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Author Topic:   Wiring Bait Tank Pumps
irishcreamer posted 05-12-2009 01:47 AM ET (US)   Profile for irishcreamer   Send Email to irishcreamer  
I have a [Boston Whaler OUTRAGE 18] with 150HP Optimax. Will soon be rewiring the boat. Would it be okay to wire the bait tank to the house battery or would I need a third, dedicated battery? Many thanks!
jimh posted 05-15-2009 01:18 AM ET (US)     Profile for jimh  Send Email to jimh     
Yes, it is a good idea to isolate any loads like a pump from the starting battery. If you have a two-battery system with starting battery and house battery, the pumps should be run from the house battery. In this way they will not discharge the starting battery.

If the pumps are going to run their battery down to absolutely dead charge, you might want a third battery for them so that you don't kill the house battery. If the house battery goes flat, you won't have your house accessories, like a VHF Marine Band radio, instruments, GPS receiver, and so on. But with some battery management, you can share the house battery with the pumps. You should have an arrangement where the engine, if running, is charging the house battery via an ACR or VSR.

Dick E posted 05-15-2009 03:42 PM ET (US)     Profile for Dick E  Send Email to Dick E     
How many amps will your bait tank pump draw? For example a rule 500-gal/hr pump uses less than 2 amps. That’s hardly any draw.
Will you be leaving your bait tank running overnight, or just when going out to fish? If the later my opinion two batteries will be fine.
I have starting battery for the engine, GPS/fish finder and marine VHF.
My trolling motor and bait tank uses a deep cycle. I recharge the deep cycle after trolling with a portable charger, as I do not make long trips from my dock to catch fish.
This setup works great for me.
irishcreamer posted 05-15-2009 10:24 PM ET (US)     Profile for irishcreamer  Send Email to irishcreamer     
Thanks, guys.

I am planning to have a 2 battery system using some isolator / ACR type system where both batteries are starter batteries (not deep cycle) and one battery is dedicated to the primary engine for current draw but the engine charges both batteries. The main point I am investigating here is whether it is appropriate to use a house battery of the starter type to power the bait pump.

Thanks for the feedback. From what I hear this is appropriate my usage which will be while out fishing but not for overnight pumping.


Irish Hooker posted 05-16-2009 12:21 AM ET (US)     Profile for Irish Hooker  Send Email to Irish Hooker     
I have a dedicated bait tank battery. I like redundancy though.
I think it also depends on what type of fishing you do. If I'm going offshore, and plan on trolling for hours I would have no problem with my bait pump hooked to my starting battery. If I do a lot of stops (fishing structure) and a lot of short runs, I would want to have a dedicated battery. Just my two cents.
jimh posted 05-16-2009 08:57 AM ET (US)     Profile for jimh  Send Email to jimh     
Will your engine be running while the pumps are running?

This is the key to selecting the battery type to be dedicated to the pumps. Starting batteries like to remain at full charge. They are designed to deliver a brief surge of current, then to be charged and floated back to full charge. If you plan to use the pumps so they will be continually pulling their battery down to a discharged state, it will be better to run them from a battery that is designed for many charge-discharge cycles.

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