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Old 05 September 2015, 03:47   #21
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Yeh but you are using 2 x 75Ah leisures...

That doesn't feel like "I need a cheap simple solution for my boat battery" - Basically the OP wanted to know which battery to buy. But now we have him installing dual redundant batteries, 1,2,1+2 isolators etc just to be able to get his engine to start when he turns the key...
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Old 05 September 2015, 05:06   #22
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As long as he's not running lots of electonics with the engine off any old car battery will do as long as the cca is big enough a 75 isn't going to need a huge battery probably something from an average saloon will do
I never buy fancy batteries & never have problems with life span.Leaving any battery untouched for a long period isn't good for it no matter what it costs. My philosophy is if it's cheap in the first place & it lasts 5 years then buy another cheap one to replace it
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Old 05 September 2015, 05:20   #23
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......just to be able to get his engine to start when he turns the key...
Which in my book, is pretty fundamental . After being the subject of a "Mayday" call in the past due to a dud battery, I no longer skimp on batteries. Like I said early on, it's down to your attitude to risk & the depth of your pockets. Personally I think the OP will be fine with a decent automotive battery of the correct CCA/MCA for his engine, that will fit in the available space. I wouldn't expect to pay more than 100 to achieve this. IMHO
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Old 05 September 2015, 06:00   #24
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You can rope start a 75 two stroke if you do get caught out. It's rare to have a battery fail 2nd or 3rd start of the day unless there is another fault with the engineor there is another drain on the battery.Batteries usualy die when left for a period of more than the few hours your out boating
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Old 05 September 2015, 07:00   #25
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Yea and you could rope start my 150 but would not like to try it in a bouncy sea!! I have two bats. 85 ah and a 110 ah 900 cca for the engine but I still on long hauls carry a bat pack.


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Old 05 September 2015, 11:43   #26
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Yeh but you are using 2 x 75Ah leisures...
Yeh. There are two, Numax 59.50 each of ebay . "Main/backup" type configuration and I've never had to use the backup. The prospect of my memory letting me down is far more real than the likely hood of a battery failing and that's why I've got two. But if I forget to switch off the bilge pump it really ain't going to make much difference what kind of batteries I have.......... I'm coming back to a flat one.
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Old 05 September 2015, 11:59   #27
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Rib battery?

You must be away for a hell'va time!! Or have a great pump. I have a 1100gph rule on mine with a 85 or 110 ah bats and over normal wx I can leave it five weeks and still have 60%
Of bat to turn engine


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Old 05 September 2015, 15:27   #28
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You must be away for a hell'va time!! Or have a great pump. I have a 1100gph rule on mine with a 85 or 110 ah bats and over normal wx I can leave it five weeks and still have 60%
Of bat to turn engine


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5 weeks = 35 days = 840 hrs.....Fused at 6 amps (recommended.) even if it was only drawing a tenth of that spinning dry that equates to 504AH. What's more the spec on the 12v Rule 1100GPH I've just seen only rates the motor for 1500 hours. So, if you leave the pump running for 5 weeks twice, the the motor is going to be pretty well knackered. There really is nothing special about the pair of 600gph pumps I run but your battery really must be something special or the pump is being left in "auto" and not actually running continuously.
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Old 05 September 2015, 15:53   #29
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Oh yes it's in auto with float switch you wouldn't leave it on a mooring running continuously


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Old 05 September 2015, 18:36   #30
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5 weeks = 35 days = 840 hrs.....Fused at 6 amps (recommended.) even if it was only drawing a tenth of that spinning dry that equates to 504AH. What's more the spec on the 12v Rule 1100GPH I've just seen only rates the motor for 1500 hours. So, if you leave the pump running for 5 weeks twice, the the motor is going to be pretty well knackered. There really is nothing special about the pair of 600gph pumps I run but your battery really must be something special or the pump is being left in "auto" and not actually running continuously.

I know the weather can be iffy on the west coast, but I don't think it rains continuously for 5 weeks.... Ok it might, but not enough to put 600gph into a RIB


.....sh1t happens.......
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