How to reuse an old solar panel
ElectronicsBuildingRecycled
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The components we have
A 300 kWp PV module, a controller and a battery are left over and unused after the renovation of the yellow van. How can we reuse it?
What we have:
PV module:
Power: 300 Wp
Energy: 300 kWh/y (Assumption: 1kWp -> 1000 kWh/y)
Battery
Voltage = 12 V
Capacity = 150 Ah
Capacity = 12 * 150 / 1000 = 1,8 kWh
Controller:
Voltage: Auto 12/24V
Charge Discharge Current: 30 A
Power: 24 V + 30 A = 720 W
The power is limited to 300 W by the PV module. Without sun and PV production, a maximum of 1.8 kWh of stored energy can be used from the battery.
In the following posts we will present two options we like. We look forward to your ideas as comments under this post. We try to use second hand equipment as much as possible.
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Idea: Freezer for ice cream
Description: A freezer can be used to make ice cubes for cocktails or vegan ice cream during the hot summer days.
What we need: Freezer with low electrical power, inverter, shed for freezer
What we found second hand:
Inverter:
Power: 1500 W
Freezer:
Annual energy = 168 kWh/y
Power estimation start up = 300 - 800 W
Power estimation active cooling= 100 - 300 W
Source: https://www.bluettipower.com
Conclusion:
The solar controller and the inverter are adequately sized for the PV module. The annual energy production of the PV module should cover the annual consumption of the freezer. However, the power usage profile of the freezer is uncertain. Older freezers might have a higher startup power requirement than the PV module can provide. The battery might cover the underproduction since cooling machines usually do not operate continuously. For more in-depth research, the power consumption of the freezer will be measured in an upcoming experiment.
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