From room to roof: How feasible is direct coupling of solar-battery power unit under variable irradiance?

摘要: Abstract Integration of photovoltaics (PV) with electrical energy storage (battery) is a straightforward approach to turn intermittent power source into stable supply. Power coupling, or matching, between PV-device, battery, and load most frequently performed aid maximum point tracking (MPPT) electronics. MPPT electronics provides high flexibility as for PV impedances, irradiance, however, it brings in additional cost, complexity, overhead, potential reliability issues, interference signals. On the other hand, direct coupling via preselection battery parameters simple scalable highly efficient alternative specific set conditions. We explore modeling how far directly coupled PV-battery unit can stay power-matched under various conditions, demonstrate feasibility excellent matching over orders magnitude irradiance wide range resistances. Both PV-harvester an office room low non-demanding load, autonomy, PV-system on roof demanding partial operate efficiently without if appropriate included. This result emphasizes role impedance element besides functionality matched PV-system.