Strategies for calculating daily energy consumption off-grid?

Understanding Your Energy Demand

To accurately calculate your daily energy consumption, you need to know the energy usage of each appliance in your off-grid system. Start by making a list of all appliances you plan to power, including lights, refrigerators, water pumps, and computers. Look up the wattage rating for each appliance, and multiply this by the number of hours you expect to use it per day. For example, a 100-watt light bulb used for 8 hours a day would consume 800 Wh (100 watts x 8 hours). A 200-watt refrigerator used for 24 hours a day would consume 4,800 Wh (200 watts x 24 hours).

Estimating Energy Storage Capacity

Once you have calculated your total daily energy consumption, you need to determine how much energy storage capacity you need to store excess energy generated by your solar panels. A good rule of thumb is to have at least 2-3 days of energy storage capacity to account for periods of low sunlight. For example, if your daily energy consumption is 10 kWh, you would need a battery bank with a capacity of at least 20-30 kWh (10 kWh x 2-3 days).

Sizing Your Solar Panel Array

With your daily energy consumption and energy storage capacity determined, you can now size your solar panel array. A general rule of thumb is to oversize your solar panel array by 20-30% to account for periods of low sunlight and energy storage losses. For example, if your daily energy consumption is 10 kWh and you need a battery bank with a capacity of 20 kWh, you would need a solar panel array that generates at least 15 kW of electricity per hour (10 kWh + 20% oversize).