery (a big questions to PurePower) then it might be a very interning configuration, not to mention that those big “tank/tracks” batteries live much longer then 2-3 years. Sure, I can make experiment with one unit, I just need to find out if the PP2000 will handle suck a powerful charging. As an alternative I might use bank of 80V/300.000uF caps shunting the buttery to see if it is a right direction.

It would be interesting to experiment with it sometimes in future after my PP2000 will be back to expected operation.

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