Assessment of Grid-connected Residential PV-Battery Systems in Sweden - A Techno-economic Perspective

Abstract

Ensuring a secure supply of electricity without harming climate is a key challenge for future power system and many renewables-based cutting-edge technologies are introduced to overcome this challenge. This paper aims to study the grid-connected residential PV-battery system at behind-the-meter scenarios in Sweden from a technical and economic perspective. The system is designed with PV arrays, inverters, Lithium-ion or lead-acid batteries. The optimal PV, lithium-ion and lead-acid battery size are determined at two locations (Arlanda and Karlstad) in Sweden based on the highest value of Net Present Value (NPV), Profitability Index (PI), the lowest value of Levelized cost of energy (LCOE) and payback period considering system losses, electricity market price, cost and PV incentives and a comparison is performed between these two locations against some techno-economic performance metrics for two combinations of PV-battery systems. Then, the best-case energy profile, bill savings, battery performance are also investigated. Finally, the system is simulated using System Advisory Model (SAM), a renewable analysis software from NREL, USA, and is found that the grid-connected PV with lithium-ion battery system is feasible and more economical considering available PV incentives in Sweden.