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  #1  
Old 03-03-2016, 06:29 AM
jebadiah04 jebadiah04 is offline
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Dual battery set up. What kind of isolator?

Hopefully some of you electric genius dudes can help me out here.

This is in my boat.

Currently I run a dual battery set up in my boat. 1 starts the motor the other runs all my stuff. However the 2nd battery I always either charge it at night. (Pain in the BUTT because of its stowage location) or during the day I run my solar panel on it and it charges it up faster than my fish finder can use it...but the downriggers eat it up...

So I want to put in an isolator unit that charges both Batts when the engine is running and isolates them when the engine is off. So far I have found 2 different types.

One system uses large diodes and heat sinks to perform this task. Seems like it's the simplest way to make it work. However I would have to believe that if it's using a giant heat sink, it's creating heat, which is taking away from my battery charging...not good since I don't use the "big motor" that much in the boat.

The other system I've been looking into uses a relay system which I'm assuming is basically 2 celenoids wrapped into 1 package. With ignition power it flips on and charges both batts. Seems like a good system since less draw on the amps.

Does anybody know which is better?

Here's one I'm thinking about
https://www.amazon.com/gp/aw/d/B0031...=ATVPDKIKX0DER


Here's the other
https://www.amazon.com/gp/aw/d/B000R...rch&th=1&psc=1

I'm unsure how the bkue sea system works. I want one that's automatic and I'm not sure if that is or isnt.

Anyone have a recommendation or suggestions?
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Old 03-03-2016, 06:37 AM
jebadiah04 jebadiah04 is offline
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Also kicking this around because I can charge on the trailer. Which is what I'm hoping to avoid doing...but the ability to might be nice. However the cost goes right up there quick.

https://www.bluesea.com/products/765...Plus_Kit_-_65A
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Old 03-03-2016, 06:50 AM
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https://www.amazon.com/gp/aw/cr/B004...7005066&sr=8-3
Here is a fully automatic isolator. It senses charging voltage.
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Old 03-04-2016, 06:58 AM
jebadiah04 jebadiah04 is offline
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Thanks Randy.

Ordered...
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Old 03-04-2016, 06:59 AM
jebadiah04 jebadiah04 is offline
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I would rep you, but can't on my phone...it wigs out.

So +20 invisible rep points bro.
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Old 03-04-2016, 07:31 PM
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That's pretty cool.

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Old 03-21-2016, 05:11 AM
jebadiah04 jebadiah04 is offline
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Installed and works like a champ. Haven't tested with the motor running yet, but through my battery charger on my starting battery since it was a little low. I had fish finder monitoring my battery voltage on the accessory battery. After about 20-30 seconds it kicked over and i went from 11.9 to 13.7. both batteries are now charged.
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Old 03-21-2016, 07:09 AM
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Great to hear it's working like it should for ya.
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