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Bait pump off of one 36 volt configuration

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Bait pump off of one 36 volt configuration

Old 03-10-2019, 02:04 PM
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Default Bait pump off of one 36 volt configuration

Good Day,
I am new to this forum and have a question about a 36 volt trolling motor battery configuration. I fish the coast of NC and run a bait pump all day long without the outboard on most of the time. Due to the pump being wired to the cranking battery it would drain the battery, so I added a trolling motor and rewired the bait pump to the trolling motor battery, problem solved and can run the pump all day. Nothing else runs off the bait pump trolling motor battery.

So, we have a boat ordered that will have a 36 volt trolling motor. Is it possible to have a bait pump wired to one of the 3 trolling motor batteries? we usually only run the trolling motor in the morning just to catch bait, so there should be plenty of power for the bait tank. I am trying to avoid having a 4th trolling motor battery.

Thank you

Jim
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Old 03-10-2019, 06:09 PM
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Yes you can. Use the batt “lowest” in the string so it really is 12v with respect to any other ground point.

Since this is for a new boat, perhaps a wire cld be run from the house batt?
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Old 03-10-2019, 06:44 PM
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There are also step down convertors that will turn 36 volts to 12volts. Just make sure you get one with enough watts to cover your pumps demand.
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Old 03-10-2019, 08:37 PM
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Name:  12-24-36Diagram_zpskrct0rsu.png.3e06a450f497a988cadbd2bb0eb5ee8c.png
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Old 03-11-2019, 05:49 PM
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Thank you for the replies. So in the above diagram posted by catch232 battery 1 could run a bait pump? Regarding the converter from 36 to 12 volts, I have searched for a marine application and could not find one. Any suggestions on a converter?

Thank you

Jim
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Old 03-11-2019, 06:04 PM
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You dont need a converter. You already have 12v.
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Old 03-12-2019, 12:16 AM
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That is not the proper way. Yiu will destroy the first battery over time. Use the 36v converter and draw from all 3 equally.

Or out in a house battery.

What dies your gps, lights etc run off?
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Old 03-12-2019, 04:03 AM
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I will try to find a marine converter 36v to 12v. The factory will wire all accessories to a cranking and will have a guest as a back up which will include 2 pumps. one for the bait tank that will run all day with the outboard off most of the time. The other will be a live well which may run all day depending on how well we fish.
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Old 03-12-2019, 01:06 PM
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Originally Posted by smac999 View Post
That is not the proper way. Yiu will destroy the first battery over time. Use the 36v converter and draw from all 3 equally.

Or out in a house battery.

What dies your gps, lights etc run off?
Quite funny really. OP might want to consult w/ a marine electrician in-person.

Not uncommon to do this on small boats with the start batt combined with a house batt to generate 24v for a TM. Not the best to use the start batt for that for obvious reasons unrelated to the "destroy the battery over time" offering above.
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Old 03-12-2019, 01:09 PM
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Originally Posted by badmonkeylures View Post
I will try to find a marine converter 36v to 12v. The factory will wire all accessories to a cranking and will have a guest as a back up which will include 2 pumps. one for the bait tank that will run all day with the outboard off most of the time. The other will be a live well which may run all day depending on how well we fish.
Not clear what you are saying... guest/cranking? If you are having the boat built, why not have the wiring added so all pumps can operate off the house batt rather than tap off the TM batts or, haha, convert 36 to 12?
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Old 03-12-2019, 03:58 PM
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Originally Posted by NEBassMan View Post
Not clear what you are saying... guest/cranking? If you are having the boat built, why not have the wiring added so all pumps can operate off the house batt rather than tap off the TM batts or, haha, convert 36 to 12?
So, we anchor almost all day without the outboard on for only very brief periods. In the past when the bait pump was wired to the cranking battery it would drain the battery to the point we had to jump start. I re wired the bait tank to a separate trolling motor battery, which completely solved the issue. This new boat will have a cranking and guest battery with a bait pump and a live well wired to both through the use of a 2 way battery switch. Actually all accessories including the outboard will work through the 2 way battery switch on either cranking or house . Additionally there will be 3 trolling motor batteries. Maybe the pumps can run all day off of a cranking and when the cranking gets drained switch to the guest and hope for the best? Now, if we are fortunate enough to catch a nice fish early in the day suitable to keep alive in the live well, not bait tank, certainly 2 pumps drawing on the cranking will expedite drainage. In order to the additional weight of a 6th battery, which would have been just for the bait pump, I was trying to figure a way to use the 3 trolling motor batteries, which are usually only used for a few minutes as long as catching bait goes well. Thank you for the replies. Looks like the best option is to find a converter 36v to 12v. Will try to find a marine one.
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Old 03-12-2019, 05:58 PM
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Originally Posted by smac999 View Post
That is not the proper way. Yiu will destroy the first battery over time. Use the 36v converter and draw from all 3 equally.

Or out in a house battery.

What dies your gps, lights etc run off?
I have heard this as well and is why I suggested the convertor. Apparently it can cause the draw to not be uniform and burn the hijacked battery out. Yes it will work but the question is how long. Also OP they do make a 32 volt bait well pump. I have them on my Hatteras. It might handle 36 volts without issue as mine pushes 36-38 volts when generator and/or engines are charging the batteries.
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Old 03-12-2019, 07:23 PM
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Have it your way. Post up the marine converter you find. You might consider not using your start batt if you are needing to jump after using it for a bait pump.

Note to self: spend time elsewhere.
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Old 03-12-2019, 07:54 PM
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https://dcpoweronboard.com/dc-converters-landing/

I have one of the 32-50V ones that converts to 24 volt for a radar I did away with. I may be putting up for sale soon since my new radar is 12 volt
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Old 03-13-2019, 12:32 PM
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Sounds like you will already have a cranking and house battery that is manually switched. You should have all of your accessories, pumps, etc hooked up to the house battery (guest) and will want to isolate your starting battery so that it is only used for starting the motor. That way you don't run into the problem you had before having to jump start it. There are lots of different systems for this, both manual and automatic that allow for isolation and still allow for charging the batteries.

As an aside if you do want to use the trolling motor batteries for the "house" purpose you can do so and eliminated the other battery. In fact, as mentioned a lot of people use the starting battery for one of the two or three batteries in a trolling motor setup. This is one of the configurations Yandina supports, for example, with their trollbridge system (https://www.yandina.com/troll36info.htm), see schematic "A". The recommendation (not mine, this is from Yandina) is that if you want to do this you should have a higher (AH) capacity battery as the bottom battery in the group. I'm planning to use Lithium to run both my Rhodan and house needs (stereo, electronics, etc). The bottom battery will be twice the AH as the others.

Yes, you could also use a converter but you already have 12V.
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