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| Hi there, I am buying a boat and want to put a minn kota PD65 (24v) on the bow. The sales guy tells me I only need a 2 bank charger for the trolling motor, and to run my fishfinder and main motor off the cranking battery. Is this the best set-up or should I get a 3 bank charger and have the cranking battery also hooked to it? I'm not to sure what to do.
Buying Crestliner FishHawk1750 sc. With a Honda 75. |
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Member
Posts: 874
Location: Neenah, WI | I would go with the 3 bank. If your cranking battery is down a bit you can top that off at the same time as your trolling batteries. It will also help in the off season for keeping the batteries topped off. |
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| In theory, you only "NEED" a two bank, but 3 is reassuring. |
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| By theory you are looking for a problems if you run a 3 bank charger and one bank to your big motor batterie.The electronic on a big motor are not meant to take 8-9 amps of juice wich could occur with unhealthy batterie |
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| I have never heard this before. So.... I have a couple of questions-
How would the electronics get any juice if the ignition is off ? ?
How do the electronics handle it when the engine is running with an alternetor putting out as much as 30-40 amps (on an outboard) to the start battery?
I am not trying to be smart. I just don't understand what you mean and I have never heard this before.
Thanks in advance. |
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| Hey there guys! The Honda 75 motor has a 16 amp alternator, if this helps any with my question. |
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| T-mac for starter we are possibly talking about 2 different type of batteries and different characteristics.Trolling batteries are typically deep cycle batteries and they maintane there voltage so its a slowy discharge and during use the voltage peak will drop slowly and they are charged the same way with a higher charge back to max voltage with little current this a basic explanation of a battery memory and how it continues to train your batterie everytime you charge and discharge.Its also called excersing the battery(The longer the slope the better).Starter batterie are maintained and designed to not be drained down but to maintane max voltage. If you charge a starter battery with a deep cycle charger you will greatly reduce the life of the battery.Now on my boat the only item that is non functional when the big engine starter switch is off is my big engine and my radio .All other items would be directly recieving the increased current because your voltage reg would be allowing reverse stray voltage.Blown fuses are possible. Maybe someone could correct me if i am wrong but thats why dealers dont do it! There is way to much electronic theory that i could talk about but it would take forever but i hope this helps you Ritch S |
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| I have heard its not good to have your starting battery hooked to a 3 bank charger(24v trolling. Does it damage the battery or not? I am thinking if I get one of the 3 bank chargers that has the automatic shutoff so there should be no chance of damaging the battery. Really not to sure though!! |
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Member
Posts: 874
Location: Neenah, WI | Onboard chargers like the Dual Pro and Guest (there are others) shut off automatically when the battery is charged. You can leave it plugged in for extended periods and it will only charge on demand. It won't hurt your cranking battery. |
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Location: Rhinelander | T-Mac has it right. I use a three bank to be certain. |
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Posts: 284
| For what its worth. I've always used a 3 with no problems. |
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Member
Posts: 3899
| Eyelunker, you couldn't be more wrong. Electronics don't "take" anymore current than they require. And when they are off, they don't take any. No way to damage any of your electronics if they are off, no matter how high a current is available from the main motor, or battery charger. Also, lead-acid batteries do not have memory. My Guest 3 bank is designed for charging and keeping in top condition, my two trolling motor batteries AND the starting battery.
Edited by Shep 4/4/2004 2:59 PM
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Member
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Location: Neenah Wi | I've got a guest 3 bank and 2 go to the deep cycles and the other to the starting battery.That is how they were labeled if I'm not mistaken.I leave mine plugged in when its parked. |
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| Hey shep i didnt say a starter battery or commonly known as lead acid batterie have a memory i did say how ever that trolling batteries do have a memory.I realize electronics dont take any more charge than there designed for and i guess what i was trying to say is yes you can charge a lead acid battery with a deep cycle charger but as theory and design there wernt meant for each other!And also i said the potential problems may arrive later with this setup and yes you are correct alot of poeple do what you guys do. Lets go fishing! |
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| Just wondering you guys that use your 3 banker for starter battery did that setup came like that from the dealer? |
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| good site for basic batterie difference and how to maintaine them! Batteries.HTM |
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Member
Posts: 3899
| Most trolling motor batteries(deep cycle) are lead acid. The technology of spiral cell and AGM for deep cycles is still relatively new. In any case, the deep cycles do not have memory, whether they are lead-acid, AGM, or Spiral cell. |
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| ok shep after doing alittle more reading i agree with yeah lead acid do not have memory .thanks for clarifying that for me. |
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| what about the amps, is a 10 amp good. |
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Member
Posts: 3899
| For trolling motor batteries, 10 Amp is good. The issue with charging deep cycles is heat, and they should be charged the same way they are discharged. Slowly. 5 amps would actually be better than 10, but you may not have enough time to fully charge. 10 Amps is a good compromise. Beyond that, you start creating heat in the battery, which is a no-no.
For the starting battery, the 5 amp bank on my on board has worked just fine.
I had a good link on everything you wanted to know about marine batteries. Unfortunately it doesn't work right now. I will attempt to get it resolved. It is the transcript from a presentation given by the owner of Remy Battery. |
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| I'm thinking on a two bank charger for a total of 10 amps,5 per bank , recovery time is 6-8 hours as per cabela's marine cat. |
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Member
Posts: 3899
| 10 amps, 5 per bank may work OK for you. Depends how hard you work the TM. I know when I muskie fish in the wind for 10 hours+, my batteries really can be drained, and it can take 6+hours to charge them full, with my 10 Amp per bank charger. That would be 12 hours with a 5amp per bank charger. I didn't want to be caught with less than fully charged batteries, so I opted for the 10 amp per bank. |
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