Batteries are the tool needed to compensate for the wide fluctuation in solar output. If the house is using 5kw and the solar is at 5 kw output, perfect. But cloud comes over, solar drops to 1kw, house load cannot be turned off that fast.
Then cloud passes and solar jumps to 8kw. House can find or turn on loads fast enough.
It is the hybrid inverter that with the aid of a battery bank that ‘blends’ the variations together. When cloud comes over house takes energy from batteries, and when solar goes higher than house loads, the batteries are instantly sucking in the excess energy. Battery can track the energy variation from solar in realtime, the house loads cannot.
In a grid tie situation the utility does the realtime give and take processes.
Most people do not know that when you install the battery backup system, many grids have the right to take your power from the batteries into the grid to offset shortages in other areas.
“Batteries are the tool needed”
Large, all day supply hot water heaters could be made to store water heated up to 180 degrees.
Houses could be cooled below the the desired temperature to a colder temperature that is tolerable.
Cars could be charged up at 8am to 5pm work hours from panels on an commercial building or parking lot roof and the excess battery charge of the car could be used to power a house at night.