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Old 10-24-2013, 07:08 PM   #21
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As long as the batteries are secure and don't allow the terminals to short, you should be good-to-go.

I had the same situation with my mains. Boat had built in fiberglass double 8D sized box and I swapped the 8D's years ago for 4D batteries. I cut two blocks out of hardwood to take up the extra space and it's been that way for years, no problem.
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Old 10-24-2013, 08:04 PM   #22
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A question. My battery box(solid fibreglass unit, came with the boat) is too big for the genset battery so I have book ended the battery with some polystyrene packing to keep it from moving.

Would this cause any potential issues?
No.
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Old 10-25-2013, 12:35 AM   #23
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Originally Posted by Edelweiss View Post
As long as the batteries are secure and don't allow the terminals to short, you should be good-to-go.

I had the same situation with my mains. Boat had built in fiberglass double 8D sized box and I swapped the 8D's years ago for 4D batteries. I cut two blocks out of hardwood to take up the extra space and it's been that way for years, no problem.
LB
The P.O of my boat had a great idea, they made a rack out of wood to take up the extra space in the battery box that was built for 8d's that has a 4d in it... the wood was drilled to hold extra downrigger balls. The balls are heavy and can make a big mess if they get loose in the hull
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Old 10-25-2013, 12:55 AM   #24
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Please explain why a single starting battery isn't sufficient for the main propulsion engines as well as the genset. It isn't obvious to me why the genset needs its own starting battery.
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Old 10-25-2013, 01:33 AM   #25
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It isn't obvious to me why the genset needs its own starting battery.
It is ultimately a matter of redundancy. You want your generator battery fully isolated so if you run down all the rest of the batteries, you still have a battery to start the genset...and hence have the battery charger available.
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Old 10-25-2013, 01:34 AM   #26
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Please explain why a single starting battery isn't sufficient for the main propulsion engines as well as the genset. It isn't obvious to me why the genset needs its own starting battery.
Redundant safety strategy! As in: If main propulsionís battery fails there is gen set batt as back up - or vice versa!

Personally... I always carry a triple batt safety hedge aboard, i.e. main bank of four (4) deep cycle 31ís that also are used for propulsion starter batts / one (1) gen set 27 starter batt / one (1) isolated, never used and fully charged 27 batt (in black box hooked up to nothing, with its own low amp charger that activates when AC power is on). And, of course, I also have a 27 batt on our runabout that also might or might not go kabloeeee!

Sooo I feel confident that chance for unmanageable batt problems are very limited in our case while out and about!

PS: Did I mention the fully charged 31 deep cycle we always load and leave in SUV when we go to boat for fun-time!! LOL
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Old 10-25-2013, 01:43 AM   #27
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So, you fellows believe at least three engines (not counting thrusters) and at least three, four, or more battery banks are needed to feel comfortably safe? Do you also have double hulls?
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Old 10-25-2013, 01:53 AM   #28
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So, you fellows believe at least three engines (not counting thrusters) and at least three, four, or more battery banks are needed to feel comfortably safe? Do you also have double hulls?
Just douple/triple batt protection! Inexpensive safety - Try it... You'll like it!

BTW - Tolly hull is 3/4 to 1 1/4 inch thick FRP throughout its bottom. Could be called a double thick hull!
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Old 10-25-2013, 02:05 AM   #29
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Have found two sets of batteries, a single engine (with anchor and towing insurance not yet required), as well as a steel hull, to be sufficient.
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Old 10-25-2013, 05:24 AM   #30
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IF the weight and maint of multiple batterys are aboard the option of using them for multiple redundancy for the price of a switch or two makes good sense.

Of course this assumes the boat operator understands the setup.

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Old 10-25-2013, 08:11 AM   #31
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Have found two sets of batteries, a single engine (with anchor and towing insurance not yet required), as well as a steel hull, to be sufficient.
Well yes, until they are not sufficient, you are absolutely right. If those batteries fail then the separate back system would be sufficient and if they fail, then the Art, triple back up system would be absolutely right.

If that fails, then you could consider yourself extremely unlucky or inept.

It all depends how far down the back up line you feel you need to go.
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Old 10-26-2013, 04:06 PM   #32
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Went with a group 24 in 650 CCA at 80 hours from West Marine. They were cheaper then Wally World and oreilly's.

Thanks for the inputs. The genset fired right up.
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Old 10-26-2013, 06:02 PM   #33
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Battery box two big. If you are putting a smaller battery in a battery box give some thought to filling the extra space in a way that does not further insulate the battery. Leave room for air to circulate around the battery as much as possible. One inch strips of wood can hold the battery in place while still allowing air to reach the sides of the battery.

I actually tested one of my batteries both ways and noted a temperature increase when I did not leave a space for air.

Marty
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Old 10-29-2013, 07:39 AM   #34
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CCA are not measured in hours.

The 20 hour rate is the std for most non starting batts.

>Went with a group 24 in 650 CCA at 80 hours from West Marine.<


?????????????????
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Old 10-29-2013, 02:36 PM   #35
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CCA are not measured in hours.

The 20 hour rate is the std for most non starting batts.

>Went with a group 24 in 650 CCA at 80 hours from West Marine.<

?????????????????
I never said they were.

650 CCA.

80Ah

12 volt Starting.

Should have clarified it.
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