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Rooftop Commercial Project - SolarEdge P680 Optimizer vs SolarEdge P730 or P850 Optimizer

Why should I use a SolarEdge P860 optimizer on a rooftop commercial project instead of a P730 or P850 optimizer?



The primary difference is that the P730 and P850 only offer a single input for two modules which therefore must be connected in series.

P730 / P850

Optimizer Model 

(Typical Module Compatibility)

P730 

(for 2x high power 72-cell PV modules)

P850 

(for 2x higher power or bi-facial modules)

Rated Input DC Power

730W

850W

Connection Method

Single input for series connected modules


Assuming we are under the 2017 NEC, “controlled conductors located inside the boundary… shall be limited to not more than 80 volts within 30 seconds of rapid shutdown initiation.” However, since our modules are connected in series, the combined voltage (Voc) coming out of the modules will, in most cases, exceed the allowed 80 volts.

SolarEdge’s solution is the P860, which features dual inputs for independently connected modules. Connection in this manner is compliant with 2017 NEC requirements and circumvents the issue seen with the P730 and P850 series optimizers. If your jurisdiction is still under 2014 NEC requirements, you may still be able to use the P730 or P850 – always check with your AHJ/utility before proceeding.


P860

Optimizer Model 

(Typical Module Compatibility)

P860 

(for 2x 72-cell modules)

Rated Input DC Power

860W

Connection Method

Dual  input for independently connected modules