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Mike_B

Member Since: 23 Jan 2011
Location: Moray
Posts: 550

Inventive use of multiple small batteries instead of one.

I've been inspired by AndrewS's Longshanks work of ark and him trying to make best use of the space in the vehilce, by relocating the two batteries to outside of chassis rail.

Theres a bit of info here:
http://www.smartgauge.co.uk/batt_con.html

So, has anybody used multiple smaller batteries to replace one or two big ones? I'm thinking of maybe 8 or ten large motorbike batteries mounted in fabricated boxes along the inside of the chassis rails and/or anywhere else I can cram them.

Normal size batteries wont fit on the inside of chassis rails because of propshaft and exhaust.
I dont want to use outside of rails, as I want aux fuel tanks.

Thoughts?

25th Jan 2015 3:35pm

Mike_B

Member Since: 23 Jan 2011
Location: Moray
Posts: 550

http://www.tayna.co.uk/Odyssey-Extreme-15-Battery-P8677.html

Four of these would make 60Ah and 1480 CCA, compared to an Odyssey PC1500 which makes 68Ah and 1500CCA.

2 banks of four, would pretty much produce the same power as a pair of Odyssey 1500's unless I'm missing a trick.

25th Jan 2015 4:17pm

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

No reason why it couldn't work in theory, you get banks made up of big batteries all the time.

That's not going to be cheap though, those little batteries look like they'll work out at twice the price per Ah and PC1500s aren't cheap to start with. Then you'll have the fun of wiring them all up sensibly which will be interesting and you're not going to be able to monitor them individually either. If one of a bank goes wrong it will be tricky finding out which one.

I think if you've got a good reason to be thinking about it and can accept the minor issues then go for it, but I'd be looking at making a different compromise to make my life easier. With a bit of effort you can fit two standard batteries in the battery box, how much do you gain from this?

25th Jan 2015 8:50pm

Mike_B

Member Since: 23 Jan 2011
Location: Moray
Posts: 550

A very reasoned reply Cupboard.

I've found the Odyssey PC1100 battery, which is 250mm x 97mm and 206mm high.
it's a 45Ah 500CCA battery, so two of these would be more than powerful enough for normal Defender needs (simliar to a standard single battery)

If I bought four of these and mounted them as two pairs, I could treat each bank of two as a single battery. I could monitor and charge each pair as if it were a 90Ah 1000CCA battery.

Pro's
Saves space, if I can mount within confines of chassis legs in steel containers.
Much more power than standard battery
Frees up front passenger seat box, to turn into storage cupboard.
Well protected between chassis legs

Con's
Slightly more difficult to figure out which battery is at fault, although not too bad with only two batteries per bank
Expensive to buy batteries
Bit more labour in wiring them together

25th Jan 2015 9:02pm

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