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Old 01-10-2017, 06:58 AM   #1
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Default Dual Bank Battery Selector Switch?

Hey guys,

Looking for a battery selector switch for an upcoming boat electronics project.

Most dual battery bank switches that i see comes in this variant:

1) 4 way - OFF, BATT 1 ON, BATT 2 ON, BATT 1 + 2 (combined 1 and 2 in parallel)

I was hoping for one with 5 way system, OFF, BATT 1 ON, BATT 2 ON, BATT 1+2 (parallel), BATT 1&2 ON (non-parallel).

This would allow be to have both batteries ON but not in parallel, and both batteries ON but in parallel (emergency situation whereby engine battery is low).

Isn't there something like this one the market? Or is there a better way to do it.

Thanks!

Last edited by snsd555; 01-10-2017 at 07:25 AM.
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Old 01-10-2017, 07:36 AM   #2
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Why won't you go instead in a BlueSeaSystems Switch and Relay:
https://www.bluesea.com/products/7650/Add-A-Battery_Kit_-_120A

I have one and love it.
Its just On and Off (and 1+2 if you realy need it)
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Old 01-10-2017, 09:19 AM   #3
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Hey Jorinho,

That seems to work well. However i'd like the option to turn off/kill the engine battery while at anchor but leave the house battery on to make sure it doesn't deplete.

Otherwise, this is a great option!
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Old 01-10-2017, 01:48 PM   #4
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Originally Posted by snsd555 View Post
Hey Jorinho,

That seems to work well. However i'd like the option to turn off/kill the engine battery while at anchor but leave the house battery on to make sure it doesn't deplete.

Otherwise, this is a great option!
While the add-a-battery kit doesn't allow you to turn off the engine battery it WILL automatically separate the house battery so that if you run down the house battery you can still start the engine...
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Old 01-10-2017, 06:50 PM   #5
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This close but no option to turn 2 on alone. http://www.marinco.com/en/772-dbc
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Old 01-10-2017, 07:06 PM   #6
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This close but no option to turn 2 on alone. http://www.marinco.com/en/772-dbc
Perfect! Just what i was looking for. I can leave battery 1 as the house battery as that should be always on.

Thanks again!!
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Old 01-11-2017, 04:28 AM   #7
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The BlueSeaSystems Kit assures you allways have your starting battery charged.

Basically if you start uour engine and your starting battery goes above 13.6v for 30s, the relay will start charging your house battery.

After you power off your engine the relay will still charge your house battery till the starting battery drops to 12,75v. If that happens, the relay will separate the batteries so you will allways have enough power in your starting battery.

If the relay detects one of your batteries has a very low voltage, it also will warn you that your battery is dead, avoiding it to connect both and risking to kill the other one also.

As i sayd, its just ON and OFF and the relay will do the management itself.
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Old 01-11-2017, 04:30 PM   #8
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Marinco do voltage sensitive relays as well, although I haven't seen one in the Pro Installer range yet.

If you want a charging relay Marinco do battery management clusters under the BEP brand. Their switches and relays are connect electrically and physically with solid link bars whihc make for very tidty and compact installation. You can buy by preconfigured packages or build your own to suit from separate switches and relays. http://www.marinco.com/en/products/battery-management
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Old 01-11-2017, 06:27 PM   #9
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Is it bad to run with 1+2 all the time? I turn my switch to both and run all day.
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Old 01-12-2017, 01:32 AM   #10
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Is it bad to run with 1+2 all the time? I turn my switch to both and run all day.
There's nothing "bad" about it as such but if you stop running the engine (for example at the local sand bar or to drop the hook and do some fishing) you're running the risk of depleting your starting battery... With the likes of the add-a-battery kits combining (for charging) and disconnecting (to avoid depleting both batteries) is handled automatically...
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Old 01-12-2017, 01:41 AM   #11
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This is the one you want. Ive been running it on my boat for the past 6 years and it has been spot on.

Does everything you listed.

http://www.marinco.com/en/716-sq-140a-dvsr
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Old 01-12-2017, 01:44 AM   #12
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Is it bad to run with 1+2 all the time? I turn my switch to both and run all day.
And combining can be bad if you have one of your batteries dead in that case it can kill or degrade the good one (reducing it expected life time).
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Old 01-12-2017, 08:37 AM   #13
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Originally Posted by Jorinho View Post
The BlueSeaSystems Kit assures you allways have your starting battery charged.

Basically if you start uour engine and your starting battery goes above 13.6v for 30s, the relay will start charging your house battery.

After you power off your engine the relay will still charge your house battery till the starting battery drops to 12,75v. If that happens, the relay will separate the batteries so you will allways have enough power in your starting battery.

If the relay detects one of your batteries has a very low voltage, it also will warn you that your battery is dead, avoiding it to connect both and risking to kill the other one also.

As i sayd, its just ON and OFF and the relay will do the management itself.
I have a question for the group. Can you still have an onboard battery charger also hooked up for when it is plugged in to AC at the dock and use the BlueSeaSystem?

I already have a ProTournament 100 Charger on my boat, but really would like the security of the BlueSeaSystem for maintaining the batteries under way. I had a bad battery this summer and didn't realize it until after the season when I put it on the charger. I would have hated to deplete one of the two batteries accidentally at sea and not have had that second battery working.
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Old 01-12-2017, 10:37 AM   #14
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I have a question for the group. Can you still have an onboard battery charger also hooked up for when it is plugged in to AC at the dock and use the BlueSeaSystem?

