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--- opinion:solar:sizing [2022/05/24 15:11]
frater_secessus [solar sizing - the Big Picture]
+++ opinion:solar:sizing [2022/05/24 15:12]
frater_secessus [days of reserve]
@@ Line 20: / Line 20: @@
 Your **reserve requirements** will profoundly affect the size, complexity, and cost of the system.
 Sizing for an overnight camping trip is easy;  sizing for a three day trip a challenge;  sizing for a long trip or full-time vandwelling is serious business.  See the bottom of this article for example configurations.
+===== battery bank =====
+Once you know your daily power and reserve requirements you can spec out a battery  bank.  The capacity and chemistry of the bank will drive much of the charging section below.
+Having an **undersized bank** means //running out of power// at night.  Sitting in the dark at night with no fan.
+Having an **oversized lead bank** for your charging ability results in [[electrical:batterycide|battery murder]] and replacement.  Having an **oversized lithium bank** is $$$ and can strain the alternator if [[electrical:12v:b2b|a current-limiting isolator]] isn't used.
+IMO, with lead chemistries((flooded, agm, gel)) it is better to have an undersized bank you can charge //fully and consistently// rather than a bigger bank you cannot charge.
+You will **need somewhat more Ah capacity**
+      * if you have undersized solar
+      * you have lead-chemistry battery bank
+You will need **somewhat less Ah capacity**
+    * if you run loads in the daytime instead of at night
+    * if you have [[electrical:solar:overpaneling|oversized solar]]
+    * you have lithium-chemistry battery bank((can be ~0.62% the size of the lead bank, due to deeper [[electrical:depth_of_discharge|DoD]].))
@@ Line 136: / Line 158: @@
   * you have a lithium battery bank but camp in long stretches with minimal solar.  In this model you would charge the batteries full blast((up to [[electrical:12v:battery_capacity|0.5C]])) for a few hours every few days.
   * you have enough solar to [[electrical:12v:charging|Absorp/Float your lead batteries but not enough for bulk]].
-===== battery bank =====
-Having an **undersized bank** means //running out of power// at night.  Sitting in the dark at night with no fan.
-Having an **oversized lead bank** for your charging ability results in [[electrical:batterycide|battery murder]] and replacement.  Having an **oversized lithium bank** is $$$ and can strain the alternator if [[electrical:12v:b2b|a current-limiting isolator]] isn't used.
-IMO, with lead chemistries((flooded, agm, gel)) it is better to have an undersized bank you can charge //fully and consistently// rather than a bigger bank you cannot charge.
-You will **need somewhat more Ah capacity**
-      * if you have undersized solar
-      * you have lead-chemistry battery bank
-You will need **somewhat less Ah capacity**
-    * if you run loads in the daytime instead of at night
-    * if you have [[electrical:solar:overpaneling|oversized solar]]
-    * you have lithium-chemistry battery bank((can be ~0.62% the size of the lead bank, due to deeper [[electrical:depth_of_discharge|DoD]].))

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