Hi folks,
I'm very late to the party due to moving twice in 3 years. But we're finally in a house that can support plenty of solar without any shade and we're not moving for a long, long time.
I've been spending all day reading this forum. Lots of great info.
We have a new 23x425w PV system on all four sides of our house, plus a PW+ and a Founders PW2 and Tesla Gateway (both referral awards, woot!)
There are four strings for each face of the house, and the largest string faces south (luckily)!
Since we have three A/C units and a hot-tub, I requested that we have a partial-house backup instead of whole-house, and Tesla was able to do that for us.
Why? Mainly because if we have a powercut and we're not home, I didn't want the A/C and hot tub to drain the PWs before we could shut them down. I want maximum backup battery time.
You can see two service panels in the second photo, the left panel is the non-essential loads and the right panel is the essential (backed-up) loads.
The system is working great so far (it's only been two somewhat cloudy days).
My first two questions are:
1. Obviously the 2 PWs only backup the essential loads panel. But what about solar generation? Will the solar energy supply both panels, or just the essential loads? I'm trying to wrack my brain to figure out the power flow, but I can't quite figure it out. For instance, say the PV is generating 8kW and the PWs are full. The essential loads (EL) are pulling 2kW and the non-essential loads (NEL) are pulling 4kW, so 6kW total demand, leaving 2kW left over. What gets sent back to the grid -- 2kW (8PV -2 EL -4 NEL) or 6kW (8PV - 2EL)? If only the essential loads gets the solar and 6kW is sent to the grid, wouldn't that energy just essentially "turn around" and power the NEL panel? I'm trying to figure out how this works.
2. See the third image below from the phenomenal Powerwall_Dashboard docker app. How do I fix the Y axis on the top chart? I've tried changing the Y axis to say 10kw, but that messes up the sun dashed line. I can't get it to look like all the other well-formatted graphs I see.
I'm sure I'll have many more questions as I get familiar with all of this. I don't yet have PTO, but I'm seeing some real strange data in the Tesla app, but I'll explain that in a follow-up post.
Thanks.
I'm very late to the party due to moving twice in 3 years. But we're finally in a house that can support plenty of solar without any shade and we're not moving for a long, long time.
I've been spending all day reading this forum. Lots of great info.
We have a new 23x425w PV system on all four sides of our house, plus a PW+ and a Founders PW2 and Tesla Gateway (both referral awards, woot!)
There are four strings for each face of the house, and the largest string faces south (luckily)!
Since we have three A/C units and a hot-tub, I requested that we have a partial-house backup instead of whole-house, and Tesla was able to do that for us.
Why? Mainly because if we have a powercut and we're not home, I didn't want the A/C and hot tub to drain the PWs before we could shut them down. I want maximum backup battery time.
You can see two service panels in the second photo, the left panel is the non-essential loads and the right panel is the essential (backed-up) loads.
The system is working great so far (it's only been two somewhat cloudy days).
My first two questions are:
1. Obviously the 2 PWs only backup the essential loads panel. But what about solar generation? Will the solar energy supply both panels, or just the essential loads? I'm trying to wrack my brain to figure out the power flow, but I can't quite figure it out. For instance, say the PV is generating 8kW and the PWs are full. The essential loads (EL) are pulling 2kW and the non-essential loads (NEL) are pulling 4kW, so 6kW total demand, leaving 2kW left over. What gets sent back to the grid -- 2kW (8PV -2 EL -4 NEL) or 6kW (8PV - 2EL)? If only the essential loads gets the solar and 6kW is sent to the grid, wouldn't that energy just essentially "turn around" and power the NEL panel? I'm trying to figure out how this works.
2. See the third image below from the phenomenal Powerwall_Dashboard docker app. How do I fix the Y axis on the top chart? I've tried changing the Y axis to say 10kw, but that messes up the sun dashed line. I can't get it to look like all the other well-formatted graphs I see.
I'm sure I'll have many more questions as I get familiar with all of this. I don't yet have PTO, but I'm seeing some real strange data in the Tesla app, but I'll explain that in a follow-up post.
Thanks.