Solar Export Control Zero Export in India – 2026 Guide

What the Solar Export Control Zero Export Guidance Covers

Zero export may be required or preferred in specific C&I projects depending on DISCOM interconnection conditions, state regulations, open‑access restrictions, net‑metering eligibility, transformer capacity, or client operating requirements. EPCs should verify the project‑specific requirement with the DISCOM or relevant state authority.

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 examples of implementation 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.

Product examples should be treated only as implementation examples, not regulatory requirements. Do not present Solis, Deye, Eastron or any firmware version as mandatory for compliance. EPCs should select inverters, meters and controllers that meet the DISCOM-approved zero-export control method and the project’s response-time/tolerance requirements.

Certification and documentation steps

1. Select a certified inverter that lists zero‑export capability; examples include 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. Perform commissioning tests required by the DISCOM or project approval conditions and document export-control performance within the specified tolerance. Do not claim continuous 0 W export unless the approval conditions and hardware capability support that exact requirement.

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 smart meters that support dual‑address configuration (e.g., examples include Eastron 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 within the allowed tolerance 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 dual smart 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 within the allowed tolerance 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

Battery sizing for zero export depends on project‑specific assumptions about load profile, PV generation, desired discharge duration, losses, and tariff objectives; illustrative scenarios should be developed case‑by‑case with appropriate assumptions.

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?

In practice, zero export means the control system limits power exported to the grid to within the tolerance and response time accepted by the DISCOM/utility and project approval conditions.

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?

Penalty, curtailment, interconnection, and exemption treatment depends on the applicable state regulation and DISCOM approval conditions.

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?

Penalty, curtailment, interconnection, and exemption treatment depends on the applicable state regulation and DISCOM approval conditions.

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.