OSCAL 3600 SE: 3.423kWh AC capacity test

These figures summarize readings reported in the source video and apply to the tested setup and conditions.

What does the “95%” result mean? The OSCAL PowerMax 3600 SE delivered 3.423kWh of AC energy in the TATFT discharge test, against its 3.6kWh rated battery capacity. That is about 95.1% usable AC energy relative to the rating. It does not isolate inverter conversion efficiency: the available test does not measure DC energy entering the inverter.

Disclosure: Oscal sent this unit for testing. All opinions and test results are my own.

Model and test boundary

The tested unit is the PowerMax 3600 SE, with a stated 3,600Wh LiFePO4 battery and 3,600W AC output rating. It is distinct from the PowerMax 6000. The SE unit's expansion ports are not functional; do not infer expansion support from the shared case.

The test starts at displayed 100% charge, with an AC energy meter reset. The presenter describes a load just below a 0.2C equivalent, about 720W. The transcript identifies a power meter, but does not establish its model, calibration or measurement uncertainty.

Result	Type and interpretation	Evidence
3.423kWh AC delivered	Measured AC energy in this discharge test	Watch the source video / Watch the source video
3.6kWh battery	Rated capacity, not measured DC input	Label and manual discussed at Watch the source video
3.423 ÷ 3.6 = 95.1%	Calculated AC-to-rated-capacity ratio	Includes the overall usable-energy boundary
100% to 90% in 12 hours	Observed state-of-charge display change with inverter enabled	Watch the source video

Idle draw: watts and watt-hours

Using the display's 10-point charge drop as an estimate of 10% of rated capacity gives 0.10 × 3,600Wh = 360Wh over 12 hours. Dividing by time gives an estimated 30W average idle draw, or about 30Wh of energy per hour. “30W per hour” was the wrong unit for this result.

The charge display is not a calibrated energy meter. A five-day empty-battery projection assumes constant drain and a linear relationship between percentage and energy; it was not a five-day endurance measurement.

What the result cannot establish

This single-unit test does not establish the same result at every load, temperature, battery age or charge cutoff. It is not a matched laboratory comparison with EcoFlow, despite the original video's title. Do not infer a general brand ranking, complete cycle life, circuit suitability or safety certification from the readings. Check current manuals and the exact revision before planning a backup system.

Sources and related gear

Watch the original TATFT OSCAL test. See the PowerMax 3600 SE gear entry, power-station video library and the Elite 300 load example.