Engine start battery

I used an old battery from my even older Rover 75 for many years. When it failed to start my car because it couldn't meet the CCA any more, I used it as a starter battery for the boat (1GM10). I changed it this year as it had a cell down. I used an old 12 volt bike battery for a while:- I could start the engine easily with it once, maybe twice but if there was any problem starting it became flat too quickly so I went back to an auto battery (the spare for my morris minor).

If you must buy a new battery, I'd recommend one from one of the smaller diesel hatchbacks. As has been previously said, check out the Cold Cranking Amps requirement for your engine first.
 
Your house batts will be way more than enough to start that engine. If you use a 1/2/BOTH switch just leave it on the house bank and go sailing.. If you kill the house bank switch to the start battery.

Average CA on those small Kubota's is in the low 100's, measured many of them.. Heck even a small PWC battery can start a small Kubota. The smallest car starting battery you can find will exceed what is necessary to start these motors..
 
Mixing battery types

I was interested in the comment about being able to mix battery types - i can't see how this is possible. My mains charger and my alternator booster both have settings for the battery type to be charged, and charge the batteries at an appropriate voltage for the type of battery. The mains charger has 2 separate outputs - one for domestic and one for starting - but cannot be set to different charging profiles. The alternator output is controlled by a sterling alternator controller and the output is fed into a low loss splitter, so again, both battery banks get the same charge profile. I would like to be able to use a low profile battery for the start battery, but have refrained from doing so, as I don't want to damage it by charging it incorrectly - my domestic bank are Trojan wet batteries. Any constructive thoughts appreciated!

Neil
 
If the engine spec calls for 350-400 CCA then the Red Flash 750 will be suitable. (CCA=380 @ -18C )

Next one up in the range is the RedFlash 1100 with a CCA of 500, not 1150


Like I said earlier check the specs on DMS Technologies own website!

DMS used to style this battery the "Red Top 40" (the battery being 40Ah at the 20 hour rate) and claim a cranking current capability of 1100A but that was based on just a few seconds at 20 degrees, it was not put forward as a CCA. It was a realistic guide for the very weight sensitive racing car market that was the main outlet.
Now they have kept the 1100 figure in the new name Red Flash 1100 but in the specifications give a CCA of 500A to the normal CCA spec.
The 1100 or 1150 CCA quoted by some other suppliers is very naughty and totally unachievable. I'm not sure whether they get their supplies through DMS (who at one stage had exclusivity for the UK retail market but may not now) or direct from Enersys (the manufacturer) but I wish someone would sort them out!
(Actually they must get them from DMS as the Red Flash trademark belongs to them not Enersys, on thinking about it.)
 
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