A 300W solar panel can produce around 900 kWh per year if it gets around 8 hours of good sunlight per day.
There are around 74 million single-family homes in the US.
The BitAxe Ultra bitcoin miner has a hashrate of around 0.5 TH/s.
At an efficiency of 20 J/TH, each BitAxe Ultra would consume around 10W of power.
So if every US household installed a 300W solar panel and a BitAxe Ultra:
74 million homes x 300W solar panel x 900 kWh/year = 20.1 billion kWh/year total solar production
74 million homes x 10W per BitAxe Ultra = 740 million W = 740 MW total power for miners
At 0.5 TH/s per BitAxe Ultra, total network hashrate would be 37 million TH/s.
This is around 60% of the current Bitcoin network hashrate of around 62 million TH/s.