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| pjb Member Since: 08 Apr 2009 Location: Sunny Oxford Posts: 1244  |
Hi
I have installed via an auxilary fuse box a suppy to a double USB charger & a battery voltage meter & my dash cam. The idea was to leave as a permanently live supply but have decided not sensible as when left for a week they along with the tracker etc etc help flatten the battery. So what I would like to do is either have the supply that stays on for say 60 minutes after the ignition is turned off, or have it such that it turns off once the battery is below say 12 volts. What do I need to do this any suggestions as to the best way ? If it makes any difference the fuse box is in the passenger seat box next to the battery The plan is also to feed another USB charger & cigarette lighter socket at the back of the cubby box for rear passengers to use, and would want to power these by a similar nature. Cheers & Merry Christmas 2020 P300 HSE |
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19th Dec 2016 9:21am |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1116  
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Hi,
I was about to install some "zero-standby" switches along with the various aux/usb supplies I'm going to install. But I prefer your approach, the timer in particular. Currently I have a simple low voltage disconnector to prevent the fridge etc. to drain the second battery. This seems to be a good read: https://dashcamtalk.com/battery-discharge-prevention/ Many products even seem to combine voltage thresholds with a timer! Thanks for putting another item on my to do list 
cheers Frank |
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19th Dec 2016 12:03pm |
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| pjb Member Since: 08 Apr 2009 Location: Sunny Oxford Posts: 1244 |
Thanks Frank
A good read.
My concern is they are all for dashcam type outputs - so quite small, I'm not sure if they are heavy duty enough for what I'm looking for  although I could perhaps use it to control a relay  2020 P300 HSE |
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19th Dec 2016 12:12pm |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1116
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ah, you're so right - 1A
 I think the little device I have, might also just be good for 5A.
This seems to be more like it http://www.dmsshop.co.uk/rflvd10-low-volta...-269-p.asp There are variants of upto 200A 
No timer though and I can't find the voltage thresholds, can you? Maybe you'll find something similar? |
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19th Dec 2016 12:25pm |
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| DuncanS Member Since: 07 Dec 2013 Location: Cumbria Posts: 299  
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Although not particularly cheap, its exactly the thing that you want:
http://www.12voltplanet.co.uk/adjustable-d...v-10a.html North Cumbria Search and Rescue - Team Leader |
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19th Dec 2016 1:45pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512 
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Just out of curiosity, what would be the purpose of this set up? What appliances would be powered for one hr after ignition is switched off? Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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19th Dec 2016 7:33pm |
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| DuncanS Member Since: 07 Dec 2013 Location: Cumbria Posts: 299
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Very handy if you're nipping out to the shops with the kids still on board, busy away flattening their phone batteries but you don't want to leave the keys in. North Cumbria Search and Rescue - Team Leader
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19th Dec 2016 7:35pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512
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Ah, I see... I have a very sophisticated solution installed for that purpose: a manual switched USB outlet on permanent live.
 Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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19th Dec 2016 7:39pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11325
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Driving a relay to switch on the fused power supply would seem to be the easiest solution. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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19th Dec 2016 9:13pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8264  
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a voltage sensing relay such as the likes durite sell would do it Cheers
James 110 2010 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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19th Dec 2016 9:23pm |
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| pjb Member Since: 08 Apr 2009 Location: Sunny Oxford Posts: 1244 |
thanks gents
A voltage sensing relay it is 2020 P300 HSE |
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20th Dec 2016 9:22am |
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