Power Supply

@blisshifi can you explain the configuration of the battery systems you represent?

1.  confirm that you are actually supplying AC to the amp.

2.  If AC, what can you tell us about the specs on the inverter.  Not aiming this comment at you, but I think it is false advertising to tell people they are running off a battery (sounds very stable DC) when in reality they are running off an inverter that they know nothing about and then ther amp is converting it back to DC.   Household emergency power battery systems have basic inverters in them that do not put out particularly clean power.  how do your inverters compare to, for example, the industry standard PA Audio regenerator system.  the PS audio regenerator inverter is measured at .1% THD or better.  for reference the electricity on the grid is 2-4% THD.  (for the readers:  Don't confuse this THD with the amplifier output THD which is a different measurement). 

3.  How do you isolate the charger?  if the charger isn't isolated, then your inverter i is being fed by the charger and the battery is just standing by with no current flowing in or out.

thanks,

Jerry

Hey Jerry,

Great comments.

Yes, the StromTank converts the energy stored by its LFP4 batteries via inverter back to AC. The rated THD per their website is “<2%”. While that is greater than PS Audio’s <0.5% (0.1% is not guaranteed), I can easily say that in my experience, PS Audio products are sonically inferior to the StromTank and Synergistic Research PowerCells… and by a large margin.

In my experience, I’ve found that not everything that is measurable is audible, and not everything that can be heard is measurable. While the inverter itself may remove distortion, there’s no telling what is happening after that stage, how electromagnetic activity after the inverter, how much instantaneous current is being delivered, etc. I owned PS Audio regenerators prior to switching to SR, and have also extensively demoed the P20 against the PowerCell SX a few generations ago and found the PowerCell to be far superior in performance with regards to dynamics, imaging, staging, and natural timbre/tone. This was well before the time that I became a dealer by trade, and I was a PS Audio fanboy prior who was very active on their forums. The PowerCell has since gone through many improvements that make it even significantly better than it was then, and the P20 has not changed a bit. And this is all considering that the PowerCell does not have batteries contained in them.

I’ve found that PS Audio PowerPlants are good with source devices, but amps don’t do so well on them. Many other PowerPlant owners have also preferred to plug their amps directly into the wall instead. The PS Audio forums now have threads that talk about power products that their customer base are now raving about that trump their P20s.

Regarding the isolation of the charger in a StromTank, I will have to ask the StromTank team. I do know there is a button to completely turn off the charging and access to the grid, but I don’t know what the circuitry entails.

When I was using my homebrew solution, the Giandel inverter generated around 3% THD, and I had a connector that I could disconnect to easily remove the charger from the chain.

FWIW, TAS just posted a review on one of the StromTank units yesterday. I haven’t yet read it myself but it’s on my list to get through today. You might find it interesting.

https://www.theabsolutesound.com/articles/stromtank-s-2500-quantum-mkii-battery-power-pack-and-sinewave-converter/

Ok, editing this post, I did read the review. While the reviewer mentions having experience with many other power solutions, he doesn’t make any comparisons against the StromTank. I wish he did! Looking past that, his experience is mimicking mine.

Perhaps what he mentions towards the end in terms of the plusher sound is where the PowerCell 14 is improving upon in terms of dynamics and current delivery. Regardless, being fortunate enough to have both on my floor is a blessing, and I don’t think I can live without either of them.

@carlsbad2 

LOL

Batteries have chargers. Unless you disconnect the charger you are running your charger you are running off the charger power supply which is usually not of high quality since the battery doesn’t require a quality power supply.

The power source is solar and the powerwall doesn't get power from the 'grid'.

  Maybe it is a real improvement but often people in your situation are experiencing confirmation bias.

You don't know me, nor do I know you, so you should think before you judge someone else's experiences.

People in your situation. That's Archie Bunker  right there. 

@kob 

Best of luck with your omipotence.  Love and kisses, Archie.