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--- electrical:12v:deep_cycle_battery [2023/06/12 11:24]
frater_secessus [FLA - Flooded Lead Acid] added watering
+++ electrical:12v:deep_cycle_battery [2024/04/15 01:00] (current)
frater_secessus [Chain Store Batteries]
@@ Line 13: / Line 13: @@
 **Note: This article assumes useage of 12v lead chemistries.** If you're using Lithium, this information is not as applicable.  Please see the [[electrical:12v:drop-in_lifepo4|Drop-in Lithium batteries]] article, or for the more industrious the [[electrical:12v:lifepo4_batteries_thread|Lithium Battery DIY thread]] page
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+===== specs =====
+  * Ah (Amp-hours) - the rated [[electrical:12v:battery_capacity|capacity]] of the battery. The basic concept is that a 100Ah battery could theoretically deliver 10A for 10 hours (10A x 10h = 100Ah).  In practice deep cycle batteries are not drained to 0%, and the rate of discharge can affect the apparent capacity.
+  * Wh (Watt-hours) - like Ah above, only multiplied by the nominal voltage.
+    * 100Ah of lead is 1200Wh (100Ah x 12.0v).
+    * 100Ah of LiFePO4 is 1280Wh (100Ah x 12.8v)
+  * cycles - the number of times the battery can be charged and discharged before being considered End Of Life.((EoL is typically considered the point where the battery can no longer produce 80% of its rated output)).    Cycles are usually calculated using a particular [[electrical:12v:battery_capacity|C rate]] and [[electrical:depth_of_discharge|depth of discharge]].
+    * Lead is typically rated at the 1/20th the current as Ah (5A for a 100Ah battery) down to 50% DoD.
+    * LiFePO4 is typically rated at the 1/5th the current as Ah (20A for a 100Ah battery) down to 80% DoD.
+    * both maximum and recommended charge/discharge currents are given [[electrical:12v:battery_capacity|in C]] or Amps.
 ===== Popular Deep-Cycle Lead batteries =====
@@ Line 268: / Line 280: @@
 Further reading:  [[https://marinehowto.com/what-is-a-deep-cycle-battery/|this page]] with further explanation and teardowns to show the difference between deep cycle and "deep cycle" batteries.
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+==== Telco backup batteries ====
+Telcos and other companies that need battery backup rotate their AGM batteries out regularly;  these find their way onto the used market on pallets for relatively low prices.
+These backup batteries are not meant to cycle, vandweller style.  They are designed to live on Float forever then suddently dump their power when grid power goes down.
+Can you make them work for you?  Maybe, but people who can squeeze some use out of them already know what they are doing.

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