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Old 10-09-2016, 05:02   #31
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Re: Right batteries for cruising

Quote:
Originally Posted by StuM View Post
I presume that you meant Amp hours, not cranking Amps.

But who knows? Please use the correct units when discussing electrical systems here.

You never give up trying to educate the readers about the difference between Ah and CCA ?

How is your popcorn box doing?
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Old 10-09-2016, 05:05   #32
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Re: Right batteries for cruising

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Originally Posted by ranger42c View Post
A thought about how to answer battery questions:

Seems like useful to start with a series of questions:
[...]
- And so forth.

The "right" answer would perhaps arise from that kind of analysis.

-Chris

Very good points!
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Old 10-09-2016, 05:09   #33
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Re: Right batteries for cruising

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Originally Posted by S/V Alchemy View Post

The Li-Ons are great (particularly for a race boat) but are they rugged enough to go to sea? Are they worth the higher cost per Ah over time? Dunno. I do know I had a Li-On battery in a laptop burn on me once.

Hang on a sec here! Li-Ion as used in laptops or phones are quite different beasts from LFP's or LiFePo4 batteries, which are generally used on boats. Well, not "generally" just yet, but they will be in a few years time.

So please don't mix up those two batt technologies. LFPs are quite safe.
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Old 10-09-2016, 12:21   #34
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Re: Right batteries for cruising

Quote:
Originally Posted by StuM View Post
I presume that you meant Amp hours, not cranking Amps.

But who knows? Please use the correct units when discussing electrical systems here.
Who ever said anything about CCA. Only Sears with their Die Hards uses CCA for capacity. In the marine world of house batteries, it's Amps as in Amp Hours.
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Old 10-09-2016, 14:04   #35
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Re: Right batteries for cruising

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Originally Posted by roverhi View Post
Who ever said anything about CCA. Only Sears with their Die Hards uses CCA for capacity. In the marine world of house batteries, it's Amps as in Amp Hours.

amps and amp hours are totally different.
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Old 10-09-2016, 18:19   #36
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Re: Right batteries for cruising

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Originally Posted by roverhi View Post
Who ever said anything about CCA. Only Sears with their Die Hards uses CCA for capacity. In the marine world of house batteries, it's Amps as in Amp Hours.
Not, it's Amp hours, not Amps.

Rather than going through it all yet again. You may like to look at these two links.

What is your Real Amp Hour per Day Usage

What is your Real Amp Hour per Day Usage
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Old 11-09-2016, 00:45   #37
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Re: Right batteries for cruising

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Originally Posted by StuM View Post
Please use the correct units when discussing electrical systems here.
Quote:
Originally Posted by chala View Post
Curious the teacher got it wrong. v Amps/Hr
Got to be the mango season in Port Moresby.
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Old 11-09-2016, 02:13   #38
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Re: Right batteries for cruising

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Originally Posted by chala View Post
Got to be the mango season in Port Moresby.

Still cross posting quotes from one thread into another and still getting it wrong.

Must be peanut season in the monkey house.
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Old 11-09-2016, 15:42   #39
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Re: Right batteries for cruising

Gosh, LOL Always such a popular topic.
My 2 bobs worth, I simply run x2 parallel 150AH AGM Deep Cycle Marine batteries in a live aboard 40 ft yacht, solar top up. 40amp 8 stage charger (a must) from my Yamaha generator, as no amount of batteries will stay charged with regular daily use, especially if you experience no sun for a few days lol.

Yes, AGM are heavier than other alternatives, however, once they are in, that's it. For my mind they are the best battery for marine power, with zero maintenance.
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Old 12-09-2016, 14:58   #40
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Re: Right batteries for cruising

Quote:
Originally Posted by S/V Alchemy View Post

clip...

I have six L-16s, a fairly heavy (120 pounds, but I can manage it) 6 VDC FLA battery. They are series-parallel wired to make one considerable 1,575 Ah house bank.

clip...
That's astounding. I want to know where to buy 525AH L16 batteries and how much they cost.

My first set were high-capacity, at 440AH; the standard I went with due to their being nearly half the cost are 370AH.

My current set should have at least another 3-5 years in them, but my 4-unit bank is only 740AH and I'd dearly love to have over 1000AH in the one box.

Thanks for alerting me to the possibilities.

What is the designation of those (L-16HC was my 440AH set, just L-16 is my 370AH set), where did you buy them (locally sourced or shipped) and how much were they?

Inquiring minds want to know.

Thanks so much!

L8R

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Old 12-09-2016, 15:10   #41
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Re: Right batteries for cruising

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Originally Posted by donradcliffe View Post
.........--lead acid battery cells are 2V each, so 6V batteries are 3 cells wired in series internally, and 12v batteries are 6 cells wired in series internally. Do you really think there is a difference, other than the one extra external wire you need with 6V batteries in series??
This is correct. The only difference is that the twelve volt battery has all the cells in one case.
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Old 12-09-2016, 16:32   #42
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Re: Right batteries for cruising



Interesting wiring arrangement. Tesla investigated wireless "broadcast energy" a hundred years ago, and here we have it on your boat.

Where is the rest of the input/output wiring, fusing and hold down straps?
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Old 12-09-2016, 20:26   #43
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Re: Right batteries for cruising

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Originally Posted by barnakiel View Post
I never use 6V in a 12 or 24V system.

Asked others the answer seems in a big boat only 6V units are easy to manage without a crane. I agree.

As long as the boat bank is not 'huge', I would always use 12V units in a 12V wired boat.

b.
Apart from my initial post, this is the only other sensible or legible one here, LOL (not really, I'm just being cheeky)
12V system=12 volt batteries, marine conditions=deep cycle marine batteries. And I have read very, very few articles that suggest anything over AGM for the majority of situations. I see absolutely no point or even practical reason in straying from this very, very simple formula. It seems some people are also attempting to wire and power up the space station Heeeeeee lol

I am sure the odd scientist or self confessed electronics genius will disagree
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Old 12-09-2016, 23:56   #44
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Re: Right batteries for cruising

I really like the looks of the Firefly battery, but will wait to see where the jury stands after a couple of years. I've got to buy a new house bank/starter + windlass + bow thruster batteries (haven't decided on the thruster yet). I am looking at some substantial spending, but based on the foreseeable future, I won't need a huge bank and will probably go the road of lead acid, and most likely 6V Trojans. I've used them before and they've served me well.

It will save a few bucks in the short term. I can get the T-105's for around $170 locally. So $370 with tax out the door for 225(?) amp hours @ 12V versus Firefly Carbons at $530 with tax for 116 amp hours @ 12V isn't worth it right now.

To help things I'll be replacing all interior lights to LED's, as well as having an updated radar that uses way less power. Doing whatever I can to keep the usage down from the ground up should help.

Everything is a compromise when you have a budget.
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