PV Generation with Microinverters

Microinverters are installed behind each solar module and convert the DC power from solar modules to grid-compliant AC power right at the module. Use our data sheets and design resources below to help you design your system. For more information about Enphase Microinverters, visit the Microinverter Family page of our website.

Selecting the Right Microinverter

To determine the compatibility of specific PV modules with Enphase Microinverters, use our Module Compatibility Calculator.

Review specifications and design resources for each of our Microinverters below.

Array Sizing

To determine how many microinverters you'll need simply divide the desired AC system size by the nameplate rating of the compatible microinverter. For example, if you're designing a 7.56kW AC system using the S270 Microinverter, divide 7,560 by 270 to arrive at 28 microinverters. (7,560 / 270 = 28)

AC Branch Circuits

The maximum number of microinverters that can be installed on each AC branch circuit can be found in a microinverter's datasheet. Continuing the example from above, the maximum number of S270 single-phase microinverters that can be installed on a 20A circuit is 14. This means that you'll need two branch circuits for this 7.56kW sample system. (28 / 14 = 2)

System Compatibility

If creating a system with a Enphase AC Battery expansion in mind for the future, it should be noted that a Envoy-S Metered is required.

If creating a system with zero-export capabilities in mind, it should be noted that an Envoy-S Metered gateway must be paired with S-Series Microinverters. Other string systems paired with the Envoy-S Metered gateway are incapable of doing zero export.

Commercial Support

Enphase provides customer service, training and engineering staff to assist deployment of Enphase products in the APAC region.

When installing grid connected solar in a commercial application within Australia, installations must be signed off by a CEC Accredited Designer and installer. Both the designer of the system and installer must be trained to specify, and install, Enphase products.

Interconnection rules and regulations for commercial sized solar installations (typically for systems greater than 15kVA in capacity), can be stringent.

Commercial size systems present extra challenges such as:

1. Single Line Drawings
2. Site Layout Drawings
3. DNSP Network Connection requirements (e.g export limiting, power factor, phase balancing, grid protection settings), normally referenced as Embedded Generation on the relevant DNSP websites.
4. Secondary Protection Systems (Network Protection)
5. DNSP Interconnection and testing Approval
6. Injection Testing
7. Multiple Points of connection
8. Commissioning documentation

Enphase engineering can review design drawings and provide guidance where required.   However, Enphase recommendations using an experienced solar engineering service to design and specify commercial projects where the Accredited Designer and Installer may not have the experience or technical expertise. Enphase staff do not design systems and are not a substitute engineering service. Speak to your account manager about how Enphase can help with your next commercial project.

Communications and Control with Envoy