Step5: Battery Bank Sizing

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 For Step 5 in our solar power system sizing series, we will be sizing the battery bank needed to support the system based on the previously determined parameters and assuming a 48-volt system with a Depth of Discharge (DOD) of 90%

parameters Recap:

1. Daily Energy Consumption: 20.75 kWh

2. Total Peak Power: 3430 W

3. Days of Autonomy: 2 days

4. Solar Hour:4 hours

5. Calculated Solar Array Value: 6.48 kW

6. Number of Solar Modules: 22 pieces of 300W modules


Step 5: Sizing the Battery Bank

Formula:

Battery Capacity (Ah)} = Daily Energy Consumption (kWh) x Days of Autonomy/(System Voltage (V)} x DOD)

Calculations:

- Daily Energy Consumption: 20.75 kWh

- Days of Autonomy: 2 days

- System Voltage: 48 V

- Depth of Discharge (DOD): 90% (0.9)


Battery Capacity = 20.75 x 2/48 x 0.9


Let's calculate the required battery capacity in Ampere-hours (Ah)


The required battery capacity for the system is approximately 960.65 Ah

Sizing Summary:

1. Daily Energy Consumption: 20.75 kWh

2. Total Peak Power:3430 W

3. Days of Autonomy: 2 days

4. Solar Hour: 4 hours

5. Calculated Solar Array Value: 6.48 kW

6. Number of Solar Modules: 22 pieces of 300W modules

7. Battery Bank Size: Approximately 960.65 Ah at 48V (with 90% DOD).

The implication is that you would need 5 pieces of 10KW lithium ion battery to achieve this two Days Autonomy of such an energy consumption.


This setup ensures that the solar power system can support the energy requirements with a 2-day autonomy period, leveraging a 48-volts system and optimizing battery usage with a 90% Depth of Discharge.

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