How to calculate the battery capacity of solar panels
发布日期：How to calculate the battery capacity of solar panels
1. Determine the battery capacity according to the electricity consumption needs, Time (hours) = battery voltage (V) * battery capacity (AH) * 80% * 70% / power (W). In the formula for calculating battery power time, 80% means that the battery can only use 80% of the power. After photovoltaic, the battery life is shortened by 80%, and the efficiency of the inverter is about 70%. 2. Solar panel design, the output voltage of solar energy for 12V battery charging is 18V. According to the calculation of 9 hours of sunshine per day, search the local annual sunshine days on the Internet to determine the charging current. Charging current = battery capacity*80%*130%*150%/9, 3. When charging, the battery converts electrical energy into chemical energy with a conversion efficiency of about 50%. 4. When discharging, the battery can only discharge 80% of its power. Over-discharge will shorten the battery's life, and the battery's over-discharge will shorten its life by 80%. 5. The average efficiency of the charger is about 70%.