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--- opinion:frater_secessus:how_much_excess_solar_power [2022/12/14 14:01]
frater_secessus [empirical testing]
+++ opinion:frater_secessus:how_much_excess_solar_power [2022/12/14 16:16]
frater_secessus [How much extra solar power do I have?]
@@ Line 1: / Line 1: @@
 DRAFT
+FIXME
 ====== How much extra solar power do I have? ======
@@ Line 27: / Line 29: @@
 The downside is this is a YES/NO answer;  it tells you a specific load will run but does not tell you about how much power is actually available.  If you want to see the Bigger Picture then read on...
-===== observation and prediction =====
+===== prediction =====
+==== looking up daily insolation (FSE) =====
+Hours of Full Sun Equivalent (FSE) is a convenient way to think of the amount of sunlight reaching the ground over the entire day.  4.5 hours of FSE means 4.5kWh of power reaching the ground per square meter.
+To predict daily harvest we will use
+  * FSE
+  * your panel wattage
+  * and your system's overall efficiency
-===== average power harvest for a given time/place =====
-==== theoretical power available ====
-=== predicted daily harvest ===
+==== calculating power available (W)  ====
-=== predicted harvest at a specific time ===
 Real-time harvest is a bit easier since there is no time component.  We are working in Watts (W) rather than Watt-hours (Wh). What we are doing is comparing the strength of sunlight reaching the ground (perpendicular) vs [[electrical:solar:output#zenith_angle|the cosine of the angle at which it actually strikes the ground]], or strikes a flat-mounted panel.

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