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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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  #1  
Old 05-07-2010
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2,12's, 2,6's TOO $$$!

is what My battery banks are.. time to replace. Do I go with 2- 6 volt trojans or just 2 6 volt marine type for the house, and one 12 volt for starting? Seems silly to have so many batteries on on one boat. But they were there when I bought her.
Most 30ft boats seem to have only 2, 12 volt batteries some are running refrigeration too. I'm not.
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Old 05-07-2010
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Denise,

If you're not running refrigeration, then two 6-volt golf cart batteries (Trojan or other) should be able to handle your house bank needs nicely. This would give you 225AH total capacity, or about half that in usable capacity.

The decision as to how much capacity is needed depends on a number of factors, not just the length of your boat. How you use them (at the dock most of the time, on a mooring, actively cruising, etc.) is an important consideration. So, too, is the daily consumption. It's best to make up an energy budget, listing all the items aboard which run off of 12-volt power, and estimate the total daily usage. Only after you've done this can you know whether 225AH capacity is enough.

A separate starting battery is a good idea. It can be set up to be recharged automatically with an EchoCharge or DuoCharge device.

What means do you have to recharge the house batteries?

Bill
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Old 05-07-2010
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I've an on board charger, that does well when I use it. 2, 5 watt panels keep things topped up nicely (they have diodes) alt, is 70 amp I think. 2 cyl universal diesel.
I may someday get a compressor for the box cooler but all I use is lighting, (no leds yet! running lights, radio, gps, depth finder, etc. There is an inverter but I've never used it.

Oh I would like to be able to stay on the hook more then one night.
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Old 05-07-2010
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If you are going to replace them anyway, keep it simple.
I'd go with Deep Cycle AGM's - pick your brand - and get three, 2 for house and 1 for start.
I use 3 Optima spiral's as house and one for start.

I say AGM's because they need no maintenance, and missed or improper maintenance is the cause of death for most batteries, improper charging being the other reason. I do enough maintenance on the boat as is, and I got tired of acid eaten shirts and jeans.

Switching from wet cell to AGM means you have to make sure your charger can be set up for AGM's, most take a higher charge voltage.
Once you've done it, you'll not go back.
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Denise,

I'm converting from 2 group 31, 12 volt batteries to 4 6v GC batteries. My boat has refrigeration so I need more AH's even for weekend cruising. I shopped batteries in my area and decided to go for Energizers from Sam's Club for $75 each. Even with the cost of joining Sam's, that is less than 1/2 the cost of even the lower end Trojan 605's which are rated for 1/2 the recharge cycles of the premium T105's in my area.

If I get 3 years satisfactory use out of these, I'll consider myself ahead of the game and if they make it 5 years as my group 31's did, I'll be happy indeed.

The Sams Club batteries get mixed reviews from the carting crowd, but I figure I will not be discharging them as fast or as deep as a cart would so time will tell for my use.
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I'm feeling dizzy guys...
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Old 05-07-2010
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Ok... so.. buy by AH rating, then price... if I'm reading all this right?

AGMs... $$$

trojan - great for the $

(ducking) someone told me sams/walmart marine batteries are great, have high AH ratings too.

I do have 4 boxes foamed in place under the coffin bunk, the cables are all routed above the foam. These things have never moved an inch! Plus the foam did not stick to boxes so they can be lifted out. (strap is secure to the new plywood under them.
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Old 05-07-2010
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Quote:
Originally Posted by chucklesR View Post
If you are going to replace them anyway, keep it simple.
I'd go with Deep Cycle AGM's - pick your brand - and get three, 2 for house and 1 for start.
I use 3 Optima spiral's as house and one for start.
Chuck - which Optima's do you have (blue, red yellow top)? AH rating? We will probably be upgrading once I get the fridge installed in the next couple weeks. Also, where did you buy them?

Denise - sorry for the slight detour.
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My boat came with 90ah wet cells, 2 of them. I upgraded to the blue top Optima AGM's with 75 ah because I wanted a) more AH, b) AGM.
That gives me 210 ah, I use 40 - 50 a day, the solar puts back 30 - 40. I have lots of hang time on the hook before I have to worry (5-7 days).

I like them, the maker says they are more tolerant of overcharge/overvoltage because of the spiral design. AGM's suffer if they are hit with too much voltage; these can take 14.6v; I have the charge set to 14.3 max.

I got them, and the installation of them (and a host of other stuff) from PKYS - a local yacht service provider recommended by PCI, the boats builder. He's the only one authorized to work on the boat at PCI's dock, so I was somewhat constrained in choice.
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Old 05-07-2010
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to add to the mix.... Friends are encouraging me to get rid of the "big switch" and get a combiner...one that doesn't "bleed"

Now, my head is really spinning!

I can look at and read the electric diagrams on huge ac units with power up to 480 volts 3 phase, yet all this DC stuff makes me nuts!
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