Home > Maintenance & Mods (L322) > Additional Battery Capacity |
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stan Site Moderator Member Since: 13 Jul 2010 Location: a moderate moderated moderator moderating moderately in moderation Posts: 35217 |
have you read this from the wiki,
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23rd Nov 2018 2:57pm |
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AJGalaxy2012 Member Since: 11 Jun 2018 Location: Gainsborough Posts: 1464 |
Just fit a split charging relay as used for caravans, that would sort out the charging. BMW i3 Electric Car
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23rd Nov 2018 3:05pm |
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millerj90 Member Since: 25 Oct 2010 Location: Melksham Posts: 334 |
Thanks Stan;
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23rd Nov 2018 4:03pm |
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millerj90 Member Since: 25 Oct 2010 Location: Melksham Posts: 334 |
AJGalaxy
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23rd Nov 2018 4:05pm |
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Joe90 Member Since: 29 Apr 2010 Location: Hampshire Posts: 6407 |
Never had a problem with the cables or the fuse.
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23rd Nov 2018 4:09pm |
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Baltic Blue Member Since: 13 Aug 2015 Location: North Wales Posts: 3752 |
I have been trying to find out how the 2 battery system on the L405 works, but without the workshop Manual I am not getting very far.
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23rd Nov 2018 4:11pm |
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Dolphinboy Member Since: 07 Dec 2009 Location: Bristol Posts: 3127 |
I believe dan_1984_uk did this ages ago (with write up?) - I have his car now and it is a lovely job. |
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23rd Nov 2018 4:29pm |
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stan Site Moderator Member Since: 13 Jul 2010 Location: a moderate moderated moderator moderating moderately in moderation Posts: 35217 |
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23rd Nov 2018 4:32pm |
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AJGalaxy2012 Member Since: 11 Jun 2018 Location: Gainsborough Posts: 1464 |
millerj90 You actually said "The problem I cannot seem to resolve is how to protect the 100A cable from carrying "starter current" when the vehicle is cranked.
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23rd Nov 2018 4:47pm |
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millerj90 Member Since: 25 Oct 2010 Location: Melksham Posts: 334 |
Thanks both. I did read that thread and Dan_UK_1984 describes pretty much the same idea i.e. the need for extra capacity. Which is what got me thinking in the first place.
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23rd Nov 2018 4:48pm |
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nicedayforit Member Since: 11 Jun 2011 Location: Beside the Solway Posts: 3969 |
I have a second 110Ah battery fitted in the rear of my car connected to the 100A cable that serves the rear fuse board.
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23rd Nov 2018 5:17pm |
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northernmonkeyjones Member Since: 24 Mar 2012 Location: derby Posts: 8488 |
I think you are skirting the real problem, what is causing the battery drain, my car often gets left for a couple of weeks between runs and I've never had an issue starting it.
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23rd Nov 2018 6:29pm |
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millerj90 Member Since: 25 Oct 2010 Location: Melksham Posts: 334 |
Many thanks for the speedy and informative replies. The wealth and depth of knowledge on this forum is priceless.
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23rd Nov 2018 6:55pm |
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aggraa Member Since: 16 Apr 2018 Location: diss Posts: 33 |
i had this problem with my BMW M3 , leaving it parked at airports/train stations whilst abroad. In the owners manual it said the car will drain the battery @17% per week whilst parked . I had no room to fit an extra battery so I got a solar charger and hard wired it to the battery and bought one of those little jump starter packs as back up . This worked well after I replaced the battery as it struggled to hold a charge after going flat 3-4 times .I bought a C-Tek charger but that couldnt save the battery. |
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23rd Nov 2018 7:53pm |
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