CAP78
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Dual Batteries
Fishing partner has a 16 foot outboard with a 9.9 and a single battery. Is there anyway that we can hook up a second battery that will be charged by the motor and also run the trolling motor if the first battery loses power?
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bulldog1
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RE: Dual Batteries
2010/10/18 13:30:22
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Buy a Perko dual battery switch and wire according to directions. The switch will allow you to run on either of the batteries or both at the same time. You can also turn both batteries off preventing any small drain. Be careful to follow directions or you'll end up with 24 volts 
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Erie Mako
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RE: Dual Batteries
2010/10/18 14:48:02
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I take it that you are trying to create a "cranking battery" and a "house battery" set-up? The simplest method might be to go to an RV dealer and get what is called a "battery isolator"...it will charge both at the same time but won't let one battery drain the other one. Don't count on that 9.9 providing much of a charging current...it might help out some, but I really doubt if it will bring up a deeply discharged trolling battery on a short run. (I don't know the specs. on your engine!) You also might want to check out the stuff that offer at http://stealth1charging.com/
On the internet, EVERYONE is entitled to their opinion!
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Split Shot
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RE: Dual Batteries
2010/10/18 19:35:00
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I was thinking also that the little alternator might not have the ba**s to charge both batteries. But what do I know  I have a perko switch on my boat. I can use one battery and charge that battery by itself or the other by itself. also charge both at same time with switch to (all) meaning both batteries.
My Wife said, if I go fish'n one more time, she'll leave me! God, I'm going to miss her!
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pghmarty
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RE: Dual Batteries
2010/10/18 19:43:57
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A battery isolator will keep both batteries charged and not be able to drain the other.
A switch only works when you remember to use it.
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leadmen
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RE: Dual Batteries
2010/10/19 03:16:55
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use a switch the alt is small and would take a long time to charge the batt even a 55hp works hard to charge a batt volt out put say 1.5 amp maxx on a small 9.9
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bulldog1
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RE: Dual Batteries
2010/10/19 13:51:05
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Brings back memories of my buddy and I fishing Kahle lake (electric only). We would get there and take the battery out of my truck and fish all day, put the battery back in and go. We did have to push start the truck a couple times 
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Bogeyjoker
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RE: Dual Batteries
2010/10/19 15:37:09
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ORIGINAL: leadmen
use a switch the alt is small and would take a long time to charge the batt even a 55hp works hard to charge a batt volt out put say 1.5 amp maxx on a small 9.9
My 9.9 kicker charges at 6 amps
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leadmen
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RE: Dual Batteries
2010/10/19 18:53:16
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carry a genset small one 1300 watt or so just in case hay no polution in the lake and plenty of power
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CAP78
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RE: Dual Batteries
2010/10/20 16:53:04
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Thanks for all the info guys, it has definitely been helpful.
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leadmen
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RE: Dual Batteries
2010/10/21 03:02:00
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the old ele start 9.9 had small alts the new ones have larger alt system and also the hp rateing is different too rember some were rated at prop some were at flywheel this has a real diff rember at prop is where you need it so in theory the 9.9 is a 12 to 15hp alts take power thuss robbing power from a motor to generate ele nothing in life is free not even obummer money
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tigercat
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RE: Dual Batteries
2010/10/27 14:21:13
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I often thought about this.Looks like it could be a good winter project.I have two batteries, one for just the outboard and a deepcycle for the trolling motor,anchor winch,2 fishfinders and all the electronics and lights.I was try to figure what I could take off the deep cycle and put on the starting battery to make the deep cycle last longer.These switches and everything may be the way to go for me.I have a 16 ft. boat with a 25 hp 4 stroke outboard. I'm open to all suggestions.Thanks all!
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RE: Dual Batteries
2010/10/27 15:24:00
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Your trolling motor battery should be only for the trolling motor as it draws the most amperage. All other electronics should be on start battery. Make sure you have a good start battery. A hybrid start/deep cycle would be a good choice.
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tigercat
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RE: Dual Batteries
2010/10/27 16:18:17
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ORIGINAL: Outdoor Adventures
Your trolling motor battery should be only for the trolling motor as it draws the most amperage. All other electronics should be on start battery. Make sure you have a good start battery. A hybrid start/deep cycle would be a good choice.
Now that makes sense!I don't know much about amperage or any kind of electronic or electric set ups.Would those electronics drain the starting battery too much if I don't run the outboard for a couple hours.I don't want to get stranded if the starting motor battery diies on me.
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RE: Dual Batteries
2010/10/28 01:26:07
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That anchor winch might. Others should be fine. Some depth finders have a low voltage alarm on them .If you have one set it for about 10 volts then you will know when you battery has started to drain. Its all going to depend of the size, type, and condition of your start battery.Carry a cheap set of jumper cables with you till you know how long the start battery will hold out. If the voltage drops to low to start, jump off of the trolling battery. If you have no gauges or low voltage alarm on electronics, you could get a hand held Minn Kota battery meter. Just check batteries time to time.
post edited by Outdoor Adventures - 2010/10/28 01:28:21
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tigercat
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RE: Dual Batteries
2010/10/28 08:37:08
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ORIGINAL: Outdoor Adventures
That anchor winch might. Others should be fine. Some depth finders have a low voltage alarm on them .If you have one set it for about 10 volts then you will know when you battery has started to drain. Its all going to depend of the size, type, and condition of your start battery.Carry a cheap set of jumper cables with you till you know how long the start battery will hold out. If the voltage drops to low to start, jump off of the trolling battery. If you have no gauges or low voltage alarm on electronics, you could get a hand held Minn Kota battery meter. Just check batteries time to time.
Thanks! I'll have to checck my depth finders for the setting,and a few times when I used my winch it did shut off the units with a beep.That's why i didn't know how to put what where.I carry a portable power pack with cables but luckily I haven't had to use it yet.
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RE: Dual Batteries
2010/10/28 15:19:51
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Yeah that's a low battery. You usually have enough left to start with when this happens if you don't have a big motor and it starts fairly quick. Remember it all depends on the size ,type ,and condition of your battery as to how it will perform . Good luck. ORIGINAL: tigercat
ORIGINAL: Outdoor Adventures
That anchor winch might. Others should be fine. Some depth finders have a low voltage alarm on them .If you have one set it for about 10 volts then you will know when you battery has started to drain. Its all going to depend of the size, type, and condition of your start battery.Carry a cheap set of jumper cables with you till you know how long the start battery will hold out. If the voltage drops to low to start, jump off of the trolling battery. If you have no gauges or low voltage alarm on electronics, you could get a hand held Minn Kota battery meter. Just check batteries time to time.
Thanks! I'll have to checck my depth finders for the setting,and a few times when I used my winch it did shut off the units with a beep.That's why i didn't know how to put what where.I carry a portable power pack with cables but luckily I haven't had to use it yet.
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pghmarty
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RE: Dual Batteries
2010/10/28 15:31:14
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run depth finder off a waverunner battery their only about $30 and don't weigh much
or use optima batteries my electrical system and electronics worked much better with them
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leadmen
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RE: Dual Batteries
2010/10/29 07:40:52
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i got a 16ft also with duel and run the ele off the deep and the start is all by itself you will get intfere with a mar raido if hooked up to the batt for trool so go off start batt had mine set that way for 12 years and cannot **** of how it works i also have the ele hooked up with a lead 3way switch too power ele off of the start batt not hard to do my big boat is hooked up way different it has 3 batts
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bulldog1
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RE: Dual Batteries
2010/11/02 11:57:20
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I never run the anchor windlass without the motor running, there's a reason they have such big circuit breaker on them... they draw alot of juice...
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