Surely the manufacturers wouldn't expect those boat owners with "maint. chargers" to disconnect them every time they went out??
Or are you saying that it's ok to have it connected, just not powered?
(thinking out loud here, correct me if I go astray...) The charger is a power supply. If there's a diode and a current limit resistor, it should be protected. If the charger gets unplugged, while the battery is still attached, the diode keeps the battery from discharging into the charger. If the voltage goes up (from an alternator), the diode should still prevent back current into the charger. If the voltage of the battery / system goes down due to heavy load, the current limit resistor should keep the power supply (charger) from being able to source more current than it was designed to. IF that should be exceeded, there should be thermal limits in the regulator devices that shut down the regulator.
In the case of one of my chargers, there's also a fuse that blew. Though now I have to go back and figure out if it's because of running the charger when the motor was running (trying to drain too much power from the charger - which should have been protected as described above), or if it was from some dufous switching the leads at some point. Though one would think that if the leads had been swapped, OR EVEN if it was just overcurrent that blew the fuse, the little green LED on the charger shouldn't stay lit....
John
From: don cavers <doncavers@yahoo.ca>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Thursday, October 25, 2012 8:26 PM
Subject: [Electric Boats] Re: Lead battery charging
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Thursday, October 25, 2012 8:26 PM
Subject: [Electric Boats] Re: Lead battery charging
A fast way to kill most chargers is to draw power while they are connected. The charger is designed to 'push' amps against the resistance of the battery. If you draw power you are bypassing that resistance and it is easy to overdraw the charger, and fry it. That is why some chargers have a "start" position whose use is supposed to be limited to seconds.
Don
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