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electrical:solar:pvwatts [2023/06/16 13:47]
frater_secessus [results] 		electrical:solar:pvwatts [2023/06/17 13:33]
frater_secessus [SYSTEM INFO] pwm efficiency clarification
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 ===== how much panel do I need to make X watt-hours? ===== ===== how much panel do I need to make X watt-hours? =====
  
-==== choose a location ====+==== GET STARTED ====
  
  
-First, pick a location using the search bar:+First, [[https://pvwatts.nrel.gov/index.php|pick a location]] using the search bar:
  
 {{https://img.mousetrap.net/misc/pvwatts0.jpg}} {{https://img.mousetrap.net/misc/pvwatts0.jpg}}
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 ==== SYSTEM INFO ==== ==== SYSTEM INFO ====
  
- +Change TILT to 0, and accept the other defaults on this page.  The other settings won't make a difference for what we want (Hours of **F**ull **S**un **E**quivalent (FSE), which will be given on the next page). 
-Accept the defaults on this page, as it won't make a difference in this case.  All we want is Hours of **F**ull **S**un **E**quivalent (FSE), which will be given on the next page. +
  
  
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 ===== how much energy can my system harvest? ===== ===== how much energy can my system harvest? =====
  
-==== choose a location ====+==== GET STARTED ====
  
 First, pick a location using the search bar: First, pick a location using the search bar:
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 {{https://img.mousetrap.net/misc/pvwatts0.jpg}} {{https://img.mousetrap.net/misc/pvwatts0.jpg}}
  
-==== system info ====+=== SOLAR RESOURCE DATA === 
 + 
 + 
 +This page shows you the location it selected. Accept the default unless it needs correcting.  
 +==== SYSTEM INFO ====
  
 We need to make a couple changes to the defaults here: We need to make a couple changes to the defaults here:
  
   * your array size in **kW**.  A kilowatt is 1,000w, so a 200w = 0**.**2kW (zero-point-two)((the calculator is set up like this because it is designed to model large residential and commercial installations that are measured in kW))     * your array size in **kW**.  A kilowatt is 1,000w, so a 200w = 0**.**2kW (zero-point-two)((the calculator is set up like this because it is designed to model large residential and commercial installations that are measured in kW))  
-  * accept the default losses for MPPT systems.  PWM systems should use something like 30%+  * accept the default losses for MPPT systems.  PWM systems should use something like 30%((PWM doesn't really have 30% losses in the system;  on average it leaves ~30% unharvested.  The end result is the same, math-wise))
   * if your panels are flat (most are) adjust tilt to zero   * if your panels are flat (most are) adjust tilt to zero
  
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-==== results ====+==== RESULTS ====
  
 The second column is kWh/square meter/**day**, AKA Hours of Full Sun Equivalent (FSE).   The second column is kWh/square meter/**day**, AKA Hours of Full Sun Equivalent (FSE).  
electrical/solar/pvwatts.txt · Last modified: 2024/05/13 12:35 by frater_secessus

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