Simple boat maintenance by Manley Pat
Author:Manley, Pat
Language: eng
Format: epub, pdf
Tags: Boats and boating -- Maintenance and repair
ISBN: 1904475027
Publisher: Arundel : Fernhurst
Published: 2005-10-15T00:00:00+00:00
⢠Ideally, all batteries being charged by one source should be of the same type.
⢠A standard alternator regulator will never recharge a battery 50% discharged to above 75% in any reasonable time, because the charging current falls rapidly to prevent overcharging the battery.
A typical 55 amp alternator will start charging at around 40 amps but will be charging at only 10 amps after an hour. It will put into a halfcharged battery only about 20 amp hours in the first hour of charging, Thus in a couple of hours of engine running, a 50% charged battery will at best have been charged to 75% full charge.
⢠An alternator will deliver a very low output with the engine at idle. To deliver a meaningful charge the engine needs to be run at around 50% maximum rpm - see the alternator output curve (in diag. G).
⢠The first hour of charging is the most productive. Each successive hour delivers a considerably reduced charge as the charge current falls, despite the rising voltage - see the fall-off in output curve (diag. H).
⢠Boats that spend most nights
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