Differences

This shows you the differences between two versions of the page.

--- electrical:solar:panel-bank_ratio [2020/06/24 22:32]
frater_secessus [1:1]
+++ electrical:solar:panel-bank_ratio [2021/11/07 16:11]
frater_secessus [battery health] added Li charging info
@@ Line 9: / Line 9: @@
 Working backwards, fully charging lead-chemistries by 1:1 solar means requires about 8.45hrs of Full Sun Equivalent on MPPT, and about 9.7hrs FSE with PWM. **There is nowhere in the United States that averages 8.45hrs of FSE year around**.  The highest is Honolulu with an average of 5.96hrs. The highest monthly average is Las Vegas in June (7.69hrs).
-Fully-charging becomes possible with attentive panel tilt, requiring only 5.5hrs on MPPT and 6.4hrs on PWM.
+Workarounds:
+  * add [[electrical:12v:alt_and_solar|another source of charging]]
+  * fully-charging lead becomes possible with attentive panel tilt, requiring only 5.5hrs on MPPT and 6.4hrs on PWM.
+  * fully-charging lead becomes possible with shallower cycling, like 75%.  This is the equivalent of the 2:1 systems below.
 ===== 2:1 overpaneling =====
@@ Line 38: / Line 42: @@
 Different battery types have different charging requirements:
-  * lithium - no minimum, charge at any rate up to the max
+  * lithium - no minimum, charge at any rate((see [[electrical:12v:drop-in LiFePO4#an_approach_to_greater_longevity|this article]] on gentler charging for longevity)) up to the max
   * flooded lead-acid:  minimum [[electrical:12v:battery_capacity|C]]/10 (10A per 100ah of capacity)
     * minimum ratio with MPPT = 1.25w:1ah

RV and vandwellers wiki

User Tools

Site Tools

Differences

Page Tools