How we can find the size of a storage battery for a hybrid system?
You can use the software Homer. The Legacy version is free. See in www.homerenergy.com.
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Battery bank sizing can be one of the more complex and important calculations in your system design. If the battery bank is oversized, you risk not being able to keep it fully charged; if the battery bank is sized too small, you won't be able to run your intended loads for as long as you'd planned.
written by Chris Brown
Many renewable energy (RE) systems incorporate batteries. Batteries can be used in all types of systems including:
Photovoltaic or solar panels
Wind Power Systems using Wind Turbines
Hydroelectric generators
Hybrid Renewable Energy Ststems
Other DCpower sources
The energy stored in the batteries can then be used directly to power DC loads or it can be inverted to power AC loads. The batteries recommended for RE systems are deep cycle batteries. To ensure you have enough reserve capacity to provide the electricity you need (without running additional generators), invest the time to size your battery bank properly. Because of the various conditions affecting battery bank sizing, this process may be one of the more challenging calculations you’ll have to do when planning your RE system.
Before tackling the calculations, start by identifying a few key pieces of information:
Watt Hours of electricity usage per day
Number of Days of Autonomy
Depth of Discharge limit
Ambient temperature at battery bank
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