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--- opinion:frater_secessus:how_much_excess_solar_power [2022/12/14 13:50]
frater_secessus [system efficiency]
+++ opinion:frater_secessus:how_much_excess_solar_power [2022/12/14 14:01]
frater_secessus [empirical testing]
@@ Line 21: / Line 21: @@
-===== empirical testing =====
+===== direct testing =====
+Plug it in and see if the solar can support it [[electrical:solar:offthepanel|without affecting the battery bank]].  Easy peasy.
-===== observation and prediction =====
+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 =====
-==== overall system efficiency ====
-You can get a feel for overall system efficiency by
-   - watching your system over time, as described above
-   - comparing real-time harvest to theoretical harvest
@@ Line 54: / Line 52: @@
 **Example**: if you have 200w of panels and calculated cosine is .70 then **140w of light is landing on your panels**.
-==== system efficiency ====
+==== finding and using system efficiency ====
 For [[electrical:solar:output|various reasons]] your solar setup will not be able to harvest all the power landing on the panels. For systems with PWM controllers the percent harvested will be something like 70%.  For MPPT it might be 83%.  These constants will be placeholders you can use until you figure out your specific system's overall efficiency.

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