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--- electrical:solar:nonessential [2019/10/01 13:05]
frater_secessus [when to run opportunity loads]
+++ electrical:solar:nonessential [2020/01/13 11:19]
frater_secessus [how much surplus current is there?]
@@ Line 1: / Line 1: @@
 ====== opportunity loads ======
 {{ :electrical:solar:discretionaryv5.png?direct&400|based on http://www.chargetek.com/basic-information.html}}
-Solar power installations are generally [[electrical:solar:sizing|designed]] as if the load[s] will be steady around the clock.
+Solar power installations are generally [[electrical:solar:sizing|designed]] as if the load[s] will be steady around the clock.  This can lead new folk into buying [[opinion:frater_secessus:beginner_mistakes#too_much_battery|too much battery]].
 In practice, actual loads may be heavier in the daytime (as when working with power tools) or at night (as when watching movies or running a forced-air furnace).
 Due to the nature of battery charging there are better times and worse times to run non-essential loads.  If done attentively (or automatically) **one can run electrical loads that do not affect the battery's
-[[electrical:depth_of_discharge|State of Charge]]** at all.
+[[electrical:depth_of_discharge|State of Charge]]** at all.  This is especially true for Lead-Acid chemistries that do not take much current in [[electrical:12v:charging|Float or late Absorption stages]].
-This is especially true for Lead-Acid chemistries that do not take much current in [[electrical:12v:charging|Float or late Absorption stages]].
 ===== how much surplus current is there? =====
-It is common for Lead-Acid batteries to consume C/100 or C/200 amps to Float, meaning that **during Float** you will have 99% or more of your panels' output available for loads.((normal + opportunity))
+It is common for Lead-Acid batteries to consume C/100 or C/200 amps to Float, meaning that **during Float** you will have **at least 99% your panels' output**((under present conditions)) **available for loads**.((normal + opportunity))
 **During Absorption** the charge current is tapering down as the battery accepts less;  the more it tapers down the more is available for loads.((agaom. normal + opportunity))  At the very beginning of Absorption ~0% of "bonus" output is available.  At the very end of Absorption ~99% is available.  Mid-way through Absorption((judging by current not time)) ~49% of the panels' output is available for loads.

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