Emergency starter

sailorman said:
i have a Halford`s one at home it cost about 50 sqiuds 2 yrs ago & has a compressor as well that is very handy.it can be charged 12 or 240v
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So if it can be charged 12 volt does that mean that whilst my main batteries are on charge from shorepower I can just hook the starter unit to the batteries & charge that from the 12 volts as well?
 
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I don't really understand what the OP's problem is. With 2 batteries the idea is that you use one for discharge on domestic services while quarantining the other for engine start.
Where the batteries are identical it is a good idea to alternate batteries used for start or domestics. It is simply a matterof discipline to start on one occasionally to ensure it will start then check the other in the same way. Most people will usually start on both meaning that when the engine starts to charge it will charge both batteries. However if you reckon you have largely discharged one battery then start on the other then switch to both for charging. with 2 batteries there is redundancy if managed properly.

Now rather than buy a jumper start pack with a tiny battery why not buy a proper engine start battery as used in cars. OP can then parallel the 2 big domestic batteries and connect the engine start battery as the other of the 1,2,both.
However much better is to fit a VSR so that engine start battery is always quarantined form domestic discharge but alternator always automatically charges all batteries together. You then can have a jumper lead to start engine from domestic batteries or have a VSR with emergency start function or fit a relay for emergncy start.

What OP should really do is explore the electrical system to understand it himself. good luck olewill
 
William_H said:
I don't really understand what the OP's problem is. With 2 batteries the idea is that you use one for discharge on domestic services while quarantining the other for engine start.
Where the batteries are identical it is a good idea to alternate batteries used for start or domestics. It is simply a matterof discipline to start on one occasionally to ensure it will start then check the other in the same way. Most people will usually start on both meaning that when the engine starts to charge it will charge both batteries. However if you reckon you have largely discharged one battery then start on the other then switch to both for charging. with 2 batteries there is redundancy if managed properly.

Now rather than buy a jumper start pack with a tiny battery why not buy a proper engine start battery as used in cars. OP can then parallel the 2 big domestic batteries and connect the engine start battery as the other of the 1,2,both.
However much better is to fit a VSR so that engine start battery is always quarantined form domestic discharge but alternator always automatically charges all batteries together. You then can have a jumper lead to start engine from domestic batteries or have a VSR with emergency start function or fit a relay for emergncy start.

What OP should really do is explore the electrical system to understand it himself. good luck olewill
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Firstly I need much more power for autopilot, nav lights etc ( no i do not have a fridge) so hence the need to couple the 2 batteries to give 200 amps
Secondly they are the largest i can get into the space
Thirdly there is absolutely no where near the existing batteries to place another & altering the wiring to accommodate this would be a nightmare. Extending the wiring over a longer distance would not be good. I do not want any more weight in the stern as with all modern yachts of this type everything goes aft & the stern drags so another battery needs to go forward , further from the engine
Fourth I do not want to mess with the original neat layout of the wiring & cock something up from a system that works very well apart from the storage limitations.
I do not have to switch batteries on & off for charging. i turn on 2 separate batteries & get going. Still do not know how that works.it just does
If it did go wrong I have a spare circuit independent of anything else laying in wait to connect GPS & VHF to the batteries. What I do not have is a way of bypassing the feed from the engine to the batteries to get the engine running if my batteries went flat or the wiring burnt out. Now with a starter pack I hope to stick the negative on the engine & positive on the glows to warm them then move the positive on to the starter & spin it over.
That is the theory at least !!!!!!!!!!!
 
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