Never used a Fusion Dave. Dont know if you have bought one yet but i run one of these.
http://www.fast-lad.co.uk/store/prod...ducts_id=12209
Its superb, will show you at the Players if you`re interested.
Up to 15A charge rate per side, tells you % capacity remaining, balances to 1/1000th of a volt if i recall correctly.
Store mode
Programmable memories for each side that save themselves etc etc