I'm gathering the parts for this very project. eBay has Intelli-Power 9100 series starting at $80.00 for a 30A new in the box. The 40A goes for $110.00 and the Charge Wizard is $13.00. The 45A with the Charge Wizard is $129.00. There are also any numerous styles and types of fuse blocks on eBay also, from $1.00 to $30.00.