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--- opinion:frater_secessus:beginner_mistakes [2022/05/11 12:47]
frater_secessus [Fantasy]
+++ opinion:frater_secessus:beginner_mistakes [2022/05/15 15:29]
frater_secessus [No solar] added chart for ABQ
@@ Line 207: / Line 207: @@
 Having no solar at all is generally an unforced error for vandwellers.  Even [[electrical:12v:alt_and_solar|adding small amounts of panel]] (100w) can make a big difference, and can be added to an [[electrical:12v:alternator|alternator-charged system]] for as little as $100.((100w poly panel on sale for $90, 10A [[electrical:solar:shunt_tweaking|shunt controller]] for $10.))
+==== believing 100w of panel will make 100w all day long ====
+The 100w panel will make 100w in a lab in test conditions.  Your van is not in a lab in test conditions.
+  - the panel will rarely make anywhere close to 100w((under normal conditions))
+  - the max power it //does// make will be around local solar noon.  Before and after that power will be less.
+Example:  Albuquerque, NM  on May 15, 2022.((assuming clear skies, no shade, MPPT, total system efficiency 85%))
+^ Time ^ Watts ^
+|6:02a |0w|
+|7:02a |15.9w|
+|8:02A |32.8w|
+|9:02A |48.7w|
+|10:02A |62.3w|
+|11:02A |72.8w|
+|12:02A |79.39w|
+|**1:02p** - local solar noon |81.7w|
+|2:02 |79.5w|
+|3:02p |72.9w|
+|4:02p |62.5w|
+|5:02p |48.9w|
+|6:02p |33.1w|
+|7:02p |16.2w|
+|8:02p |0w|
+See the //not enough panel// section below.
+==== shade ====
+Shade will wreck solar harvest.  Beginners often don't pay attention to shade conditions, including shade thrown by objects on the van roof itself.
 ==== Worrying ====
@@ Line 238: / Line 284: @@
 Don't get me started on people **flat-mounting poly/mono flex panels to the roof of their van**.  Maximum cost, maximum power loss due to temp derating, //and// with the bonus of blasting re-radiated heat right through the van roof.  It's a crap trifecta.
+=== mixing different panels ===
+Mixing differently-rated panels will always be sub-optimal.  People  who know what they are doing can minimize the losses.  Beginners should either buy identical panels or run different types on separate controllers.
 === Panel types and controllers ===

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