aPS LogoAn alternative to the Enphase micro inverter units we commonly see in the valley are the dual units made by APS.

The most common is the APS YC500-A which has an output of 500w max and has two inputs for panels,each panel having a power range of 180 to 310w.(These are functionally equivalent to two Enphase M250 units in one case). There is now also a quad unit, the YC-1000,  taking input from 4 panels.

APS 500

APS maintain a technical library at https://usa.apsystems.com/resources/library/ where manuals and details of their products can be found.

Here are some downloads as .pdf documents.

The YC500-EU-SAA is the latest technology microinverter from APsystems (formerly APS) and is designed to connect to two solar modules. By installing one inverter per 2 modules the number of devices and connections required per installation are halved and the overall cost of the system reduced. The YC500 is compatible with most 60 and 72 cell solar modules. Up to 9 YC500’s (18 solar modules) can be installed on a single 25A circuit.

The YC500 provides individual module maximum power point tracking and is very easy and quick to install. If a system has an odd number of solar modules, one or more YC250’s can be installed in conjunction with the YC500s as they are fully compatible with each other and with the Energy Control Unit (ECU).

An APsystems installation consists of:

  • APsystems microinverter
  • APsystems Energy Communication Unit (ECU)
  • APsystems Energy Monitor and Analysis (EMU) web-based monitoring and analysis unit

YC-500 Sample layout


Screenshot from the APS ECU monitoring system

APS Screenshot

Live data from a site in Vancouver can be viewed at: Vancouver Cohousing APS dashboard.

Additional installation components from APsystems

  • AC branch end cable (1 per branch, sold separately – P/N: AC Cable – F)
  • Protective end cap (1 per branch, sold separately – P/N: End Cap – F)
  • AC Extension Connector Cable (if required – P/N: AC – EXT)
    – Available in 1m, 2m, and 4m lengths.