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Electrical & Wiring Engine management systems, looms, switches, gauges, sensors, etc

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Old 29-01-2018, 08:40 AM   #1
spdpug98
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Relocating Battery inside car

My 2018 build is coming along nicely and all mapped for the season, it looks like after all the work my battery has decided to give up on me so have decided as I need to replace it I may as well look to relocate the battery into the passenger footwell

Can anyone help / advise what parts I actually need to move it, is it just extended positive and negative leads, also considering moving to a drycell battery but not sure what one to get
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Old 29-01-2018, 09:28 AM   #2
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if its going inside it needs to be a sealed AGM type battery, aka race type battery from the likes of Oddysey, the common one is a PC680.

http://www.ebay.co.uk/itm/ODYSSEY-PC...Y/252408321860

or their competitor Varley

http://www.ebay.co.uk/itm/Varley-Red...-/371015953567

or you can run a normal lead acid type battery in a box with a vent to outside the cabin.



whichever you choose you need a good sized positive lead to a cutoff switch and on to the starter & alternator and rest of the car, I haven't quite reached this part of the project on the build I'm helping with so not sure on the mm2 cable that is appropriate, but a common scrapyard source is a BMW as they usually have the battery either under the rear seat or in the boot and capable of turning over V8 or 3.0 diesels.
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Old 29-01-2018, 10:55 AM   #3
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Thanks Welshpug, I'll take a look at the links
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Old 29-01-2018, 11:24 PM   #4
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I've used 25mm2 170amps.
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Old 30-01-2018, 06:18 PM   #5
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If it's going into the passenger footwell or just behind the seat you're only going to need about 2 metres of cable.

The starter on a TU is rated at 1400W last time I checked, at that distance you could probably go down to 16mmsq multi strand copper if you're weight conscious. If you're a really cheeky chappy then 10mmsq would still work. any less would probably give you too much of a voltage drop.

Or you can just stick to 25mmsq and not worry about anything.
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Old 01-02-2018, 03:17 PM   #6
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Quote:
Originally Posted by MHR1294 View Post
If it's going into the passenger footwell or just behind the seat you're only going to need about 2 metres of cable.

The starter on a TU is rated at 1400W last time I checked, at that distance you could probably go down to 16mmsq multi strand copper if you're weight conscious. If you're a really cheeky chappy then 10mmsq would still work. any less would probably give you too much of a voltage drop.

Or you can just stick to 25mmsq and not worry about anything.
Thanks, will get some on order this weekend
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Old 02-02-2018, 08:22 PM   #7
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Take into account the rule change from 2017.. Batteries fitted internally cannot be fitted forward of the front seats
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Old 02-02-2018, 09:06 PM   #8
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heard about that but not seen it in writing so to speak.
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Old 02-02-2018, 11:07 PM   #9
MHR1294
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Quote:
Originally Posted by Mike_Roberts View Post
Take into account the rule change from 2017.. Batteries fitted internally cannot be fitted forward of the front seats
That's only if you're carrying a passenger i.e co-driver.

If (for whatever reason) you have a passenger seat but you don't have passengers in the seat for your event then the battery can be mounted on the passenger side in front of the seat. Reason this is allowed is it can't interfere with legs or feet since there won't be a person present in the seat. and being on the passenger side won't interfere with the drivers legs or feet.

That's my understanding of it anyway.
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Old 05-02-2018, 08:30 AM   #10
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I wasn't aware of that rule............although as not a rally car will never carry a passenger
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