System Types

Self-Consumption

Self-consumption is the practice of using solar-generated electricity directly in your home at the time it is produced, rather than exporting it to the grid. The self-consumption rate measures what percentage of your total solar production you consume on-site versus what percentage you export. Maximizing self-consumption is increasingly important as net metering export credits decline in many markets.

A typical grid-tied system without batteries achieves 25-40% self-consumption — most solar is produced during midday when many households are at work, so the majority gets exported. Adding battery storage dramatically increases self-consumption to 60-90% by storing midday excess for evening and nighttime use.

Strategies to maximize self-consumption include running high-energy appliances during peak solar hours (dishwashers, laundry, water heaters, EV chargers during midday), installing a battery to time-shift production, using smart home automation to align loads with solar output, and installing a hot water diverter that sends excess solar energy to your water heater instead of the grid.

Self-consumption has different economics than net metering. Under net metering, exporting solar earns credits at retail rates, so self-consumption and export are equally valuable. Under reduced export-credit programs, self-consumed solar avoids buying electricity at retail rates while exports only earn a fraction. In these markets, every additional kilowatt-hour you self-consume instead of export saves significantly more money.

As export credit programs tighten globally, self-consumption optimization is becoming the primary financial strategy for solar system owners. Battery storage, smart load management, and EV charging integration are the key tools for pushing self-consumption rates above 70-80%.

Frequently Asked Questions

How do I calculate my self-consumption rate?

Divide the solar energy you use directly on-site by the total solar energy your system produces. If your panels generate 30 kWh in a day and you use 12 kWh of it directly (exporting 18 kWh), your self-consumption rate is 40%. Battery storage captures that exported portion, potentially pushing self-consumption above 80%.

Is self-consumption more important than system size?

In markets with good net metering, system size matters most — produce as much as possible and let credits offset your bill. In markets with low or no export credits, self-consumption rate matters more because exported energy has little value. Design your system and battery to match your consumption pattern, not just your roof capacity.