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The Norfolk Broads Forum / Broads Boat Owners Q & A / Starter Battery advice
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Posted By Discussion Topic: Starter Battery advice

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Stingers
Sep-13-2019 @ 9:27 AM                           Permalink
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And if the domestic battery was run down low you would have trouble starting the engine, which defeats the object of having separate starting and domestic batteries.

Andy

annville
Sep-13-2019 @ 10:34 AM                           Permalink
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Hi Adrian NO NO the heater plugs should run from the ignition switch which should be on the starter motor circuit, ie engine battery which should be separate from domestics except for automatic relay or similar for charging purposes, or if two alternators, one on one. there are more complicated systems/circuits which i have. You need to rewire to original spec, why on earth would anybody wire it that way recipe for disaster. John

Bluebell
Sep-13-2019 @ 5:52 PM                           Permalink
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"BUT its a compromise a starter has different plats ie thicker and less 7 to 9 where as a leisure has 11 to 13 thinner plates"

Are you sure? I still think it's the other way round. To get a good cold cranking amps (CCA) you need a larger surface area - hence more thinner plates.


pargeandmarge
Sep-13-2019 @ 6:24 PM                           Permalink
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Dear Bluebell
The thicker plates are for the men because they are cranks.
The thinner plates are for the ladies because they draw the power elegantly, gently, slowly, recharge a little along the way and then all of a sudden take all of it.
Has been this way before stinky boats and always will be. Smile
No harm meant to anybody.
Kindest Regards
Marge and Parge

ADI
Sep-13-2019 @ 8:34 PM                           Permalink
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I might be wrong then, the reason i said the heater plugs are connected to the domestics is because when i turn the key to preheat the battery indicator for the domestics dim and allways have done i've had the boat 10 years and i know it was looked after by herbert woods for 10 years before i bought it, its mainly allways started with no issues.  Confused  Question

Regards

Adrian  Michelle

Beck  Braydon and Mere.

annville
Sep-14-2019 @ 10:50 AM                           Permalink
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Hi Adrain Do you use the ignition switch to preheat or a seperate button if you only use the ignition key switch to do both unlikely to be on a different circuit, easy to tell switch of domestic bank only switch on engine battery does heater plugs work?,how do you charge your domestic bank do you have a relay/diode pack or do you switch on once started, all though the neg/black wires connect together the red/pos ones should be seperated and not both connected at alternator without being seperated by relay/diode  does your volt meter work on both banks or do you have seperate volt meters. John

annville
Sep-14-2019 @ 11:08 AM                           Permalink
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This message was edited by annville on Sep-15-19 @ 10:15 AM

Bluebell
Sep-14-2019 @ 2:44 PM                           Permalink
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Starter Batteries

The starter battery is designed to crank an engine with a momentary high-power load lasting a second or so. For its size, the battery is able to deliver high current but it cannot be deep-cycled. Starter batteries are rated with Ah or RS (reserve capacity) to indicate energy storage capability, as well as CCA (cold cranking amps) to signify the current a battery can deliver at cold temperature. SAE J537 specifies 30 seconds of discharge at –18°C (0°F) at the rated CCA ampere without the battery voltage dropping below 7.2 volts. RC reflects the runtime in minutes at a steady discharge of 25. (SAE stands for Society of Automotive Engineers.) See also BU-902a: How to Measure CCA.

Starter batteries have a very low internal resistance that is achieved by adding extra plates for maximum surface area (Figure 1). The plates are thin and the lead is applied in a sponge-like form that has the appearance of fine foam, expanding the surface area further. Plate thickness, which is important for a deep-cycle battery is less important because the discharge is short and the battery is recharged while driving; the emphasis is on power rather than capacity.

Deep-cycle Battery
The deep-cycle battery is built to provide continuous power for wheelchairs, golf cars, forklifts and more. This battery is built for maximum capacity and a reasonably high cycle count. This is achieved by making the lead plates thick (Figure 2). Although the battery is designed for cycling, full discharges still induce stress and the cycle count relates to the depth-of-discharge (DoD). Deep-cycle batteries are marked in Ah or minutes of runtime. The capacity is typically rated as a 5-hour and 20-hour discharge.

I have copied and pasted the above from the Battery University https://batteryuniversity.com/learn/article/lead_based_batteries.

And it reinforces what I was taught (many years ago!)




Luise
Sep-14-2019 @ 8:05 PM                           Permalink
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And, interestingly, the builders of my boat saw fit to use an AGM battery for the starter circuit and GEL batteries for the domestic bank. High-spec charger/inverter needed though, to accommodate their differing charging needs...

Peter

ADI
Sep-14-2019 @ 8:22 PM                           Permalink
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Anville

yes its all on the ignition key and a diode splitter to charge both banks of batterys, (starter/domestics) and a volt meter for both.

Regards

Adrian  Michelle

Beck  Braydon and Mere.


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