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--- opinion:frater_secessus:agm2lifepo4 [2024/03/23 13:05]
frater_secessus [Will I need a special LFP solar charge controller?]
+++ opinion:frater_secessus:agm2lifepo4 [2024/03/23 13:13] (current)
frater_secessus [shore power charging]
@@ Line 74: / Line 74: @@
   * 1.0C - typical limit enforced by BMS
-From the battery's point of view, alternator charging rates should probably be ≤0.5C, with 0.4C probably being the sweet spot.  So ≤80A for a 200Ah bank.  From the alternator's point of view, current should be limited to [[electrical:12v:alternator_details#current|what the alternator can comfortably provide]] under expected charging conditions.
+From the battery's point of view, alternator charging rates should be ≤0.5C, with 0.4C likely being the sweet spot.  So ≤80A for a 200Ah bank.  From the alternator's point of view, current should be no greater than [[electrical:12v:alternator_details#current|the alternator can comfortably provide]] under expected charging conditions.
 As the Battle Born quote above suggests, for average LFP banks and average cargo van alternators these criteria will often be met with no reconfiguration.  If the criteria cannot be met then we will need [[electrical:12v:b2b|DC-DC charging]] or some other approach to manipulate voltage and/or current.((diode-based isolator, dedicated second alternator, etc))
@@ Line 140: / Line 140: @@
-IF **other forms of shore power charging are available** or **shore power charging will last at least overnight** the [[electrical:converter|shore power charger]] can be a simple, inexpensive, single-stage charger set to ≤13.4v.  This will allow near full charge and load support without overcharging.
+IF **other forms of shore power charging are available** or **shore power charging will last at least overnight** the [[electrical:converter|shore power charger]] can be a simple, inexpensive, single-stage charger set to a relatively low voltage (13.4v - 13.6v?)  This will allow near full charge and load support without overcharging.
 If **shore power charging is the only source of charging** or if **time on the charger is limited** then a more aggressive, expensive, higher-capacity multistage charger may be warranted.
+If the van will **be on shore power for an extended period** (days, weeks, months) then a small single-stage converter charger set to quite low voltage (13.2v?) would hold the battery at middling states of charge.  It only needs to be a bit bigger than the expected loads so gradual charging can occur.

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