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Author Topic:   Trickle charging dual batteries
andygere posted 12-12-2000 07:26 PM ET (US)   Profile for andygere   Send Email to andygere  
What is the proper way to charge a dual battery set-up with a 110V trickle charger? The batteries are configured with a 1/2/Both/Off selector. Should I completely disconnect each battery and charge them seperately, leave them connected, but isolate with the selector, select "Both" and charge through the system or something else? I just bought the charger, and the batteries are fresh this summer, but I'm sure they may need a boost if sitting dormant for too long. Thanks for any help provided.
Hoop posted 12-12-2000 08:29 PM ET (US)     Profile for Hoop  Send Email to Hoop     
Andy,

I was told that I could charge in either the "1" or "2" position, but not in the "Both" position. In the "Both" position, the voltage level of the higher charged battery would determine when to turn "off" the charging, and the lower level battery would not be topped-off.

Hoop

triblet posted 12-12-2000 11:10 PM ET (US)     Profile for triblet  Send Email to triblet     
The lower battery would drag down the
higher battery.

Charging in parallel is a bad idea. I'd get
two trickle chargers and attach one to each
battery.

No need to disconnect, but be sure you turn
off the electronics.

Make sure you got a smart trickle charger
(generally a black box with two LEDs on it).
That will prevent over charging.

My Montauk (one battery) lives on one at
home after a rude surprise in Monterey after
it had set for five weeks.

Tsuriki BW posted 12-13-2000 02:13 AM ET (US)     Profile for Tsuriki BW  Send Email to Tsuriki BW     
Andy,

I bought a Guest 2 bank on board charger for my 14 Dauntless. I have the same battery switch as you but the charger has dual charging cables, one set for each battery.

3 stages, high, slow, trickle so you can keep it plugged in all the time without worry about "frying" the battery.

Small size, not that expensive, easily mounted (I did it with small spacers to allow air flow off the back) and gives me peace of mind that when I take off for a trip my batteries are at peak performance.

BTW is have full electronics as well as an electric trolling motor stern and bow. Battery performance is critical for me. Am very happy with the on-board setup.

Tsuriki

kingfish posted 12-13-2000 03:09 PM ET (US)     Profile for kingfish  Send Email to kingfish     
Take a look at the "BatCat". I have one that I bought through either BoatUS or WestMarine, I forget which, but I have two gel batteries (overcharging will permanently damage gels) and the BatCat will charge them then maintain them at a trickle that will not cause damage, automatically. If I recall correctly, the BatCat comes in two different models, one with two leads (for up to two batteries) and one with four leads (for up to four batteries. Works great for me-

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