Most people incorrectly think that when their solar controller drops to float voltage, that the battery is fully charged.
This does not mean that, only that the controller held absorption voltage as long as it was programmed to do so.
How long one is required to hold absorption voltage and what that ideal absorption voltage is is different for every battery, different as it ages, and different when starting from different levels of discharge.
I recommend any quality solar controller, PWM or MPPT, which allows one to tailor Absorption voltage and Duration.
One wants their batteries to have achieved Absorption voltage by Solar by 1PM at the latest. More solar than this is not wasteful, it only makes for happier longer lived batteries, and more of a buffer in bad weather.
