Ex Member Posted January 11, 2010 Share Posted January 11, 2010 Some expensive (but certainly nice) solutions there.... A normal battery isolator works fine. Just wire it in a little different to avoid the voltage drop problems. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted January 11, 2010 Share Posted January 11, 2010 Just had a quick look around for lower cost, automatic switching relays. http://www.powerstream.com/battery-isolator.htm 150 Amp break current, spikes to 2200 Amp. Automatic sensed switching based on voltage. $75 Quote Link to comment Share on other sites More sharing options...
haakon Posted January 12, 2010 Share Posted January 12, 2010 I'm going to use this Quote Link to comment Share on other sites More sharing options...
Ex Member Posted January 12, 2010 Share Posted January 12, 2010 I'm going to use this That should work well, but it would be best to have and automatic switch for it. As least for me manual switching (or using the alternator sense wire) will lead to a dead battery at some point. Quote Link to comment Share on other sites More sharing options...
Les Brock Posted January 12, 2010 Share Posted January 12, 2010 Blimey...all that room... You want to fit 2 x Numax's and an Optima in there Quote Link to comment Share on other sites More sharing options...
haakon Posted January 12, 2010 Share Posted January 12, 2010 That should work well, but it would be best to have and automatic switch for it. As least for me manual switching (or using the alternator sense wire) will lead to a dead battery at some point. yes. I'm think of using a relay like this to control the larger relay. Otherwise I'll use the alternator to feed the relay. I now got 2 Optima Yellow top, and I'm not quite sure whether to split them with a relay or not I'm not quite sure if the alternator in my 300 tdi can charge two batteries like this Quote Link to comment Share on other sites More sharing options...
mmgemini Posted January 12, 2010 Share Posted January 12, 2010 yes. I'm think of using a relay like this . Otherwise I'll use the alternator to feed the relay. That's the best way to have to buy a new alternator. Quote Link to comment Share on other sites More sharing options...
haakon Posted January 12, 2010 Share Posted January 12, 2010 Using the alternator to feed or using the other relay? Quote Link to comment Share on other sites More sharing options...
rick111s Posted January 12, 2010 Share Posted January 12, 2010 with the x-eng x-charge system do you need any other electrics as mentioned above? also i found this as a cheaper way on monitoring the batteries (not sure if it would register both or single battery states - http://lechi.com/miniE.htm Quote Link to comment Share on other sites More sharing options...
Ex Member Posted January 12, 2010 Share Posted January 12, 2010 with the x-eng x-charge system do you need any other electrics as mentioned above? You have two choices (being discussed above). 1) Switch the relay using the alternator charge light circuit. The relay will close (connecting the batteries) whenever the alternator is working (charge light is OUT). So no other equipment needed. 2) Use a split charge controller to switch the relay. These sense the voltage and open the relay once the battery has reached a certain charge level. For either system, you can add manual switches to either force the relay open or closed. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted January 12, 2010 Share Posted January 12, 2010 also i found this as a cheaper way on monitoring the batteries (not sure if it would register both or single battery states - http://lechi.com/miniE.htm Personally I would suggest a digital gauge instead. It provides more information knowing the exact voltage. Quote Link to comment Share on other sites More sharing options...
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