SOP (State of Power) is a new parameter, calculated and monitored by our electric car chargers (Accelev), starting from 2.12 firmware (update your charger to see SOP).
SOP is intended to be a piece of information about energy grid delivery quality.
Technically SOP depends on the internal resistance of cabling and voltage of your grid. Lower SOP = better grid. Voltage drop per kW of power and starting voltage are used to calculate SOP.
SOP can be:
0-1 = perfect (home cabling and junctions are superconductive, cables are thick)
1-2 = good
2-3 = average
3-4 = bad
4+ = very bad, contact your electrician (losses of energy in cabling exceed 10% of total power; thus, cables are heated).
SOP will be calculated after charging any car for a while.
The charger will monitor SOP and alarm if rapid electric grid degradation occurs - thus it would be an additional ward for your safety.
Please report your home SOP in comments; screenshots are welcome.