Ramp rate
The rate of power increase when first ramping (Start Ramp) and subsequent increases in offsetting or selling (Normal Ramp)
SS: Soft-start ramp rate
When the inverter starts, or tripped due to ride-through timeout, or anti-islanding taking effect, the power will rise or ramp down in accordance with SS setpoint when the inverter start, or reconnect after the utility returns to service.
RR: Normal ramp rate
When the inverter is operating normally, when the power setpoint changes, the power will change in accordance with RR setpoint.