Differences

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--- electrical:solar:charge_controller [2020/08/15 21:26]
frater_secessus [MPPT]
+++ electrical:solar:charge_controller [2020/11/04 16:50]
frater_secessus [how to choose]
@@ Line 53: / Line 53: @@
 **PWM is a reasonable default choice** in most situations((12v house power, 12v panels)) because they work well enough and are inexpensive. PWM controllers can cost half or a third of their MPPT workmates for any given rated output.((10A, 20A, 40A, etc))
 If more power is needed (and there is physical space) additional PV can be added to match the charging output of an MPPT charger, often at a lower cost.  [There are no prizes for fanciest or most expensive charge controller!  Do what is best for you -- frater secessus]
+PWM's limitations are reduced when [[electrical:12v:alt_and_solar|other forms of charging are present to help]].
 There are also edge cases((low altitude, high temperature, Absorption)) where PWM can actually make more power than MPPT on poly [[electrical:solar:panels|panels]] during Absorption stage in very hot weather, due to MPPT DC-DC conversion losses and [[electrical:solar:output#panel_temperature|temperature derating]].

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