Let there be light!...and there was light.
So...after two days of worry we finally have our power back. The electrician came yesterday to look at the system but we were both out at work. Will had messaged them with all the information and when he got home before me, switched on the lights and the power went off again.
Of course now we thought it was something serious like our $6000 batteries were dead and we were feeling pretty low about everything. The electrician came back this morning before we both went off to work and finally discovered it was a broken fuse!
It is such a relief!