What is your reserve percentage set to and why?

[BrettS]

The Tesla app hides 5% of the charge - 0% reading in the app is actually 5% of charge in the PowerWalls. The TEG's web interface shows the actual charge level - 5% in the TEG is 5% actual charge.

Since the Power Reserve % is set in the app, that means you can't set it below 5% of the actual charge level, evidently providing the reserve power needed to keep the PowerWalls and TEG operating.

It’s actually weirder than that. It’s not a straight 5%. At the lower end it’s 5%, so when the app shows 5% the web interface shows 10% (it’s also worth nothing that the powerwalls will turn off at this point. They won’t run themselves all the way down to 0% in the app or the web interface).

Then as you approach a full charge the two numbers converge. At 33% in the app the web interface will say 36%. At 66% in the app the web interface will say 68% and they will both read 99% at the same time.

I’ve also seen it speculated that even the number shown in the web interface is not the actual SOC of the battery and there is some additional reserve built in, but I’m not sure anyone but tesla really knows for sure.

 

[bob_p]

We have 4 PowerWalls - theoretically able to hold 54KW of charge.

The Tesla app appears to hold 5% of the charge in reserve - so 0% in the app means the PWs have 2.7KW of energy - and the Tesla app is measuring only 51.3KW between 0% - 100%. 100% means the PW has 51.3KW plus 2.7KW or the total of 54KW.

As the charge gets close to 100%, the app and website will be the same.

When the Tesla app reads 50% - the charge level will be 51.3/2 + 2.7 = 28.35 KW. The website will read 52.5%.

It is confusing the app and website are providing different readings, which could be explained by just providing a note on the app display indicating the app is holding 5% in reserve...

 

[aesculus]

I have about 5kW of solar. Normally I run my reserve in the summer at 50% and usually don't get near it by Friday end of peak.

But this week with all the smoke I had to set it to 40% yesterday and it got down to 42% EoP last night. Might have to go lower again tonight but the real fear is that fire danger, and potential power shutoffs, are higher today.

 

[jakespeed]

i'm set to 5% b/c i have a generator

 

[Kevrick]

35%

 

[JoelDug]

I was set at 35%. But after reading this whole thread I think I will boost it. I only have a 5.3 kW solar system, so the only way to fully charge my 2 PWs is to set the reserve to 100.