Need a Solar panel stepup Charger Controller as my solar panel has no sun light because I live in a Flat and the solar panel are mount on the balcony and it take to long to charge the battery all any project that can help. my Solar panel I have is 12v 20w and a 12v 40w with a Duo-battery charger which is a epip20-db series my Email is rank400@iprimus.com.au