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Dr.Prepare PowerMax 2-in-1 Runtime Calculator
Use this source-linked record to estimate runtime from tracked capacity, output, charging, and weight fields. Unknown specs stay unknown until an official or manufacturer-grade source confirms them.
Quick answer: the Dr.Prepare PowerMax 2-in-1 stores 1,280 Wh. Its continuous AC rating is not confirmed by a usable source, so this record keeps the field unknown rather than guessing — check the sources below before planning AC loads. Last source check: 2026-08-27. This is an estimate, not a guarantee.
Capacity1280 Wh
AC outputunknown
Surgeunknown
ChemistryLiFePO4
ConfidenceEstimated
Source regionglobal/general
Checked2026-08-27
Swipe table sideways
| Battery capacity | 1280 Wh |
|---|---|
| Battery chemistry | LiFePO4 |
| AC output | unknown |
| Surge output | unknown |
| DC output | unknown |
| USB-C output | unknown |
| Solar input | 100 W |
| Weight | unknown |
| Confidence | Estimated |
| Lifecycle status | Unknown |
| Source region | global/general |
| Last verified | 2026-08-27 |
The PowerMax is a 2-in-1 design: a 12V 100Ah LiFePO4 deep-cycle battery paired with an output hub, so it has no built-in AC inverter and AC output stays unknown rather than being recorded as zero. Treat it as a DC power station: runtime maths against 12V loads is sound, but mains appliances need a separate inverter.
Runtime Starting Points
These are formula estimates using the tracked capacity, a 10% reserve, and each scenario's default wattage and duty cycle. They are planning starters, not measured runtimes.
Swipe table sideways
| Scenario | Default load | Estimate | Scenario confidence | Station page |
|---|---|---|---|---|
| Full-size refrigerator | 500 W at 33% | AC output unknown | Estimated | Use calculator |
| CPAP without heated humidifier | 40 W at 100% | AC output unknown | Estimated | Use calculator |
| Starlink Mini | 32 W at 100% | AC output unknown | Estimated | Use calculator |
| Wi-Fi router | 12 W at 100% | AC output unknown | Estimated | Use calculator |
| LED TV | 100 W at 100% | AC output unknown | Estimated | Use calculator |
Calculator for this station
Adjust watts, duty cycle, reserve, output path, and startup surge with Dr.Prepare PowerMax 2-in-1 prefilled from the source-linked specs above.
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Power station model
Battery capacity (Wh): 1280 WhContinuous output rating (W): n/aSurge output rating (W): n/a
Estimated runtime16h 19m10h 13m – 20h 16mEstimated runtime: 16h 19m, 10h 13m – 20h 16m
Output path
Estimated runtime
16h 19mEstimated runtime: 16h 19mThis setup has comfortable headroom for overnight use, assuming the wattage estimate is realistic.
Conservative10h 13m
Estimated16h 19m
Optimistic20h 16m
Conservative assumes harder conditions; optimistic assumes favorable conditions.
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior.
- The selected station output rating is unknown, so running-load compatibility is not verified.
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
- Rated battery
- 1280 Wh
- Usable energy
- 979 Wh
- 1280 Wh x 85% x 90% x 100% x 100%
- Running watts
- 60 W
- Average load
- 60 W
- Max surge
- n/a
- Fixed station overhead
- Unknown (not included)
- 60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
- Estimated runtime
- 16h 19m
- 979 Wh / 60 W = 16h 19m
- Output path
- AC inverter
- Efficiency (%)
- 85
- Reserve kept unused (%)
- 10
- Battery health (%)
- 100
- Cold weather loss (%)
- 0
This link contains the numeric values you entered, but not custom load names.
Source-Backed Next Steps
Smallest matching record (8h)Jackery Explorer 600 Plus
WattRunTime.com
WattRunTime estimate
Estimated runtime
16h 19mThis setup has comfortable headroom for overnight use, assuming the wattage estimate is realistic.Usable energy979 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a
Runtime range
Conservative10h 13m
Estimated16h 19m
Optimistic20h 16m
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
Usable energy979 Wh1280 Wh x 85% x 90% x 100% x 100%
Fixed station overheadUnknown (not included)60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
Estimated runtime16h 19m979 Wh / 60 W = 16h 19m
Assumptions
- 1280 Wh nominal battery capacity
- AC inverter output path
- 85% conversion efficiency
- 10% reserve kept unused
- 60 W average load from 1 load
- 100% battery health
- 0% temperature loss
- Fixed station overhead unknown; not included
Warnings
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior.
- The selected station output rating is unknown, so running-load compatibility is not verified.
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Good fit when
- Capacity is in a mid-size planning class that can cover many overnight or essential-load scenarios when reserve and efficiency are included.
- AC output is unknown in the current source record, so do not assume it can run AC appliances.
- Tracked solar input is 100 W before panel, weather, angle, and controller losses.
Watch out for
- Surge output is unknown, so do not assume compressor, pump, or power-tool startup will work.
- Still unknown in the source-backed record: ac output, surge output, dc output, usb-c output, weight.
- Weight is unknown, so portability should not be inferred from this model page yet.
- Confidence is not marked verified; keep the linked source context visible before making a purchase or emergency plan.
Sources
- Dr.Prepare official PowerMax product page (official; checked 2026-08-27)