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bunkergroup

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Posts: 315
Reply with quote  #1 
I intend on installing a 1,2,both switch too combine my batteries when running a anchor winch. . my batteries are independent of each other , port and starboard motor twin 75's. I carry jumper leads in case of the need to tie the batteries.
I intend to run the recommended wire size for the winch from the batteries forward up to a combination switch mounted next to the winch control panel so I can combine the batteries for winch use . What effect will the combining have on the charging current coming from the motors, They will be running when motoring up on the anchor to retrieve it, I may forget to unconbine them which would result in both motors charging when at high rpm when batteries are combined. The winch has a 1400 watt motor my batteries are century 780's
rickmcd53

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Posts: 2,494
Reply with quote  #2 
With both batteries combined you would essentially be charging one large battery with two engine charging systems. I think the voltage regulator on each engine would equally share the charge load with no problems. Quite often we have dead batteries on customers boats so we charge them at 50 amps for a short time and the crank the engines with the charger still on.
PhilH12

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Reply with quote  #3 
++ to Rick!  Good advice from a Pro.

Meanwhile, I'd look at a bit different setup myself.  Try to isolate a battery that's running the anchor winch when using it - aka Deep Cycle "House" battery.  Then you're not draining both batteries at the same time.  As Rick states, both engines should help to charge it/them back.

Starting batteries are different from Deep Cycle, and may not like to be running an anchor winch very much.

Purely "thoughts from Under the Shade Tree" though.  [wink]

Phil

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bunkergroup

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Posts: 315
Reply with quote  #4 
The company claims that the 780 is a semi cycling battery (100ah) . I dont know the difference in construction between deep and starting batteries only that a deep cycle handles more draw downs before they are kaput. I'll report back how my existing batteries handle the winch.
Cheers
PhilH12

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Reply with quote  #5 
Anchor up shouldn't be too bad unless you do it often, without re-charging (running) in between for a while.

I've often wondered at the battery difference myself, and I don't know "why it is", or "what's different".  [wink]

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Hydrasports2150

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Posts: 213
Reply with quote  #6 
PhilH12: (I've often wondered at the battery difference myself, and I don't know "why it is", or "what's different".)


Discharging batteries causes sulfation which is the process of having sulfur form on the lead plates inside the battery. Sulfation degrades the plates, reduces the amount of surface area on the plate, and ultimately reduces the amount of chemical interaction between the plates and the electrolyte. End result is reduction in the amount of electricity a battery can produce and store. Deep cycle batteries have thick plates and can be discharged down to 80 percent (deep cycled) time after time without causing damage. In contrast, starter batteries have thinner but more numerous lead plates which increases surface area with the chemical electrolyte, this means they can deliver short high-current bursts to crank an engine, meaning they frequently discharge only a small part of their capacity. The main difference between true deep cycle batteries and other types is that deep cycle batteries have fewer but more solid lead plates which resist damage from discharge as opposed to the thinner more porous plates in starting batteries which can be damaged by frequent deep discharging
jimh

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Posts: 6,393
Reply with quote  #7 
Exactly how the EMM of an Evinrude E-TEC will react to being connected to a battery that is being charged by another charging current source is unknown to me. Considering the cost of a new EMM, I have no interest in experimenting to find out.
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boatinpete

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Posts: 7
Reply with quote  #8 
So if one owns a bassboat you can't run electronics off of the starting batteries as almost every bass guy does ?
rickmcd53

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Posts: 2,494
Reply with quote  #9 
The previous discussions we're about trying to charge a battery for an anchor windlass.
There are no problems with running normal boat loads/electronics off of the starting battery.
Having a second starting battery adds an extra level of protection but many boats do not have space for one.
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