Residential energy storage systems are a new type of hybrid system that combines traditional grid-connected photovoltaic (PV) power generation systems with lithium-ion batteries for energy storage. It consists of batteries, hybrid inverters, and PV panels. The following describes common types and characteristics of residential PV + energy storage systems.
1. Hybrid residential photovoltaic + energy storage system
A hybrid photovoltaic (PV) + energy storage system typically consists of PV modules, lithium batteries, a hybrid inverter, a smart meter, a current transformer (CT), a power grid, grid-connected loads, and off-grid loads. This system can directly charge the battery via DC-DC conversion from PV modules, or it can perform bidirectional DC-AC conversion for both charging and discharging the battery.
2. Coupled Residential Photovoltaic + Energy Storage System
Coupled photovoltaic (PV) + energy storage system, also known as AC-to-AC PV + energy storage system, typically consists of PV modules, a grid-connected inverter, lithium batteries, an AC-coupled energy storage inverter, smart meters, current transformers (CTs), the power grid, grid-connected loads, and off-grid loads. This system allows PV power to be converted to AC by the grid-connected inverter, and then excess power is converted to DC by the AC-coupled energy storage inverter and stored in the batteries.
3. Off-grid residential photovoltaic + energy storage system
Off-grid residential photovoltaic (PV) + energy storage systems typically consist of PV modules, lithium batteries, an off-grid energy storage inverter, loads, and a diesel generator. This system can directly charge the battery via DC-DC conversion from PV modules, or it can perform bidirectional DC-AC conversion for both charging and discharging the battery.
4. Photovoltaic energy storage management system
A photovoltaic energy storage management system typically consists of photovoltaic modules, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, current transformers (CTs), the power grid, and a control system. This control system can receive and respond to external commands, meet the system's power demand, accept real-time control and scheduling, and participate in the optimized operation of the power grid, making energy use more efficient and economical.
