Mo Murphy Posted April 22, 2008 Share Posted April 22, 2008 Can you buy a switch that will cut the supply when a certain battery voltage is reached. I want to leave my cool box running for as long as possible but I don't want to flatten the battery. I thought if I could find this type of switch then I could just leave the box connected all the time and the switch would cut the power before the battery gets flat. TIA Mo Quote Link to comment Share on other sites More sharing options...
cipx2 Posted April 23, 2008 Share Posted April 23, 2008 Try here: http://forums.lr4x4.com/index.php?showtopic=23087 Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted April 23, 2008 Author Share Posted April 23, 2008 Thanks, I knew this had been discussed recently. And with the cheapest at over £50 it will remain just a discussion ! Cheers Mo Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted April 23, 2008 Share Posted April 23, 2008 How about playing with one of the rear electric window cut off relay boxes? my 200Tdi had one (with a 45amp alternator)... if i sat on tickover with lights/heater etc on full, the rear window would turn off. rev the engine it would come back on. think i've got one in the garage somewhere. not sure if it's adjustable inside? Quote Link to comment Share on other sites More sharing options...
MogLite Posted April 23, 2008 Share Posted April 23, 2008 Mo Is £12.95 more to your liking ? I had one of these before I upgraded to an Engel and split charge :-) Andy Quote Link to comment Share on other sites More sharing options...
simonr Posted April 23, 2008 Share Posted April 23, 2008 That looks good Andy! I'll be having one of them! Si Quote Link to comment Share on other sites More sharing options...
TSD Posted April 23, 2008 Share Posted April 23, 2008 PRC4427 keeps it all in the family and can be removed from a scrap Rangie if you're lucky. It is adjustable if you pop the top off. Edited to add: You'll need to use it to switch a relay though. Quote Link to comment Share on other sites More sharing options...
MogLite Posted April 23, 2008 Share Posted April 23, 2008 That looks good Andy! I'll be having one of them!Si Just bee browsing the TowSure catalogue.....they are only £10.50 in there Andy Quote Link to comment Share on other sites More sharing options...
mmgemini Posted April 23, 2008 Share Posted April 23, 2008 Or BM12 or BMIL on this page. http://www.engelfridges.co.uk/ Comes with a voltmeter as well. mike ps. Just checked the link. You need to click accessories to find that. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted April 23, 2008 Author Share Posted April 23, 2008 Well Gentlemen, this morning's posts are a surprise ! Thank you very much indeed ! I'm off to the Towsure website Mo Quote Link to comment Share on other sites More sharing options...
HENNEGANOL Posted April 23, 2008 Share Posted April 23, 2008 Try this site http://www.towsure.com/category/6960-Cool_Box_Power. These are designed for cool boxes and at £10.50 are quite adequate. Gerald Quote Link to comment Share on other sites More sharing options...
cipx2 Posted April 23, 2008 Share Posted April 23, 2008 This must be the cheapest: http://www.maplin.co.uk/Module.aspx?Module...O&U=strat15 Quote Link to comment Share on other sites More sharing options...
mike4444244 Posted April 23, 2008 Share Posted April 23, 2008 Bit thick when it comes to electrics... would it be possible to use the maplin one to switch a relay in line with the 'sense' wire to my x charge? to stop the split charge working if main batt goes below 11.5v, if i just have the alternator connected to the main batt this will mean that the main will charge first then both right? Mike Quote Link to comment Share on other sites More sharing options...
headhunter Posted April 23, 2008 Share Posted April 23, 2008 Mo Look here - http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...A:IT&ih=012 Merlin Power Store are clearing some stock. John Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted April 23, 2008 Author Share Posted April 23, 2008 Thanks John, I'm watching it Mo Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted April 24, 2008 Author Share Posted April 24, 2008 I ordered the Maplins one yesterday, it arrived this morning 20 hours later ! That's not bad service Mo Quote Link to comment Share on other sites More sharing options...
mmgemini Posted April 24, 2008 Share Posted April 24, 2008 Would you let me know how you get on witrh it please Mo. mike Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted April 24, 2008 Share Posted April 24, 2008 Bit thick when it comes to electrics... would it be possible to use the maplin one to switch a relay in line with the 'sense' wire to my x charge? to stop the split charge working if main batt goes below 11.5v, if i just have the alternator connected to the main batt this will mean that the main will charge first then both right?Mike Yes, if you were to connect the voltage sense unit to your main battery, and have it's output controlling the x-charge relay, then if your main battery ever dropped to below 11.5v (or whatever it's set to) then the relay would open and just leave the main battery being charged. however, an observation: if your main battery ever did drop to below 11.5v when the engine was running, then i'd suggest your alternator was knackered. as they usually charge at about 13.4v Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted April 24, 2008 Author Share Posted April 24, 2008 Would you let me know how you get on witrh it please Mo.mike Of course I will, Mike. Mo Quote Link to comment Share on other sites More sharing options...
Eightpot Posted April 24, 2008 Share Posted April 24, 2008 Take a look at the Smartcom unit at Towsure - I've used one for the last two years and would highly recommend - http://www.towsure.com/product/2973-Self-S...elay_Wiring_Kit £13 and will power a second battery and fridge, and shuts off power to either the fridge or battery when voltage drops, then starts powering them again as soon as it hits a certain voltage. Very easy to install, I took a reasonably thick wire straight from the main battery into the input feed, then the same guage out to leisure battery and fridge. It has terminal block type connectors so a five minute job to set up and tuck out of the way, and it's very resiliant to knocks vibration and I've dunked mine under water a couple of times with no ill effect.. Quote Link to comment Share on other sites More sharing options...
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