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Installation Guide SB30-40US-IUS103030 65
Waiting
The inverter has determined that there is enough voltage from the array to operate and is checking
the condition of the grid prior to connecting to it.
Normal operation
The inverter is feeding the utility grid in either “MPP”, “Constant Voltage” or “Turbine” mode.
“MPP” Mode: The Sunny Boy adjusts the voltage and current from the PV array to obtain the greatest
PV output power.
“Constant Voltage” Mode: The voltage from the PV array has been set to a fixed value. This value is
set by using the Sunny Boy Control or the Sunny Data software. (The parameter name is “V-Const”)
This mode is typically used for fuel cell or micro-hydro applications.
“Turbine” Mode: This mode is used for DC rectified motor sources with a dynamic power curve
(typically wind turbines). The user can set the magnitude and slope of the curve to match a particular
alternator.
Derating
The Sunny Boy is designed to operate at full rated power up to +113°F (+40°C) ambient. The
inverter will continue to operate beyond +113°F (+40°C) and will derate as required to maintain
a safe internal component temperature. Unnecessary derating can be caused by blocked fan intakes.
For this reason the fan intakes should be inspected often and cleaned when needed.
If the inverter fails to connect to the utility grid 3 times in a row, it will wait 10 minutes before
the next attempt.
In case of a grid failure, the Sunny Boy waits 5 minutes before reconnecting to the grid.
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