I already have a ProTournament 100 Charger on my boat, but really would like the security of the BlueSeaSystem for maintaining the batteries under way. I had a bad battery this summer and didn't realize it until after the season when I put it on the charger. I would have hated to deplete one of the two batteries accidentally at sea and not have had that second battery working.
Absolutely!... And if you have a 2 bank charger you can even set the switch to off... Each battery will get it's own charge (i.e. no need to go through the VSR)...
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Old 01-13-2017, 10:57 PM   #15
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sorry if this is a newbie question but it is ok to add a third battery for electronics , connects parallel to the house battery and till using the Blue Sea System separating two house batteries from the starting battery ? basically adding another battery to the house battery side.
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Old 01-14-2017, 01:47 AM   #16
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sorry if this is a newbie question but it is ok to add a third battery for electronics , connects parallel to the house battery and till using the Blue Sea System separating two house batteries from the starting battery ? basically adding another battery to the house battery side.
Yes, that's not only doable but is actually done quite often... When you have more then one battery connected to each other it's called a bank of batteries... Sometimes they will be connected in series (basically you're creating a single battery with the combined voltage)... You'll often see two 12 volt batteries connected in series to make up a 24 volt bank... Or, you'll see three 12 volt batteries connected in series to make up a 36 volt bank... More often then not you'll see this arrangement on smaller boats powering trolling motors...

Otherwise, as you'll want to do, you'll connect two (or more) batteries in parallel to make up a 12 volt bank with a larger capacity... In your case the VSR part will "see" the two paralleled batteries as a single 12 volt "battery"...

The thing with banks (whether connected in serial or in parallel) is that it is advisable to have all batteries in the bank as possible... Same capacity, same size and, preferably, same make model and age...

Series connection means the positive pole of one battery is connected to the negative pole of the other... When you measure the voltage over the two free poles you'll see that the voltage has accumulated... Parallel connection means the positive pole of one battery is connected to the positive pole of the other and the negative pole of one battery is connected to the negative pole of the other... When you measure the voltage over the poles you'll see that the voltage has stayed the same but the capacity has accumulated...

Depending on the application you might even see something like two 6 volt batteries connected in series which will be connected to an identical pair in parallel creating a 12 volt large capacity bank... As for as the VSR (or a charger) is concerned, the bank is "seen" as a single 12 volt battery...
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Old 01-14-2017, 08:26 AM   #17
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Heck, I connected my house & engine batteries together for one giant bank that consists of 4 each 230AH golf carts (2 each in series for 12v). I never worry about the engines with my generator there to start the engines if the bank ever became discharged. And that is almost impossible to happen with my solar that charges almost 25 amperes until the batteries are replenished or the sun goes down. And I monitor my battery banks with a hydrometer.
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Old 01-14-2017, 09:52 AM   #18
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Heck, I connected my house & engine batteries together for one giant bank that consists of 4 each 230AH golf carts (2 each in series for 12v).
If your double banks aren't separated by switches etc you really don't really have house & engine batteries as such... You just have one big bank... IOW, one big battery...

To each their own but you already have most of a house & engine batteries system there... If I were you I'd go for the full monty... It makes sense... As you'll discover that one day where you'll find yourself unable to start your engine because something ate all your stored battery power...
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Old 01-14-2017, 10:07 AM   #19
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I keep coming back to this thread but I am still confused. Navatech is there a reasonable solution for the following set-up. 1 starting/house battery, 2 12v series for 24v trolling motor boat is not used alot. I have a nice Minn-Kota 2 bank charger. right now it is hooked up to each trolling motor battery and use a trickle charger on the starting/house battery. Several times i have discharged the house/starting battery on the water while running a bait tank and depthfinder and had to move cables from a trolling motor battery to start back up. The boat sits on the trailer more than the water so charging from the engine is more about just replenishing in brief spurts
Would the add-a-battery kit plus one more ACR allow me to charge 2 batteries from 1 bank and 1 from the other. I would like to have the option to change batteries for starting and only have to maintain the 1 2 bank charger.
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Old 01-14-2017, 10:20 AM   #20
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I keep coming back to this thread but I am still confused. Navatech is there a reasonable solution for the following set-up. 1 starting/house battery, 2 12v series for 24v trolling motor boat is not used alot. I have a nice Minn-Kota 2 bank charger. right now it is hooked up to each trolling motor battery and use a trickle charger on the starting/house battery. Several times i have discharged the house/starting battery on the water while running a bait tank and depthfinder and had to move cables from a trolling motor battery to start back up. The boat sits on the trailer more than the water so charging from the engine is more about just replenishing in brief spurts
Would the add-a-battery kit plus one more ACR allow me to charge 2 batteries from 1 bank and 1 from the other. I would like to have the option to change batteries for starting and only have to maintain the 1 2 bank charger.
The fly in the ointment in your case is the dual voltage thing... You have 12 & 24 volts on board... Sure, the 24 volt bank is made up out of two 12 volt batteries but those batteries are connected to each other in parallel... Connecting 12 volts charging to each of them separately might be possible but I have never done it and I haven't seen it done...

A better option for you would be to find somebody who's done it successfully... Or, discuss it with Blue Seas Systems tech support...
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