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Charging dual batteries

Old 10-07-2008, 09:49 AM
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Default Charging dual batteries

Hello all,I've read many of the post but am having a hard time grasping all the important issues regarding batteries.My boat has a single inboard motor.It is set up with two starting batteries(lead and water type).It was set up this way when I bought it.It also has a combiner 50 for charging the batteries.I do understand the basic theory of how the combiner 50 works.The battery that my electronics are hooked up to went dead.Q:shouldn't the battery charge back up when the motor is running or is it possable the battery is shot because it isn't a deep cell?Q:Is a dual purpose battery and a starting battery a good combo to go with?Q:Do the two batteries have to be the same size to charge properly with this system?Q:Can I do damage to any part of the charging system if I switch the battery switch around while the motor is running?Thanks for any replies.
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Old 10-07-2008, 12:30 PM
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Default Re: Charging dual batteries

I would (and did) go with a deep cycle battery for my house (electronics, guages,lights, etc) and a starting that ONLY my engine and the leads from my combiner are connected to.
Nothing special to do or figure out, just get the largest size deep cycle you can fit, connect everything but the engine to it.
Connect engine only to starting battery (and combiner lead of course). Tie the negatives on each battery together (as instructed by combiner manufacturer) and be done.

Your current starting battery is probably dead and that is why it is not coming back to life. You can bring it in and have it tested, but I would replace with deep cycle anyway.

The batteries do not have to be same size (or even type) as long as you are using a combiner and do not have them wired in series or parallel together without combiner.
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Old 10-07-2008, 01:13 PM
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Default Re: Charging dual batteries

Thanks you.That sounds like good advice.
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Old 10-07-2008, 04:17 PM
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Default Re: Charging dual batteries

The rest of your questions. Most battery switches are "make before break" which means that you can switch between 1, 2 or both without a problem with the engine running. You should never switch a battery switch to the off position while the engine is running.
How did the house battery die? Possibly it is not getting a charge. With the engine running and the battery switch is set to the battery you use for starting check the voltage of the house battery 10 minutes after you start the engine and it has run above idle speed. With no electrical load you should see something like 13.3 volts of higher. If that is the case the combiner is working. Other most likely cause of battery death is discharging it too deeply. If you drain a cranking battery too low too many times it will kill it. A true deep cycle will take many more discharges to 50% of battery capacity without killing it. It will wear it out eventually but nowhere near as fast as the same discharges on a cranking battery. Try to charge the house battery up with a shore power charger and take it to your local auto parts store and have it load tested. That will tell you what kind of shape it is in.
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Old 10-08-2008, 09:44 AM
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Default Re: Charging dual batteries

Our Combiners will only charge the second battery if the battery is good. If it won't take a charge, the Combiner will not charge it because that would steal charge from the good battery. 99% of the service calls we get that the Combiner is not charging the second battery are due to this protection feature. This is much better than a parallel switch or relay where both batteries would end up discharged.
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Old 10-08-2008, 10:56 AM
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Default Re: Charging dual batteries

And may I say I have been VERY happy with my Yandina this season (my 1st with it).
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Old 11-25-2008, 03:30 PM
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Default Re: Charging dual batteries

yandina - 10/8/2008 12:44 PM Our Combiners will only charge the second battery if the battery is good. If it won't take a charge, the Combiner will not charge it because that would steal charge from the good battery. 99% of the service calls we get that the Combiner is not charging the second battery are due to this protection feature. This is much better than a parallel switch or relay where both batteries would end up discharged.
yandina (an amateur tech working out of his garage) unjustly blasting BOE (a long time supporter of THT) is an absoluteCROCK!!!

http://www.thehulltruth.com/forums/thread-view.asp?tid=223800&start=1

yandina =
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