Use an inverter to build a doomsday shelter

As war breaks out in many parts of the world, we gradually realize the insignificance and helplessness of human beings. In order to ensure that they will not be displaced due to war in the future, more and more people are choosing to build their own underground shelters. Of course, this is not difficult. The construction of a shelter is no different from building an ordinary basement. However, considering the energy shortage problem once the war breaks out, everyone has chosen to build an off-grid solar power supply system to ensure that even in the After losing power from the grid, there can still be continuous power supply. In order to design a solar-based shelter power system that can meet the survival needs of 3 people for a month, we need to consider the following key factors:

• Power demand assessment
• Components of solar system
• Equipment selection
• Safety measures and maintenance

1. Electricity demand assessment

First, we need to assess the daily power needs of the equipment within the shelter. A hypothetical device list might include:

• LED light
• small refrigerator
• Cell phone and radio charging
• Simple kitchen appliances (such as induction cookers)
• Water pumps and water purification systems
• air purification system
• Heating or cooling equipment (depending on climate conditions)

We assume that the daily power consumption is about 3kWh (this is a rough estimate, the specific value needs to be calculated based on the actual equipment).

Of course, the above are only some emergency devices that require electricity. Others, including food and water, need to be prepared. If you are considering the long term, you also need a device to collect rainwater. Of course, if there is a river near the shelter, you can also You can consider taking water from rivers, but this may also be dangerous in the event of war.

2. Composition of solar system

Solar-based power systems mainly include solar panels, solar charge controllers, inverters and batteries.

3. Equipment selection

Solar panels

Capacity selection: Assuming an average of 5 hours of effective light time per day, at least 0.6kW of solar panels is required (3kWh / 5h = 0.6kW). Considering the efficiency loss and unstable weather conditions, it is recommended to install 1kW solar panels.

solar charge controller

Type selection: Choose an MPPT (Maximum Power Point Tracking) charge controller compatible with solar panels and batteries to improve charging efficiency.

Power Inverter

Capacity selection: Choose an inverter that can at least meet the maximum load power. If the total demand is 3kWh, consider an inverter with an output capability of at least 1.5-2kW, taking into account possible instantaneous high loads. Considering that users may have other electrical appliances that may need to be used, I recommend purchasing a 2000 watt power inverter as an inverter of choice.

battery

Capacity calculation: To ensure that the shelter can continue to operate for at least two days without sunlight, 6kWh of energy storage is required (3kWh x 2 days). Considering battery deep discharge (DoD) and efficiency, it is recommended to choose a battery pack with a capacity of at least 12kWh.

4. Security Measures and Maintenance

Protective devices: Install necessary protective devices such as circuit breakers and fuses to prevent overload or short circuit.

System monitoring: Install system monitoring equipment to monitor solar power generation, battery status and power consumption in real time.

Regular inspections: Regularly check the cleanliness of the solar panels, whether the connecting wires are secure, and whether the batteries are working properly.

Implementation Overview

Purchase 1kW solar panels to ensure daily power needs are covered as well as additional reserves.

Choose the right MPPT charge controller to improve system efficiency.

Purchase a 1.5-2kW inverter to ensure it can meet the needs of all equipment.

Configure a battery pack with a capacity of at least 12kWh to ensure power supply for at least two days under no light conditions.

Install and configure necessary security and monitoring equipment.

Please note that the above calculations are based on estimates and general guidelines. In actual operation, it is recommended to evaluate the specific power needs in detail and consult professionals for system design and installation to ensure safety and efficiency.

Finally, I wish all of us civilians can survive in the turbulent world and survive all disasters safely.