Energy Management Fundamentals
An Energy Management System (EMS) optimizes the flow of power between solar generation, battery storage, grid connection, and loads. It makes real-time decisions to minimize energy costs while ensuring reliability.
Core Optimization Strategies
Self-Consumption Maximization
Store excess solar in batteries during daytime, discharge at night. Typical for residential and commercial systems with net metering limitations.
Time-of-Use (TOU) Arbitrage
Charge batteries during off-peak (low rate), discharge during on-peak (high rate). Requires accurate rate schedule and load forecasting.
Peak Shaving
Limit grid import to a fixed threshold. When load exceeds threshold, battery discharges the difference. Reduces demand charges for C&I customers.
Solar-Diesel Hybrid
Prioritize solar + battery, start generator only as last resort. Can achieve 60-80% fuel savings vs diesel-only. Critical for remote telecom and mining sites.
Load Prioritization
Category loads: Critical (life safety, telecom) → Essential (refrigeration, lighting) → Non-essential (HVAC, pool pump). Shed non-essential first during deficits.