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--- electrical:12v:battery_capacity [2021/05/03 10:39]
frater_secessus [other than 20hr rates]
+++ electrical:12v:battery_capacity [2022/09/22 12:19] (current)
frater_secessus [C notation]
@@ Line 1: / Line 1: @@
 ====== C notation ======
-**Battery capacity** in Amp-hours is written as **C**.  100Ah, for example.
+**Battery capacity** in Amp-hours is written as **C**.  100Ah, for example. It can also be expressed in Wh (watt-hours) or other units.
 C notation can also be used to describe the **relative amount of current** charging/discharging battery bank. For example a 50A load on a 100Ah bank would be C/2 (100/2 == 50).((technically C/20/2, but that form is rarely seen outside formal documents)). It may also be written as 0.5C.((decimal vs. fractional expression, can be used interchangably))
@@ Line 24: / Line 24: @@
 ===== other than 20hr rates =====
-Because of the Peukert effect, lead bank //measured// capacities are strongly affected by dicharge rate. Sample data below is for flooded lead acid.((Due to lower internal resistance AGM is less affected by discharge rate and lithium is barely affected at all.)  C/20 capacity is multiplied by the factor below to find projected capacity at given discharge rates.
+Because of the Peukert effect, lead bank //measured// capacities are strongly affected by dicharge rate. Sample data below is for flooded lead acid.((Due to lower internal resistance AGM is less affected by discharge rate and lithium is barely affected at all.))  C/20 capacity is multiplied by the factor below to find projected capacity at given discharge rates.
 Example:  our battery is rated at 100Ah when drained at 5A over 20 hours.  If it is drained at 20A in 5 hours it will have an observed capacity of 70Ah (100Ah x .7).

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