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glyn.c



Member Since: 30 Oct 2011
Location: east devon
Posts: 33
England 
TWIN BATTERIES
HI its time to replace the single battery on my 90 Sad so i thought it might be sensible to fit twin batteries NOW ! i have a winch for occasional use dragging the odd lump of timber about and soon can see it possibly being used for self extraction ( up to now i have only used it whilst the engine is running)and i also use a hand help spot lamp quit often without the engine running! .For peace of mind i fancied the idea of separate batteries ! i am looking for suggestions on where to get a suitable tray from and also whether i really need a split charge system installing as well to cope with 2 batteries or whether i could just fit an isolator/diode( suggestions welcome ) to the 1 with the lamp output and the winch on and just connect the 2 together for normal charging .I am trying to keep it as simple/inexpensive as possible . ALL THE BEST
GLYN
Post #121558 5th Feb 2012 6:03pm
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leeds



Member Since: 28 Dec 2009
Location: West Yorkshire
Posts: 8580
United Kingdom 
Simplest and cheapest solution is to connect both batteries in parallel. That way you effectively have ine large battery. Disadvantage if you flatten the battery for whatever reason you will not be able to start vehicle.

Next stage up is to fit a £7 isolator switch between both batteries. Close switch with engine on, open switch engine off. Disadvantage if you forget and flatten battery for any reason you will not be able to start the vehicle.

Split charging systems vary in price with relays from about 30 amp rating. OK for charging 2nd battery but no good for starting engine off second battery.

Split charge systems such as IBS and Blue Sea will automatically ensure both batteries are kept charged. Yes can link batteries for starting engine, winching etc. Downside these sort of systems are £200+, so do not come under the cheap bracket.

Consider carefully your current needs and your future needs.

Twin battery trays are typically £45-60 depending on year of vehicle and manufacter or can make your own.

One thing to consider is height of battery against height of battery box and if close consider electrically insulating battery box lid or chunk of rubber above positive terminal

Brendan
Post #122781 9th Feb 2012 7:23pm
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bpman



Member Since: 21 May 2008
Location: Oslo
Posts: 8069
2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black
I'm in the process of doing just that ...

> I have a pair of Odyssey pc1500dc's
> a BlueSea 7622 (from Leeds)
> a Devon 4x4 puma tray

and a good mate with a crimping tool and bits Thumbs Up

As I fit, I'll put the pics up on the forum

Been reading up on the BlueSea 7622 installation instructions ... too cold to even look at starting it just now.
There are loads of battery management systems on the market, I chose the BlueSea after quite a bit of research, basically as it's simple to install, sensible functionality and will work with a winch if I ever fit one.
Post #122813 9th Feb 2012 8:28pm
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