Tesla Solar: System Review and Updates

We saw how the Tesla planned output compares to our own prediction using PVWatts. That is all theoretical. Time for a reality check...how does actual output compare to what is expected from the system?  Recall, you can extract a daily and hourly breakdown from PVWatts for the entire calender year....And, you can extract the actual system output from the Tesla app. It records about every 15 minutes. Lets see what we get: Here is my system output on Dec 9, 2020. It was about as sunny as you can get all day in the Denver area. So a best cast scenario. We made 19.3 kwh of energy that day. If you download the data into the csv file, you can get the time stamped output. It's in 24-hr format. Here I highlighted two random times: 1045m and 230pm (1430 hrs) that corrrspsond to 3.2 kw and 1.6 kw total system output. Other times are shown too. Now, we can take out our PVWatts files. In my case for East and South: - pull the values for the same date and time -add them t

How much energy will you make in a year? Your solar PV (Photovoltaic) system's estimated annual energy productiion should be included in your design plan from your installer. The units are in kwh (kilowatt hours).  If you forgot high school physics, do not confuse this with the panels/system power capabilty. Power is described by  W (Watts) or kW (kilowatts). Energy is described by kilowatt-hours (kwh). To understand annual production, first look at production at a moment in time The number of panels and the panel wattage is one metric of the maximun power that can be produced by all of the panels under peak sun at a moment in time (not in a while day). That assumes all panels are being hit equally. For me that is 14 *340W/panel or 4.76 kW. There are many reasons you may not achieve that maximun power level: -split layout (like mine) that has panels in different locations. In this case, the sun strikes the panels vastly different during the day. -Other shading: trees, clouds, sno

Timeline: 2 days after order: Solar layout sent for approval by me. I did not approve it right away. I wondered if I could customize before signing off on it. Timeline: several days after order: Tried texting the given # and emailing the address given to discuss layout and customizing beyond 4kw basic system....no response after a few days so called a bunch of times to reach the PM (project manager). Once I got ahold of him, he was very pleasant  he did say the design could be customized and the cost per watt would not change. They would  look at upsizing to the max allowed (120%) of historical usage....back to design team (updates and communication via text is handy with them) Timeline: ~1-2 weeks after order: Since the first design was so rapid after ordering, I thought redesign would be just as fast. After a few days...nothing. Tried calls to the Project Manager 3 times a day....mailbox was full the first few days so had to keep calling.  (it was expected based on the reviews I rea

Energysage quotes vs Tesla The prices quoted from Energysage were all very close. Competitive amongst themselves. The average quote was $3.12/W. For a 4 kw system in 2020 (26% tax credit): Energysage $3.12 x 4kw=$12,480-$3,245(26% credit)= $9,235 or $2.31/W Tesla $1.49 x 4kw= $5,960 #Solar #Tesla #energysage A difference of $3,275. Would you pay 55% more than you need to? 5-10% maybe.... Breakeven in 16 years or 10 years? 10 for me. Considering Tesla?  Use this referral link to get started and get a $100 award from Tesla after activation. https://ts.la/zach38035 #solar #energysage #tesla