Solar Export Control Zero Export in India – 2026 Guide

What the Solar Export Control Zero Export Guidance Covers

India’s grid‑integration guidance encourages “zero export” for certain commercial‑and‑industrial (C &I) solar installations that include on‑site storage. The goal is to stabilise local distribution networks and promote self‑consumption. The guidance applies to systems that:

• Use hybrid or AC‑coupled inverters capable of export limitation.
• Have dual smart meters that can relay real‑time export data to the inverter controller.

Eligibility and Process for Zero‑Export Projects

Eligible inverter technologies

• Hybrid inverters – Solis hybrid models (S5‑EH1P, S6‑EH1P, S6‑EH3P) are supported for dual‑meter setups, though current Solis documentation notes that zero‑export (0 W) is not yet feasible because the inverter does not communicate with an existing PV inverter.
• AC‑coupled inverters – Deye’s PCS series includes zero‑export control via its touchscreen interface and can be programmed for time‑of‑use scheduling.

Both families must be paired with Eastron smart meters that support dual‑address configurations.

Certification and documentation steps

1. Select a certified inverter that lists zero‑export capability (e.g., Deye PCS).
2. Install dual smart meters (one for generation, one for export) and set slave addresses 01 and 02 as described in the Solis guide.
3. Configure inverter firmware to enable the zero‑export mode (for Deye) or the closest export‑limiting setting available.
4. Record a 24‑hour export test with the battery fully charged and verify that the export reading on the export‑meter remains 0 W.

What EPCs Must Do to Comply

System Design

• Model export scenarios using hourly solar irradiance data for the project location.
• Size battery storage to capture a high proportion of daily surplus (typical Indian C &I load profiles suggest ≈ 80 % capture).

Installation

• Use Eastron meters that support dual‑address configuration (e.g., EM340 firmware 1.12.3 or later).
• Ensure inverter firmware is up to date; Deye’s PCS firmware v2.3 adds a “Zero‑Export Auto‑Curtail” feature.

Testing & Commissioning

• Perform a 24‑hour export test with the battery fully charged; confirm that export reads 0 W on the export‑meter.
• Document the test results for internal audit purposes.

Documentation

• Keep PDF copies of inverter data sheets, meter calibration certificates, and test logs in the project repository for future reference.

Practical tip: Automate the compliance checklist within your project‑management software; Reslink’s proposal workflow can flag missing zero‑export items before final sign‑off.

Recent Changes and Emerging Solutions

New inverter capabilities (2025‑2026)

• Deye’s PCS platform now offers a “Zero‑Export Scheduler” that can be programmed for time‑of‑use constraints, aligning with upcoming tariff revisions.
• Solis hybrid inverters continue to support dual‑meter configurations, though full zero‑export control remains unavailable without additional communication logic.

Market impact

• EPCs adopting zero‑export solutions can reduce equipment redundancy by using hybrid units instead of separate battery inverters (industry estimate).
• Battery vendors are seeing demand for high‑efficiency (> 98 %) units to meet tighter self‑consumption targets.

Action Checklist – What EPCs Must Do Now

• Verify inverter zero‑export support – check model specifications before tendering.
• Procure Eastron dual meters – ensure firmware is current for dual‑address operation.
• Run export‑zero simulations – use software tools to size battery capacity to capture a high share of surplus.
• Configure firmware – enable the zero‑export mode and lock export limit at 0 W where possible.
• Document test results – retain inverter settings, meter configuration screenshots, and 24‑hour export logs for audit purposes.

Supporting Information

Battery Sizing for Zero Export

A typical 1 MW rooftop PV system in Delhi generates about 5 MWh per day. To approach zero export, storage capacity around 4 MWh (≈ 80 % of surplus) is commonly recommended based on load‑profile guidance.

Smart Meter Configuration Details

• Eastron EM340 supports RS485 communication and can be set to slave address 01/02 via the LCD menu.
• Firmware 1.12.3 or later is required for dual‑meter synchronization.
• Verify communication by reading meter registers through the inverter’s Modbus interface before commissioning.

Reporting Timeline (internal)

Quarterly internal compliance checks are advisable to ensure ongoing adherence to zero‑export settings.

Frequently Asked Questions

Q1. What does “zero export” mean in practice?

It means the PV‑plus‑storage system is configured so that export power to the grid is limited to 0 W continuously, using inverter settings and smart‑meter feedback.

Q2. Which inverter models currently support true zero‑export control?

Deye’s PCS series provides built‑in zero‑export control. Solis hybrid models support dual‑meter setups but do not yet offer full zero‑export capability.

Q3. Can a standard grid‑tied inverter be retrofitted for zero export?

Retrofit is possible only if the inverter firmware can be upgraded to include export limiting and the system adds a compatible smart meter. Many legacy grid‑tied inverters lack this capability.

Q4. How large should the battery be for a 1.5 MW rooftop to meet zero‑export goals?

A storage capacity of roughly 2.4 MWh (≈ 80 % of expected surplus) is often sufficient for typical Indian commercial load profiles.

Q5. What documentation is required for internal compliance?

Maintain inverter data sheets confirming zero‑export capability, dual‑meter calibration certificates, and a 24‑hour export‑zero test report in the project’s document repository.

Q6. Are there penalties for occasional export spikes?

Regulatory penalty details are not publicly specified in the available guidance; EPCs should consult the latest CEA directives for exact terms.

Q7. Will future tariff reforms impact zero‑export practice?

Upcoming time‑of‑use tariff revisions are expected to increase the economic incentive for self‑consumption, reinforcing the value of zero‑export configurations.

Q8. How frequently must the zero‑export system be re‑certified?

Internal audits are recommended on a quarterly basis to verify that firmware settings and meter readings remain within zero‑export limits.

Q9. Are exemptions from zero‑export possible for critical facilities?

The guidance allows limited exemptions for critical loads (e.g., hospitals, data centres) pending a variance request and approval.

Sources

• Solis AC‑Couple Application Guide – details hybrid inverter models, dual‑meter requirements, and current export‑limit capabilities.
• Deye Zero‑Export PCS Launch – outlines zero‑export control features and firmware updates.
• Deye Intersolar Europe announcement – describes zero‑export scheduling and efficiency figures.