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--- electrical:solar:slim_reserve [2018/06/19 20:25]
frater_secessus [fractional reserves]
+++ electrical:solar:slim_reserve [2022/10/11 19:32]
frater_secessus [Slim battery reserves]
@@ Line 1: / Line 1: @@
 ====== Slim battery reserves ======
+FIXME:  edit/organize
 Note:  this section is likely not appropriate for newbies;  if the ideas are implemented incorrectly it could result in [[electrical:batterycide|battery murder]] and disappointment.
@@ Line 6: / Line 8: @@
-===== fractional reserves =====
+[[electrical:solar:sizing#your_reserve_needs|Days of reserve calculations]] usually assume //poor solar harvest// == //zero solar harvest//.  In reality this is almost always incorrect;  //some// solar power is harvested even under dark overcast or rainy conditions.
+> In normal full overcast I see yields 20% of usual.  In dark full overcast, as when storming, I see yields 5-10% of usual. -- secessus
+A **fractional reserve** might be a half- or quarter day of battery reserve.  This takes into account the (reduced) contributions from your solar, alternator, etc.  It may also require going into voluntary [[electrical:solar:rationing|power-rationing mode]] when solar output is very low.
+In areas with abundant and consistent [[electrical:solar:output|insolation]] like the desert southwest, you may be able to run with no reserves at all, just enough make it through the night.
+===== techniques =====
+making more power
+  * [[electrical:solar:overpaneling|Overpaneling]] (having extra panels) is a key technique
+  * addimg [[electrical:12v:alternator|alternator]] or other forms of [[electrical:12v:alt_and_solar|additional charging]].
+using less power
-Days of reserve calculations usually assume //poor solar harvest// == //zero solar harvest//.  In reality this is almost always incorrect;  //some// solar power is harvested.
+  * Time-shifting loads to [[electrical:solar:nonessential|periods of excess power]] will help keep the solar fully-utilized and bank fully charged until the sun goes down.
+  * finding and disabling [[electrical:12v:loads|parasitic loads]]
-Typical
-===== zero reserves =====

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