I am considering a 5kW PV system with 10kWh battery or supercapacitor storage.
As an aside, are there any good reviews available comparing Li-ion batteries vs supercaps?
Including line charges and tax I pay about NZD0.25 / kWh importing and would receive about NZD0.07 / kWh exporting to the grid. Minimising exporting electicity to the grid is therefore of interest!
Are there automatic switching devices available that prioritise feeding a heirachy of house circuits, to minimise exporting PV electricity to the grid
- Lighting (on dedicated / fused circuits) + fridge / freezer (would need to ensure it is on a dedicated circuit?) has 1st priority
- General wall socket circuits have 2nd piority, when the lighting & fridge load has been satisfied
- Hot water cylinder (on a dedicated circuit / fuse) receives power after loads 1 & 2 have been satisfied
- “Night store” heat storeage heater (on a dedicated circuit / fuse) receives power after loads 1- 3 loads have been satisfied.
Any informative suggestions / comments would be gratefully received.