Thanks for the info Tosh the charging control Would have had two 10amp fuses supplied one for each battery.
Assuming The other was a variflo and not varistream it would have had a 7.5amp fuse supplied to go in the positive feed. Im guessing they were v9 which we built up to october 2013 when the v11 came out.
As I understand Varistream is also supplied with a 7.5 amp fuse. As its not one we build i do not know what additional protection it would have beyond the fuse.
Always interested in feedback that helps us understand the circumstances behind a control stopping. The V11 has a number of layers of protection against miss wire
Dependant on the battery charge state and AH rating. The control can get quite a wallop when polarity is reversed. All DC devices are polarity sensitive so correct fusing is important.
We recommend a fuse should be fitted as close as possible to the battery to give best protection.