Ok so will soon be starting to set up my system. Am looking to fit split charge relay for battery, anyone know much about these? The durite 'intelligent' relay keeps popping up when i look on ebay for around £30-£40, seems you dont need to wire up to alternator just straight to your main battery. However can pick up a cheaper one for about a tenner that you rig up to the alternator. Is there any other advantage to these 'intelligant' relays or is it just for the ease of installing? Because if thats all it is will save my money and buy a cheaper one.