1. Battery Capacity:
Battery capacity, measured in watt-hours (Wh), determines how long a portable power station can supply power to your devices. For example, a 300Wh power station can theoretically power a 30W device for 10 hours.
Selection Tip: If you only need to charge small devices like smartphones and cameras, a power station around 300Wh should be sufficient. However, for higher-powered devices like electric cookers, kettles, or car refrigerators, or if you need extended outdoor use, consider a product with a capacity of 1000Wh or more.
2. Output Power:
Rated Power: This is the continuous power the station can provide. Ensure the total power of connected devices does not exceed the station’s rated power, and leave a 20% margin to prevent overloading. For example, to run a 1000W kettle, opt for a station with at least 1200W rated power.
Peak Power: Peak power is the maximum power output the station can provide for a short time, useful for devices with a motor or other inductive loads. Check both the duration of peak power and the device's instantaneous power needs.
3. Output Ports:
Port Types: Common output ports include AC (alternating current) for devices like laptops and fans, and DC (direct current) ports such as car chargers, USB, and Type-C for phones and tablets.
Number of Ports: The more ports a station has, the more devices it can charge simultaneously. Choose a power station with the right type and number of ports based on your needs.
4. Battery Type:
NMC (Nickel Manganese Cobalt): These batteries have a higher energy density, meaning more capacity for a given size, and they perform well in low temperatures. However, they are less safe, potentially posing a fire risk when punctured.
LiFePO4 (Lithium Iron Phosphate): These batteries offer better thermal stability, longevity, and safety but have lower energy density, resulting in a bulkier, heavier unit for the same capacity.
5. Charging Speed:
Charging speed is crucial for frequent users. Typical 1000Wh power stations take 6-9 hours to recharge, but fast-charging models with smart inverter technology can be fully charged in as little as 1.5-2 hours.
6. Durability:
Durability refers to the number of charge cycles a battery can go through while maintaining at least 80% of its capacity. NMC batteries last for around 500-800 cycles, while LiFePO4 batteries can last for 2000 or more cycles.
7. Protection Features:
A quality portable power station should have multiple protection features such as overcurrent, overcharge, over-discharge, short-circuit, overpower, and overheating protection, ensuring safe use.
8. Output Waveform:
Most power stations provide one of three AC output waveforms: sine wave, modified sine wave, or square wave. Pure sine wave is the best choice, as it closely mimics household electricity and is compatible with most devices. Modified sine wave or square wave outputs may damage sensitive electronics.