Hi Frank, Been looking for someone with a Delios inverter mine is a dls 600 and has failed. Delios has been in administration for about 2 years from what i can make out and my inverter has gone dead no display so no access to the programme. Think the monitoring software was pulled last week just wondered if you had an issue with yours and indeed if you still have monitoring by Delios. The agent here in the UK pullled out a couple of years ago so no support and I still have 2.5 months left on its warranty.