Reviewed by: Fortune Vast Engineering Team
Last updated: October 10, 2026
Models covered: MK-A-300-192 (300W Rated Power / 192Wh Capacity)
1. Assumptions and Limitations
This technical guide is designed to help B2B distributors and retailers explain runtime calculations to end-users. The calculations below assume a standard inverter conversion efficiency of 85%. Actual runtime will vary depending on the ambient temperature, battery degradation over time, and the specific power fluctuations of the connected appliances.
2. Understanding Rated Power (W) vs. Battery Capacity (Wh)
When selecting a portable energy storage supply, buyers often confuse power and capacity.
Rated Power (300W): Determines what devices you can plug in. Devices requiring more than 300W continuously will trigger the overload protection.
Battery Capacity (192Wh / 60000mAh): Determines how long those devices will run. Our MK-A-300-192 model uses a 12.8V 15AH lithium battery pack providing 192 Watt-hours of total energy.
3. Runtime Calculation Example
To accurately estimate how long a portable power station can run an appliance, use the following engineering formula: Runtime (Hours) = (Battery Capacity × Conversion Efficiency) / Device Power.
Test Data Source / Equipment Specs:
- Power Station: Fortune Vast MK-A-300-192
- Total Capacity: 192Wh
- Inverter Efficiency: ~85% (0.85)
- Target Appliances: Laptop (60W) and Drone Battery Charger (40W)
Calculation Examples:
- Charging a 60W Laptop: (192Wh × 0.85) / 60W = ~2.72 Hours of continuous operation.
- Charging a 40W Drone: (192Wh × 0.85) / 40W = ~4.08 Hours of continuous charging.
- Running a 15W LED Light: (192Wh × 0.85) / 15W = ~10.8 Hours.
Note: This 300W unit is highly suitable for drones, mobile phones, computers, fans, and LED lights. It is NOT suitable for heavy heating elements like microwaves, hair dryers, or kettles exceeding 300W.
4. Recharging Modes and Efficiency
The MK-A-300-192 supports dual charging modes for off-grid flexibility:
- Solar Panel Charging: Supports up to 15V 5A solar input. Under optimal direct sunlight, a compatible 75W solar panel can significantly extend outdoor operation time.
- AC Wall Charger (市电): Utilizes a 14.6V 3A AC adapter for reliable indoor recharging before deployment.
5. Multi-Port Output Capabilities
For versatile connectivity without additional adapters, the MK-A-300-192 integrates:
- AC Output: 2× AC 220V Universal Sockets (50/60Hz switchable) for standard electronics.
- USB & Type-C: 2× USB 3.0 ports and 1× Type-C port for fast-charging digital devices.
- DC Output: 2× 12V 5A DC ports.
- Emergency Lighting: Built-in 3W LED light for off-grid illumination.
6. Related Resources and Evidence Links
For procurement managers evaluating portable power stations for wholesale, please review our complete data: