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Dr.Prepare PowerMax 2-in-1 Runtime Calculator
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.
Battery capacity1,280 Wh
AC outputunknown
Surge outputunknown
Battery chemistryLiFePO4
ConfidenceEstimated
Source regionGlobal/general sources
checked2026-08-27
Swipe table sideways
| Battery capacity | 1,280 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 sources |
| Last verified | 2026-08-27 |
Catalog notes (original English)
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 estimate
Formula starting points use each scenario’s default watts, duty cycle and output path, with 10% reserve or 15% for CPAP. Linked detail pages use the same inputs. Hours apply only if the device can run and start; they are not measured runtimes.
Swipe table sideways
| Device scenario | Planning default | Estimated runtime | Device scenario: Confidence | Models |
|---|---|---|---|---|
| Full-size refrigerator | 500 W · 33% · AC inverter · Reserve: 10% | 5h 56m Output or startup compatibility is not established | Estimated | Calculator |
| CPAP without heated humidifier | 40 W · 100% · AC inverter · Reserve: 15% | 23h 7m Output or startup compatibility is not established | Estimated | Calculator |
| Starlink Mini | 32 W · 100% · USB-C PD · Reserve: 10% | 1d 9h Output or startup compatibility is not established | Estimated | Calculator |
| Wi-Fi router | 12 W · 100% · AC inverter · Reserve: 10% | 3d 12h Output or startup compatibility is not established | Estimated | Calculator |
| LED TV | 100 W · 100% · AC inverter · Reserve: 10% | 9h 48m Output or startup compatibility is not established | Estimated | Calculator |
Runtime calculator
Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
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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
Output or startup compatibility is not established
This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
16h 19mEstimated runtime: 16h 19mOutput or startup compatibility is not established
Conservative10h 13m
Estimated16h 19m
Optimistic20h 16m
These are calculated sensitivity cases, not a statistical confidence interval. Conservative uses lower efficiency and battery health, more reserve/temperature loss and higher load; optimistic changes these assumptions in the opposite direction.
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
- Output or startup compatibility is not established
- 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 19mOutput or startup compatibility is not establishedUsable 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. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
- Output or startup compatibility is not established
- The selected station output rating is unknown, so running-load compatibility is not verified.
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Planning notes
- Capacity class: 1,280 Wh. Size the battery for your measured average load and required hours, including reserve.
- Tracked output: unknown. Compare both running demand and startup demand before using any runtime estimate.
- Solar input limit: 100 W. Actual refill depends on panel voltage/current compatibility, sunlight, angle and charging losses.
Known data gaps
- Unverified or missing specifications remain visible. The confidence label describes the station record, not a tested runtime or approval for emergency use.
- Weight: unknown. Check the complete carrying setup, cables and battery extensions before choosing this model for travel.
- unknown: AC output, Surge output, DC output, USB-C output, Weight
Sources
- Dr.Prepare official PowerMax product page (Official; checked 2026-08-27)