Evaluation of a Grid-Connected Residential Hybrid PV-BESS Under Iran's Regulatory Framework (Tavanir & SATBA): Load Supply During Outages and Techno-Economic Performance

Frequent grid load shedding during summer months in Iran has increased the demand for continuous electricity supply in households. This study presents a techno-economic evaluation of a residential hybrid Photovoltaic-Battery Energy Storage System (PV-BESS) operating under the Tavanir and SATBA regulatory frameworks. A case study was conducted on a typical single-phase subscriber utilizing a ۳ kW PV array integrated with a ۶ kW all-in-one hybrid system equipped with a ۵ kWh battery. The economic assessment, based on the Net Present Value (NPV) method, calculates revenue from surplus energy sold to the grid, thereby excluding the energy self-consumed during outages. Results show payback periods of ۱۰.۱۸ and ۱۲.۵۸ years at discount rates of ۲۵% and ۳۰%, respectively. While these periods may appear lengthy, the load supply evaluation demonstrates that the system covers the average household consumption during ۳-hour outages year-round, and even meets the entire average daily consumption in most months. Furthermore, in a worst-case scenario operating at maximum contracted demand, the PV-BESS can sustain power for up to ۲ hours. Ultimately, SATBA's guaranteed power purchase program acts as a supportive financial mechanism, allowing users to gradually recover their capital investment while securing uninterrupted power availability.

کلیدواژه ها:

Hybrid PV-BESS (Photovoltaic-Battery Energy Storage System) ، Net Present Value ، Load shedding ، Guaranteed electricity sales