Re: [Amel Yacht Owners] First Impressions: Firefly Batteries.
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You are correct and incorrect :) Modern chargers typically operate in three different modes: bulk, absorption, and float. In bulk mode, the charger determines the current (it is operating as a constant-current source), and that current is usually the maximum rating of the charger. In this mode, it adjusts the output voltage to maintain the desired current. The voltage steadily rises as the battery charges until it reaches a certain point, then the charger switches to absorption mode. In this mode, it operates as a constant-voltage source, and the current is determined by how much the batteries will soak up (it steadily decreases). Eventually the current drops below a certain threshold (or a timer expires) and it switches to float mode, which is similar to absorption mode but a lower voltage, and the intent is to not have any significant current flowing into the batteries at all -- just offsetting their self-discharge. Most chargers can provide up to their full current in float mode if necessary, so if you turn on an appliance it is actually the charger providing the power and not the battery (or only a tiny bit from the battery).
SM 233 Iteration
Boston, MA, USA
On Fri, Dec 15, 2017 at 1:01 PM, Thomas Peacock peacock8491@... [amelyachtowners] <amelyachtowners@...> wrote: