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Voodoo Solar -- Square D AC Power Disconnect

SquareD HU361RB (8436133)
This is the disconnect that is recommended by SMA (Sunnyboy) for use with their gridtie inverters. It is rated at 600 volts DC, and 30 amps. The DC input of up to two sub-array can be connected to the HU361RB and it is outdoor rated so it can be located close to the panels.


Square-D 240V and 600V NEMA 3R Safety Switch Disconnect (8937203)

According to the National Electric Code, section 690.15, PV arrays must have a disconnecting means to isolate the inverter from the PV power source. Utility grid-tie inverters that utilize PV arrays with voltages above 250VDC require a disconnect rated for 600VDC to perform this function. The Square-D 600VDC 30-amp 3-pole safety switches are UL Listed to handle 12A at 600 VDC per pole. They can be used for disconnecting up to three PV arrays for three grid-tie inverters. It has wiring lugs that are rated to accept two #14 to #10 wires in each lug.

This allows the disconnect switch to also act as a string combiner in systems that utilize two strings of PV modules per inverter. The 600VDC 60-amp 3-pole safety switches are UL Listed to handle 38A at 600VDC per pole. All other Square-D 600 VDC disconnects are rated for disconnecting one string at full rated power.

Many utilities require an AC disconnect between a grid-tie inverter and the AC load center, close to the AC service entrance, with a visible and lockable handle. A 30-amp 240-volt disconnect is good for up to 5kW at 240VAC and the 60-amp disconnect is good for up to 11kW. For connection of multiple inverters to one of these disconnects, use an AC load center, with a circuit breaker for each inverter installed, as an AC combiner box between the inverters and the disconnect switch. The breakers can be back-fed with the inverter outputs and the load center main lugs will handle the combined outputs to be connected to the AC disconnect.