Selecting the right battery capacity is one of the most important decisions when building a solar-plus-storage system. A well-sized battery ensures optimal energy utilization, cost efficiency, and long-term performance. Here are three key points to consider.

1. Understand Your Daily Energy Consumption
Start by analyzing your household’s average daily energy usage. A smaller home might need only a 10–15 kWh system, while larger households with heavy appliance loads could require 20–30 kWh or more. Monitoring your past electricity bills is the easiest way to estimate this figure.

2. Consider Your Solar System Size and Power Generation
Your solar array’s capacity directly impacts how much energy can be stored. Ideally, your battery should be large enough to capture excess daytime solar power but not oversized, as unused capacity adds unnecessary cost. Striking a balance between solar output and storage capacity is key to efficiency.

3. Evaluate Your Backup Needs
If energy security is a priority—such as during power outages or grid instability—select a battery that can support critical loads for several hours or even days. Advanced lithium systems now feature modular expansion options, allowing flexibility as your energy needs grow.

At Origotek Co., Ltd., we provide tailored battery solutions for both residential and commercial applications, helping customers maximize system performance and achieve real energy independence.