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Old 20 November 2012, 21:18   #1
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Best battery set up?

wondering the best way to set up 2 batterys, engine is a 90hp yam autolube and will be using rib for fishing etc so dont want to drain batteries with gps/ fishfinder. Can you advise in novice explanations how i set up & is it worth charging both off engine????
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Old 20 November 2012, 21:29   #2
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You just need to fit a VSR (voltage sensing relay) that will look at the battery level and charge each battery as required. We tend to fit Blue Sea systems as they dont break the bank and they work very well and have proved to be very reliable.
Click the link....
Aquafax Marine & Industrial Equipment
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Old 20 November 2012, 21:48   #3
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You just need to fit a VSR (voltage sensing relay) that will look at the battery level and charge each battery as required. We tend to fit Blue Sea systems as they dont break the bank and they work very well and have proved to be very reliable.
Click the link....
Aquafax Marine & Industrial Equipment
had quick look on ebay and there is durite one for 40
what best batteries to use that will go well with 90 yam???
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Old 20 November 2012, 23:27   #4
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Depending on whether you have isolator switches already something like this is ideal, although possibly a little pricey from Force 4.
BEP stuff is pretty good quality:

BEP Dual Battery Single Engine VSR cluster - Only 158.95 - Force 4 Chandlery
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Old 21 November 2012, 07:01   #5
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Guessing it all depend on batteries ratings but what would be best /suitible for my yam 90? I don't have clue being newbie
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Old 21 November 2012, 11:50   #6
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Great ideas above. For me, I use a simple inexpensive 12 volt battery selector switch; Batt 1, Batt 2, Both and OFF. One I use for Electric Motor (direct wired), the other for all Electronics and can cross energize should the need arise. When switch is in off position I charged the two batterys independantly.
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Old 21 November 2012, 11:59   #7
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This me thinks aink going to be easy wiring myself :-(
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Old 21 November 2012, 14:28   #8
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I think the Blue Seas 7650 is a cheaper option than the BEP. A little over 100usd:
http://www.tacticalwholesalers.com/B...y_p_76341.html

From Blue Seas page:
http://bluesea.com/products/7650
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Old 21 November 2012, 15:36   #9
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Spoke to chandlers and they recommend no less than 85ah battery so what size sensing relay would be right choice, there is durite one on ebay 120ah for 38.99
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Old 21 November 2012, 16:12   #10
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It just depends on the output of your alternator as to how much current might get sent through the VSR. However, it's unlikely to be over 100A so the durite would be fine. I'd be tempted to go for a marine one though as they are better sealed against corrosion.
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Old 21 November 2012, 17:11   #11
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so if i was having 2 batteries onboard then go for 2 85ah batteries if chandler reccomends no less than 85ah single ? take point on waterproof/marine vsr but im sure id be able to fabricate weatherproof box out of ali n tig weld it up to help keep moisture out.....
Anybody any clues to what output alternator would be on my yam 90hp
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Old 21 November 2012, 17:48   #12
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Anybody any clues to what output alternator would be on my yam 90hp
I'm guessing but maybe 50 or 60 Amp at max output. Never likely to get this much charge going into the batteries though as the flatter they are the higher their internal resistance.
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Old 21 November 2012, 18:18   #13
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cheers erin, kind of all making little bit sense now, i like to look into thing n gain folks knowledge and research it before buying just want to make sure never loose power out there and have my pals down local rnli have to tow me back just because of dead battery haha, watching vsr on ebay ends later so may go for it
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Old 22 November 2012, 10:48   #14
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take point on waterproof/marine vsr but im sure id be able to fabricate weatherproof box out of ali n tig weld it up to help keep moisture out.....
Ally, DC current, & seawater have never been a good mix
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Old 22 November 2012, 17:30   #15
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Ally, DC current, & seawater have never been a good mix
weld ali boats everyday mate its me job, in water too
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Old 22 November 2012, 17:45   #16
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weld ali boats everyday mate its me job, in water too
Fair do's, but those ally hulls by their very nature are grounded so all the stray currents are earthed. If you stick your ally switch box on the transom (GRP) just make sure it's well bonded to earth or it'll start to fizz eventually. The inside will get salty & damp which will allow stray voltages to track from the +ve 12V from the switch & before you know it the whole box is somewhere between 0 & 12V which will try & earth itself. You need to make sure that the switch, cables & terminals are well sealed & insulated.
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Old 22 November 2012, 17:52   #17
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So would you be inclined to use large junction box even inside console?
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Old 22 November 2012, 18:21   #18
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So would you be inclined to use large junction box even inside console?
Yup, every time. My isolators are mounted in an IP65 box inside the console & the terminals are coated in silicone grease. They are still pristine after 4 years.
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