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Electronics & Battery Question
#11760186
08/05/16 04:12 PM
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Joined: Jul 2016
Posts: 68
TSBobcat
OP
Outdoorsman
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OP
Outdoorsman
Joined: Jul 2016
Posts: 68 |
I have 2 questions regarding my Lowrance HDS7's...
1) Should i unplug the power cable from the unit when charging the batteries on a 3 bank charger
2) I have 2 batteries wired together to power a 24V trolling motor. I want to power the front Lowrance unit off of one of those batteries. Do I only hook up to a single battery's terminals, or sense the the two batteries are wired together do I need to split between the 2 batteries like i did for the trolling motor?
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11760222
08/05/16 04:39 PM
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Joined: Dec 2012
Posts: 6,687
44 Diesel
TFF Celebrity
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TFF Celebrity
Joined: Dec 2012
Posts: 6,687 |
I leave mine unplugged cause the power around my area goes out and comes back on real quick and I don't won't to risk a power surge on my expensive computers. I would not recommend wiring graphs to trolling motor batteries as they would greatly increase the possibility of interference (RFI).
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11760325
08/05/16 05:52 PM
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Joined: Dec 2006
Posts: 3,292
Dayne
TFF Team Angler
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TFF Team Angler
Joined: Dec 2006
Posts: 3,292 |
Don't use the trolling motor battery for sonar units. BTW If you were to wire it like the tmotor you would fry your sonar as that is 24volts.
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11760463
08/05/16 07:19 PM
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Joined: Jul 2016
Posts: 68
TSBobcat
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Posts: 68 |
Sounds good. I'll wire it to the crank battery instead. Now out of curiosity, if you have 2 batteries wired like this, and you attached a unit that requires 12V to the feeds on the bottom battery only, will you be getting 12V or 24V?
Last edited by TSBobcat; 08/05/16 07:19 PM.
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11760519
08/05/16 07:55 PM
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Joined: Nov 2010
Posts: 5,101
Wayne P.
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Posts: 5,101 |
Sounds good. I'll wire it to the crank battery instead. Now out of curiosity, if you have 2 batteries wired like this, and you attached a unit that requires 12V to the feeds on the bottom battery only, will you be getting 12V or 24V? You would get 12 hooked directly to either battery. A circuit is between the two connections. No different that connecting a multi-bank charger to batteries in series.
Helix 12 CHIRP MEGA SI+ GPS G3N and G4N, 1198c SI, SOLIX 10 SI G3, Helix 8 MEGA SI+ GPS G4N, SOLIX 12 SI and G3, MEGA 360, MEGA LIVE TL, RC-1
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11760558
08/05/16 08:23 PM
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Joined: Jul 2016
Posts: 68
TSBobcat
OP
Outdoorsman
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OP
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Posts: 68 |
That's what I thought since that's how my multi-bank is hooked up like you mentioned. Appreciate the help everyone
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11776616
08/14/16 08:20 PM
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Joined: Mar 2004
Posts: 8,101
fastguy�
TFF Celebrity
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TFF Celebrity
Joined: Mar 2004
Posts: 8,101 |
How long could you expect a depth finder to run if connected to a single battery as shown in the illustration?
It ain't easy making it look easy.
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Re: Electronics & Battery Question
[Re: fastguy�]
#11777152
08/15/16 01:40 AM
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Joined: Jul 2014
Posts: 4,340
Bobby Milam
TFF Team Angler
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Posts: 4,340 |
How long could you expect a depth finder to run if connected to a single battery as shown in the illustration? You wouldn't want it connected like that as you'll get interference from the trolling motor. In the illustration, you are getting 24v but the same capacity so it would depend on how much the trolling motor was used. In overly simplified terms, think of just having a 12v trolling motor running off of one battery and then adding a FF to it would sort of answer your question. In reality the 24v trolling motor would be more efficient but you can see what I am saying. If the batteries were connected in parallel, you'd be getting 12v but would double their capacity or amp hours. My cranking battery can't handle running lights at night for several hours and still have enough power to crank the motor. I plan on adding another battery in parallel to it or just put all of my lights and electronics on the extra battery as a stand alone.
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Re: Electronics & Battery Question
[Re: TSBobcat]
#11777561
08/15/16 11:54 AM
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Joined: Jul 2012
Posts: 12,214
Cast
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TFF Guru
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Posts: 12,214 |
It seems strange to me that high end electronics provide no DC input filtering for sharing TM battery pack. You could add a inductor filter at input to each device maybe. We had to do that in the sixty's to keep noise out of our new car tape decks.
Cast I have a short attention spa
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Re: Electronics & Battery Question
[Re: Cast]
#11777943
08/15/16 02:53 PM
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Joined: Oct 2005
Posts: 1,711
Lou r Pitcher
Extreme Angler
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Extreme Angler
Joined: Oct 2005
Posts: 1,711 |
It seems strange to me that high end electronics provide no DC input filtering for sharing TM battery pack. You could add a inductor filter at input to each device maybe. We had to do that in the sixty's to keep noise out of our new car tape decks. Sonars actually provide intensive RFI filtering on their power inputs. But compared with amplifying a minute echo from a small object dozens of feet below the boat compared with spikes from a trolling motor, electrical isolation in the wiring is usually needed. If you still are going to use a trolling motor battery for sonar power, only use the most negative battery as using the battery connected to the TM positive would with the water being a conductor would introduce a path for damaging electrolysis between the trolling motor skeg and the boat motor lower unit.
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