It's been a couple of years.... but I looked fairly heavily into the Enphase battery offerings in 2021. The 5P appears to be quite similar, with perhaps a bit better specs when it comes to output. In comparison to PW, the Enphase did not meet my goals. There was a limit of 25 kwh per installation, and the 5P appears to say 20 kwh. If you want to target more, you might ask your installer about the possibility of installing 5Ps now and adding PWs later. Or, make the decision later - if my 2022-2023 installation experienceis any indication, you'll know if Tesla produces the compliant PW before your system gets into operation anyway.
As the resident Enphase battery owner on this Tesla forum, I don't think the 5P even existed back in 2021. The main negative in the past with Enphase was really cost vs. PW and power output was lower if you only had 1 or 2 batteries (like 3.84kW max output for 1x 10 kWh battery). For me, 2x 10s can drive 7.68kW.
Back in 2021, I got their older Encharge 10 batteries (10 kWh), but having originally wanted the Tesla PW2, I did my research and went with Enphase for many reasons. I think the Enphase battery (consumer) solution is actually much better than what Tesla offers.
Back then, I think the Enphase limit was like 60 kWh total batteries, but I've seen videos and I think you can stack up to 80 kWh now of 5P batteries. They also come with a 15 year warranty vs. 10 for Tesla and probably similar to PW3, is air cooled being LFP so no need to worry about pumps or whatever breaking that you read about (or it leaking coolant). There is no coolant w/ Enphase. It's also quieter as there are less/no moving parts like a pump in the PW2. With the Tesla PW3, you are also forced to use string inverters if you don't want to go that route. You may also have utility export limits (I read that here).
The 5P battery is 5 kWh. Also, if you want a generator, that works right now from Enphase to charge up your batteries if no solar and you can use batteries at night, etc...They are working on V2H for 2025 I think. There is a snazzy video on their website.
I've also called Enphase support to resolve cases and you can even take all their university courses and get full installer access to your stuff.
Unless you have to be in the Tesla eco-system since you own all Tesla cars, I think Enphase is simply the better product in the consumer space.
And yes, I am biased.
Last thing I remembered is I read Tesla keeps turning off and on your solar generation (someone else can probably explain this better) since it can't tweak the inverter frequency down to miniscule amounts or something, but Enphase doesn't do this.
