How fast can marine solar charger recharge a battery?

A discharged battery can be recharged to 70 to 80% fairly fast. Beyond that, the batteries charge acceptance rate slows dramatically. It takes hours to bring the last 20% to full charge.

Therefore, the normal routine is to bring the battery up to about 80% of its capacity. It would be good practice to fully charge the battery at least once per month. This brings our useable battery storage down to about 30% of its capacity.

You can factor in another 20% capacity reduction to account for the aging. This brings your storage requirement to about 4 times your daily demand or 400 Ah in our example. The proper voltage regulation can be provided with a multistage marine voltage regulator.

PWM technology minimizes the problem of overcharging as the charging cycle goes through the three phases of bulk, adsorption and float. Each phase requires a different input voltage. Most boats will spend some time shut down where onboard appliances, lights, etc. must run off of battery power alone.

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