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--- electrical:12v:drop-in_lifepo4 [2022/09/14 15:49]
frater_secessus [myth: you must use DC-DC for alternator charging Li]
+++ electrical:12v:drop-in_lifepo4 [2022/09/15 18:29]
frater_secessus [myth: lithium doesn't need absorption]
@@ Line 185: / Line 185: @@
 Overcharging lithium to run the cell balancers is like driving up to every red light at 100mph in order to trigger the ABS.  It's //causing// the problem in order to //solve// the problem.
+==== myth:  lithium doesn't need absorption ====
+Lithium doesn't need Absorption [[electrical:12v:charging#absorption_stage|in the way lead does]].  In some circumstances, however, an Absorption duration can help match [[electrical:solar:charge_controller_setpoints|charging setpoint]] expectations to [[electrical:depth_of_discharge|state of charge]] reality.
+Most charts and tables showing voltage v. SoC assume moderate rates of charge like 0.2[[electrical:12v:battery_capacity|C]] (20A per 100Ah of capacity).  At that rate the charts are reasonably accurate.
+**Very high charge rates**, as sometimes seen with [[electrical:12v:drop-in_lifepo4#mythyou_must_use_dc-dc_for_alternator_charging_li|alternator charging]] or large [[electrical:converter|shore power chargers]], can throw off these chart estimates. 0.8C charging might only yield 80% SoC when one expected 90%. Conversely, **very low charge rates** may result in unintentional overcharge;  98% instead of 90%.
+One rule of thumb is that the bank is fully charged when you are at your target voltage and current acceptance has decreased to ≤0.10C.

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