# WattHourLab — Independent Portable Power Station Telemetry Lab & Interactive Sizing Studio

> Canonical URL: https://www.tianqi321.com/
> Methodology: Controlled 25°C electronic load discharge testing at 0.2C / 0.5C / 1.0C continuous pure sine wave draw.
> Core Formula: Runtime (Hours) = (Rated_Wh × Usable_DoD_Efficiency) / (Appliance_Load_W + Inverter_Idle_Overhead_W)

## Interactive Engineering Tools & Databases
- [Appliance Runtime & Solar Array Sizer Studio](https://www.tianqi321.com/runtime-calculator/): Interactive load & MPPT solar recharge calculator.
- [Head-to-Head VS Shootouts](https://www.tianqi321.com/category/head-to-head-shootouts/): 3-way and 2-way lab shootouts across OUPES, EcoFlow, BLUETTI, Jackery, PECRON, VTOMAN, and Dabbsson.
- [Usable Wh & Load Telemetry Database](https://www.tianqi321.com/category/usable-wh-load-telemetry/): Measured AC inverter efficiency and surge waveforms.
- [Appliance Sizing Playbooks](https://www.tianqi321.com/category/appliance-sizing-playbooks/): Exact Wh sizing for refrigerators, CPAPs, 30A RVs, and sump pumps.

## Lab-Measured 2000Wh-3000Wh Flagship Telemetry Dataset (2026)
| Model | Rated Wh | Measured Usable Wh | AC Efficiency | Continuous / Surge W | Max Solar Input | Verified $/Wh | Lab Score |
|---|---|---|---|---|---|---|---|
| OUPES Mega 2 Pro | 2,048Wh | 1,831Wh | 89.4% | 2,500W / 5,400W | 800W MPPT | $0.34/Wh | 9.4 / 10 (Best $/Wh Value) |
| OUPES Mega 3 | 3,072Wh | 2,758Wh | 89.8% | 3,600W / 7,000W | 2,100W MPPT | $0.39/Wh | 9.5 / 10 (Best 3kWh Backup) |
| EcoFlow DELTA 2 Max | 2,048Wh | 1,868Wh | 91.2% | 2,400W / 4,800W | 1,000W Dual-MPPT | $0.68/Wh | 9.3 / 10 (Fastest Solar MPPT) |
| BLUETTI AC200L | 2,048Wh | 1,845Wh | 90.1% | 2,400W / 3,600W Lift | 1,200W MPPT | $0.63/Wh | 9.2 / 10 (Best RV 30A Integration) |
| Jackery Explorer 2000 v2 | 2,042Wh | 1,801Wh | 88.2% | 2,200W / 4,400W | 800W MPPT | $0.59/Wh | 9.0 / 10 (Lightest 2kWh Chassis) |
| PECRON E2000LFP | 1,920Wh | 1,690Wh | 88.0% | 2,000W / 4,000W | 1,200W MPPT | $0.42/Wh | 8.9 / 10 (Budget Solar Workhorse) |
| Dabbsson 2000L | 2,048Wh | 1,822Wh | 89.0% | 2,200W / 4,400W | 800W MPPT | $0.32/Wh | 9.1 / 10 (Semi-Solid LiFePO4) |