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1200W Microinverter With or Without Zero Export: Which One Should You Choose?
Two microinverters can share a 1200W output rating and still serve different project requirements. The key question is how the installation should manage solar power when generation is greater than the electricity being used on site.
The comparison at a glance
NBQ1200-EU: a 1200W grid-tied microinverter for projects designed around the site's permitted grid arrangement.
NBQ1200-EU-FNL: a 1200W model marketed with export-control functionality. Confirm the required sensing, controller and accessories for the actual installation.
What Happens to Extra Solar Power?
A grid-connected microinverter converts the panels' DC output into AC power for the connected installation. When solar production is lower than site demand, the grid supplies the difference. When production exceeds the load, surplus power may flow toward the grid unless an appropriate export-control arrangement limits it.
Whether export is allowed, limited or requires approval depends on the site's grid connection and applicable local requirements. Ask the installer or network operator about those conditions before choosing a configuration.
How Export Control Changes the Decision
An export-control system uses information about power flow at the relevant metering point to adjust generation toward a configured export limit. A current transformer (CT) or another compatible meter may be used in such a system; the exact hardware, placement and settings depend on the product configuration and site design.
When available solar power exceeds the permitted output, the controller may reduce inverter production. That reduction is called curtailment: energy the panels could otherwise produce is not generated. A zero-export setting is a control target; actual performance depends on measurement, response, wiring, configuration and changing loads.
A Simple Daytime Example
Imagine the panels could deliver 900W while the site's steady demand is 400W. In a simplified system without active export limiting, approximately 500W of surplus could flow toward the grid if the connection permits it. A correctly configured zero-export controller would seek to reduce generation toward the site's demand. If the demand later rises to 700W, the controller may allow more production, within the available solar power and configured settings. These figures illustrate the principle; actual flows and response depend on losses, other loads, metering and the installed control system.
Meet the Two 1200W Models
The NBQ1200-EU is listed as a dual-MPPT, grid-tied 1200W microinverter. It is a starting point for a project whose approved design permits the relevant export arrangement. If export limiting is required, check with SUKFLOW and the installer whether an external control solution is supported for the particular unit.
The NBQ1200-EU-FNL is the export-control model. It is relevant when the project calls for a configured limit on power flowing toward the grid. Its control design and performance must be checked against the project's actual wiring, load pattern and grid requirements.
Side-by-Side Selection Guide
| Item | NBQ1200-EU | NBQ1200-EU-FNL |
|---|---|---|
| Maximum continuous AC output | 1200W | 1200W |
| PV inputs and tracking | Two inputs; dual MPPT | Two inputs; dual MPPT |
| Export-control positioning | Standard grid-tied listing; verify support for any required external control | Listed with export control; verify the complete control configuration |
| Installation decision | Check permitted export, approvals and grid requirements | Check export limit, metering, response and commissioning requirements |
The table uses the two product listings as a selection overview. Confirm current specifications and the complete bill of materials for the exact model before purchase.
Export Control and Anti-Islanding: Two Different Functions
Export control manages power flow while the system is operating with the grid. Anti-islanding protection responds to loss of the grid so a grid-tied inverter does not continue energising the utility connection in an unintended island. They address different conditions; the presence of one function does not establish the details of the other.
These products are presented as grid-tied microinverters. Do not assume either model will supply household backup power during a utility outage. If backup is a project requirement, discuss a suitable independently supported system architecture with a qualified installer.
Four Questions Before You Choose
- What export limit, connection approval and commissioning evidence does the local grid operator require?
- How much electricity does the site use during solar generation hours, and how quickly do its loads change?
- Are the panel voltage, current, connectors and layout compatible with the exact inverter model and its current documentation?
- Which sensing, control and communication components are included or needed, and who will install and verify them?
Both options provide a 1200W reference point. Start with the site's approved export conditions, then verify the control hardware and panel compatibility needed to meet them.
View NBQ1200-EU View NBQ1200-EU-FNL Contact SUKFLOW