My experience with Power Plants (I’ve had a P300, a PPP, a P5, and have now a P10 and a P15) is that the larger the power plant the better the sound. So if you can afford a P10 I’d suggest that.
I very used to dinero limitations, so here’s my thinking:
It would make sense to look at used Power Plants and then get the largest one you can swing.
I have a PP3 to which I power a BHKPre, DSD Mk2, An Innuos Zen, Jay’s, and Phono Pre. Never had an issue. Prior to the latest additions had M700’s as well. Actually considering a second.
What power amps?That’s going to be the biggest factor. The wall can supply 20A+115V = 2300 VA or watts. This will feed the conditioner and from there everything else.
I use a P20 because my two T+A M40 HV amps out put power (550W each into eight ohms) plus everything at another 200 watts is about 1300 watts. One P20 can supply this, so I don’t really need to have a separate circuit for each amplifier to provide the needed 20% head room.
Add up each components watts, you really want about ~20% more available power through the conditioner. The PA Audio units can supply a quick peak VA output in excess of the wall with the capacitor banks.
Don’t guess, your stuff will tell you the right answer. Then you can match or exceed the right answer, but never guess and under spec.
I have had 10, 15, and 20. 10 is gone. just not enough for my multich amps for theater. went to P15. Works great. P20 I got a deal and it is a beast. 2 12" subs (350 watts ea) 1 1800 watt sub and a pair of BHK 300’s. No sweat. When I added my second duel 15" theater sub to the P15, POP. So sadly thats just in a wall socket with a simple tripplite.
I would say P15 best bang for the buck. 2k for P10 you can find used P15 here on this forum as people move to Gryphon for 3-4k.
The conditioner can’t deliver more power than comes from the wall (inefficiencies suggest a 15-20% headroom) sustained. A BRIEF VA capability exists from the capacitor banks. The conditioner gets pretty warm and that’s lost power not going to the devices.
Some conditioners show a percent draw, the P20 for instance, but make sure the total power is realistically supplied. The numbers you report (1800 watt sub?) suggest ONE P20 can manage that (2300x 0.8= 1840 VA) and nothing else using the circuit. These boxes aren’t magic, they CONDITION power, they can’t “make it”. Few run stuff to the limit, so the actual draw is far less than what is possible. Maybe this is the, “no sweat” part for us.