Micro Inverters + Envoy
Enphase is a system that uses micro-inverters that were first introduced in June 2008. These micro-inverters are tucked under each panel and they convert the DC electricity to AC electricity. Besides the micro-inverters, the system has the Envoy system which is essentially its brain. Envoy will gather all the data from the micro-inverters and will deliver it to Enlighten software. Also, Envoy will report any issue related to how the micro-inverters are performing and will deliver updates.
Solar Edge Inverter
SolarEdge has a solar panel optimizer that is attached to each panel which are all connected to one inverter. That means that if one of the panels is in shade, the rest of the modules are unaffected. The same is true for Enphase, but the difference is that SolarEdge sends the DC solar power to one inverter. In comparison, Enphase's micro-inverters convert the DC to AC immediately at the roof.
What happens if SolarEdge inverter or Enphase micro-inverter malfunctions?
Enphase and Solaredge dominate the high-end residential inverters market in the United States. Although both offer a technology that isolates the performance and enables the monitoring of each individual panel, their modes of failure are quite different.
SolarEdge failure mode:
As mentioned above, a SolarEdge system is composed of optimizers; one optimizer per solar panel, and a string inverter that centralizes the DC currents from the optimizers and converts it into an AC current. Most of the failures we noticed in SolarEdge installations happen at the inverter level which means that the entire system will cease to produce power until the inverter is fixed or replaced.
Of course, if the inverter is under warranty, this doesn't mean that you are out of luck. NuWatt Energy will make the necessary steps to get the problem fixed for our clients - provided that the inverter is still under manufacturer warranty.
Enphase Micro-inverters failure mode:
Micro-inverters are installed for each panel and are non-centralized. This is an advantage over centralized or string inverters such as SMA, Fronius, or inverters with optimizers such as SolarEdge. If one micro-inverter malfunctions, the other micro-inverters will keep producing power.
Enphase warranties the micro-inverters for 25 years. If any repair is required, your inverter will be replaced at no additional cost to our clients by our technicians.
Scalability - Enphase vs. SolarEdge
SolarEdge's scalability is limited in comparison to Enphase micro-inverters. SolarEdge systems are limited to the size of the central inverter, which can intake a certain number of solar panels. Enphase micro-inverters have higher flexibility to scale by simply adding solar panels with compatible micro-inverters.
Scalability matters to clients who project an increase in their future power demand in case of adding an electric vehicle, or add a large battery backup system for example. Theoretically, you can add an unlimited number of panels (some modifications may be required of course) when you have a micro-inverter system but you may have to change the central inverter if you want to increase the number of solar panels.