System Types

Zero-Export

Zero-export is a system configuration where the solar inverter is actively prevented from sending any electricity to the utility grid. The inverter monitors grid power flow in real time and throttles solar production down to match instantaneous household consumption exactly, ensuring net export never exceeds zero watts.

This configuration is required in some jurisdictions where utilities do not allow grid export from solar systems, or where interconnection agreements prohibit feeding power back to the grid. It is also used in some commercial and industrial settings where the utility's export regulations are restrictive or where export tariffs are unfavorable.

Zero-export is implemented using a current transformer (CT) clamp on the main grid feed line that reports real-time power flow to the inverter. When the inverter detects that solar production is about to exceed consumption, it curtails output to match the load. If consumption drops to 500W and solar capacity is 5,000W, the inverter throttles down to 500W, wasting the remaining 4,500W of available solar capacity.

This curtailment is the major drawback of zero-export. Without battery storage, any potential production above instantaneous consumption is lost. Adding batteries to a zero-export system captures this excess, storing it for later use instead of discarding it. A zero-export system with adequate battery storage can achieve very high self-consumption rates.

Some hybrid inverters offer zero-export mode as a configurable setting, making it easy to comply with utility requirements while still maximizing on-site solar utilization through battery storage and load shifting. This is becoming increasingly common in markets transitioning away from net metering.

Frequently Asked Questions

Why would a utility prohibit grid export?

Utilities may restrict export due to grid stability concerns (too much distributed solar can cause voltage fluctuations on local circuits), limitations in their metering infrastructure, or regulatory frameworks that do not accommodate distributed generation. This is more common in developing markets and rural utility service areas.

Is zero-export wasteful?

Without batteries, yes — solar capacity above instantaneous consumption is curtailed and lost. With battery storage, zero-export systems capture excess production for later use, minimizing waste. The key is pairing zero-export mode with adequate battery storage to absorb the solar production that would otherwise be curtailed.