Building a New battery system, need ALOT of help - Page 2 - SailNet Community
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post #11 of 32 Old 05-21-2012
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Re: Building a New battery system, need ALOT of help

For value I would stay with flooded batteries.

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Re: Building a New battery system, need ALOT of help

what about the 6 volt,,, trying to stay close to 300 350$$ mark on batteries
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Re: Building a New battery system, need ALOT of help

Two 6 volt golf carts in series works well. The best values is the Duracell brand at Sam's - they are made by Deka/East Penn and sell for somewhere under $100 each. That will give you 215 to 230 AH depending on which of 2 available you get in a very durable battery.

From a post by Maine Sail on another forum:
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Re: Building a New battery system, need ALOT of help

so two 6 volts 230amh would be 230amh in 12 volt, ot 460???
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Re: Building a New battery system, need ALOT of help

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so two 6 volts 230amh would be 230amh in 12 volt, ot 460???
In series the voltage doubles so two 230 AH batteries @ 6 volts will give you 230 AH @ 12 volts.

If you parallel 2 batteries the AH doubles.

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post #16 of 32 Old 05-21-2012
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Re: Building a New battery system, need ALOT of help

Informative thread with easy to understand information that I can use! Thanks guys.
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post #17 of 32 Old 05-21-2012
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Re: Building a New battery system, need ALOT of help

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For the last 2 years have been reading and trying to figure out what when where and why to do with the batery system. I am more confused now than when i started to read up on it. Last night could not start, batts were dead. So i jumped off from house bank with jumper cables and got it running after a hour or so looking for cables, moving stuff out the way, i was so aggrivated i was ready to throw the hole boat over board!!!!!

Here are a few questions that i would like to start with, I know I have asked in the past, but was more opt to do what i wanted, and take the cheap route out,,, but after last night, I WANT IT DONE RIGHT!!!!!!

What i have, and will keep....
Interstate deep cycle Starter battery,,, less than a year old. \
70 amp alternator

What i have and would like to use if i can as house bank
agm battery, not sure of the age, or size, but less say 4 yrs old.
auto zone cheap battery, same age?

The house bank is mid ship under table, the starter battery in engine compartment about 12 feet from house bank, and two feet from motor.

With all that said,,, Please help me get started.

1. Do i need to keep the house bank and starter bank totaly seperate,,, I was told that some of the electronics are sensitive to amp drop during start?? I also read that you could use an echo charger that would split the alt. to send most of the juice to house bank, and some to starter bank... But would this cause the electronics{gps, radios, auto pilots, wind gages etc} to act up or get fried when you start the motor.

2. Is using two mixed matched batteries as house bank a bad idea????
Do i add one new agm to an older agm, or would two new batteries be better??

3. The start battery is wet, Can the house battery be agm, or should they match. I was told you cant charge different style batteries with same charger. What i do now is the alt is only hooked up to starter battery, and a two amp trickle charger to two miss matched house battiers.

4. If i use an echo charger, does the new battery charger still see two banks, or just one.

5. Does the alternator and echo charger both hook to to echo charger, or do I need to hook up alternator to echo, and shore power charger be a two bank system?

Most of my sailing is just a couple of hours,, but gearring up for more. I do have a budget, but this hosh posh stuff i am doing now is killing me...
Thanks for any and all input,,,,
How are you planning to use the boat? Just weekend sailing or cruising?

Brian

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Re: Building a New battery system, need ALOT of help

Mostly local sailing a few over night trips.
Would love to sail across the gulf of Mexico
One day.
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post #19 of 32 Old 05-21-2012
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Re: Building a New battery system, need ALOT of help

There's been a lot of great advice here. I personally would offer the following:

The AGM's and wets will charge at different rates. You need to pick one or the other. For your use, I probably would not use agm's. I would get a decent quality wet cell which will be cheaper and for that use, just as reliable. If you already have agm's that are the newest, pair up with that, otherwise focus on the wets.

I assume you have a 1/2/ALL/OFF switch? If not, that would be my investment over anything else. You can wire all your house into 1, start into 2, etc. The way most sailors I know use this system is they keep it on all when under way under motor, put it on house bank (1 in your case) when sailing, and generally use the ALL for starting. You just have to be mindfull to switch the switch depending on what you are doing. Forgetting and leaving it on ALL will of course tax all your batteries. Once you get used to it, it is easy.

Make sure you have a good 3 stage charger to keep your batteris fresh when plugged in.

Outside of that, I probably would not invest a lot of money into a brilliant system. You are not cruising. Wait until you go cruising for battery monitors, echo chargers, top of the end batteris, or any major changes. Also, if you can get your start battery out of the engine cowling and keep it cooler, that will help it. They don't like to get real hot.

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post #20 of 32 Old 05-21-2012
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Re: Building a New battery system, need ALOT of help

Oh, and don't forget you cannot change teh battery selector when the motor is running. Just in case you didn't know.

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