PV on flat roof

pile-o-stone

JKenH wrote: »

I like the garage. I have an E/W set up which is useless in winter. Best so far this year is just over 8 kwh from our 7.8 kw system. With a flat roof one would presumably get some (if not much) sun all day long but most around noon. In that respect I am thinking a flat roof might have a similar (but shallower) PV curve to a South roof. Do you have individual readings for the 3 roofs or are the East roofs combined?

The E/W panels on the garage are combined onto a single 3.68kw inverter and the panels on the woodshed roof are attached to a 1.5kw inverter. The woodshed panels do seem to better at noon and in winter than the garage panels. Its hard to be sure as they're different outputs and the 1.5kw inverter doesn't show the output in KW, it has a simple LED panel that indicates 0-25%, 25-50%, 50-75% and 75-100% power generation. I do have wifi dongles on the two inverters but as the garage and house are built from substantial bits of rock and are detached from each other, the wifi signal often drops and I have to re-connect them, which is a faff. I tend not to check the outputs anymore, apart from a casual glance at the inverters when I'm in the garage to check they're working on a sunny day and a glance at the smart meter unit to see if I'm negative.