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opinion:solar:sizing.walkthrough [2022/05/27 18:40]
frater_secessus [where and when we are camping] 		opinion:solar:sizing.walkthrough [2022/05/27 19:09] (current)
frater_secessus [total daily power requirement]
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   * how much power we will require - every single watt   * how much power we will require - every single watt
   * where we will camp, and what time of year we will be there   * where we will camp, and what time of year we will be there
-  * avoiding shade and so the panels can actually work+  * avoiding shade so the panels can actually work
  
  
 ===== daily power requirements ===== ===== daily power requirements =====
  
-This part is the least fun and the most important;  we must account for every watt we intend to "spend" off-grid.+This part is the least fun and the most important;  we must account for every watt we intend to "spend" off-grid.  Some people prefer pencil-and-paper, but doing the work on a spreadsheet (M$ Excel, freeware [[https://www.libreoffice.org/|LibreOffice]] Calc, or free-to-use [[https://drive.google.com/|Google Docs]]) can make the work easier and more organized.  You can also rapidly alter it to model new build ideas.  
  
 The goal is to come up with a daily target in **watt-hours** (**Wh**).  There will be times we have to work in other units but Wh is the main thing.((Wh is independent of voltage))  **Watt-hours are calculated** by multiplying **the load's draw in watts** by **the hours it is expected to run**.    If we run a 4w device for 6 hours that is 24Wh (4W x 6h = 24Wh). The goal is to come up with a daily target in **watt-hours** (**Wh**).  There will be times we have to work in other units but Wh is the main thing.((Wh is independent of voltage))  **Watt-hours are calculated** by multiplying **the load's draw in watts** by **the hours it is expected to run**.    If we run a 4w device for 6 hours that is 24Wh (4W x 6h = 24Wh).
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 We will need **2,084Wh every day** to run our intended loads.  We will need **2,084Wh every day** to run our intended loads. 
 +
 +==== day/night modeling ====
 +
 +You may find it useful to make day/night sections for both AC and DC.  This will yield more accurate numbers if you run many of your loads in daylight instead of at night.  It could save you from oversizing your battery bank. 
 +
 +Note that very big [[electrical:12v:loads|loads]] may require bigger banks to get the current throughput required.  If you have a 120A load but the lithium is only rated to 100A discharge you will need ≥120Ah capacity regardless how small your actual Wh use is. 
 +
  
  
opinion/solar/sizing.walkthrough.1653676848.txt.gz · Last modified: 2022/05/27 18:40 by frater_secessus

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