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Showing posts with the label NREL

January 2021- Solar Output Update

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January 2021 is almost over.Two more days to go...how will we perform against our predictive PVWatts model?  Lower, higher, on targer? We have to wait and find out! Its been a mix of sun , clouds, and a few snow days. In the mean time, I can say output is clearly rising on full sun days. Peak output time is about 1130am now. Outputs are now sustaining 3.3-3.5 kw for an extended time. I have noticed shorter surges to 3.7-3.8 kw. Here is the best day of the month so far, 21.4 kwh.  On this day, our predicted solar AC output was 3.04 kw at 11am. We were doing a steady 3.4 kw though. That's 11.8% higher than expected  Maybe Tesla Solar hooked me up a good production lot! Lets see sunday night if we are close to the 420 kwh target. Well still a positive recommendation for Tesla solar in thebDenver area. Use my referral link to receive 1,000 free Supercharger miles with the purchase and delivery of a new Tesla car, or earn a $100 award after system activation by purchasing or

Solar journey: Design and predicting annual production. Part 2

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Tesla's plan estimated annual production at 6622 kwh. I have not designed a system before nor had one. It is close to what other quotes called out. Aside from waiting a  year to see, is there a way to run the numbers your self? The answer is yes. The National Renewable Energy Lab (NREL) has a user friendly site an calculator to help you do this. Its called PVWatts. Link below: https://pvwatts.nrel.gov/ PVWatts requires your location so it can use its database to determine the seasonal average solar radiation (accounting for weather). Once you enter.your location, it is on to.entering the PV  system properties If you have all of your panels in one direction, this easy. In my case, the panels are split between East and South....so I have to enter each half separately, then add them together to get the total  system estimate. PVWatts provides typical default numbers. Here is what I entered using my Southern string as an example: -Half system size=2.78 kw (7 pan

Solar journey: Design and predicting annual production. Part 1

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

Solar journey....Energysage vs Tesla

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