Tool-Battery Power Stations Need Pack-Count Math

Some jobsite power stations are really inverters for removable tool batteries. Their output can be source-backed, but runtime depends on the exact packs installed.

Core concept

Do not compare tool-battery inverters by one fixed Wh number unless the pack set is defined.

Planning impact

Running watts and starting watts can be sourced separately from runtime capacity.

What to verify

Pack count, pack voltage/Ah, battery age, output path, and load watts decide the estimate.

Pack energy Wh = pack voltage x amp-hours x number of packs; usable Wh still needs efficiency, reserve, health, and temperature.

Tool-Battery Power Stations Need Pack-Count Math

Some jobsite power stations are really inverters for removable tool batteries. Their output can be source-backed, but runtime depends on the exact packs installed.

Capacity Is Not One Model Number

A tool-battery power station can ship tool-only, with a kit pack set, or with user-selected packs. That is why the same inverter can have different Wh available.

Output Specs Still Matter

Continuous and starting watts are useful compatibility checks. Keep them separate from runtime, because a strong inverter can still have short runtime with small packs.

Why The Finder Excludes Them

The model finder expects one source-backed batteryCapacityWh value. Tool-battery platforms need a separate pack-count model so unknown capacity does not become a fake number.

Source-Backed Tool-Battery Platforms

These records are tracked separately until the calculator has a first-class pack-count model.

Swipe table sideways

Source-Backed Tool-Battery Platforms
Platform	Battery system	Output	Source	Finder status
EGO POWER+ Nexus PST3042	EGO POWER+ Nexus PST3042 uses EGO 56V ARC Lithium; capacity varies with the installed pack set.	2,000 W running / 3,000 W starting.	Official source	Excluded from the fixed-Wh finder until pack-count capacity can be modeled explicitly.
RYOBI 40V 1800W Power Station RYi1802BT	RYOBI 40V 1800W Power Station RYi1802BT uses RYOBI 40V; capacity varies with the installed pack set.	1,600 W running / 3,000 W starting.	Official source	Excluded from the fixed-Wh finder until pack-count capacity can be modeled explicitly.
DEWALT DCB1800B	DEWALT DCB1800B uses DEWALT 20V MAX / FLEXVOLT; capacity varies with the installed pack set.	1,800 W running / 3,600 W starting.	Official source	Excluded from the fixed-Wh finder until pack-count capacity can be modeled explicitly.
Milwaukee MX FUEL CARRY-ON MXF002-2XC	Milwaukee MX FUEL CARRY-ON MXF002-2XC uses Milwaukee MX FUEL; capacity varies with the installed pack set.	1,800 W running / 3,600 W starting.	Official source	Excluded from the fixed-Wh finder until pack-count capacity can be modeled explicitly.
Milwaukee M18 CARRY-ON 2845-20	Milwaukee M18 CARRY-ON 2845-20 uses Milwaukee M18; capacity varies with the installed pack set.	1,800 W running / 3,600 W starting.	Official source	Excluded from the fixed-Wh finder until pack-count capacity can be modeled explicitly.

Evidence and review

These sources support the definitions and planning method. Calculator results are still estimates, not measurements or guarantees.

Engineering review: July 16, 2026
Primary sources: 2

EGO POWER+ Nexus Portable Power Station product pageEGO POWER+ · Manufacturer specification — Open source
RYOBI 40V 1800W Power Station RYi1802BT product pageRYOBI · Manufacturer specification — Open source

Estimate With The Pack Set

Use the battery runtime calculator once you know the installed pack voltage, amp-hours, pack count, and output path.

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Power station model

Battery capacity (Wh): 1024 WhContinuous output rating (W): 1800 WSurge output rating (W): 2700 W

Estimated runtime13h 3m8h 10m – 16h 13m

Battery capacity (Wh)

Device wattage (W)

Device startup surge (W)

Output path

Efficiency (%)Reserve kept unused (%)Duty cycle (%)Battery health (%)

Estimated runtime

13h 3m

This setup has comfortable headroom for overnight use, assuming the wattage estimate is realistic.

Conservative8h 10m

Estimated13h 3m

Optimistic16h 13m

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.

Show your work

Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.

Rated battery: 1024 Wh
Usable energy: 783 Wh; 1024 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: 13h 3m; 783 Wh / 60 W = 13h 3m
Output path: AC inverter
Efficiency (%): 85
Reserve kept unused (%): 10
Battery health (%): 100
Cold weather loss (%): 0

Shareable report link

This link contains the numeric values you entered, but not custom load names.

Source-Backed Next Steps

Need a size class?Open the size finder

Unsure about watts?Open the wattage chart

Charging with solar?Estimate solar offset

Smallest matching record (8h)Jackery Explorer 600 v2

Estimated runtime

13h 3mThis setup has comfortable headroom for overnight use, assuming the wattage estimate is realistic.

Usable energy783 Wh

Average load60 W

Fixed station overheadUnknown (not included)

Running watts60 W

Max surgen/a

Runtime range

Conservative8h 10m

Estimated13h 3m

Optimistic16h 13m

Show your work

Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.

Usable energy783 Wh1024 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 runtime13h 3m783 Wh / 60 W = 13h 3m

Assumptions

1024 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.

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Use With These Tools

Related Guides

Portable Power Station Runtime Calculator

Apply this guide's assumptions in the runtime calculator.

Battery Runtime Calculator

Turn battery capacity and voltage into a usable-energy plan.

Emergency Backup Calculator

Combine critical loads, reserve, and duration in one outage plan.

Surge Watt Calculator

Check continuous load and startup demand as separate limits.

Portable Power Station Size Finder

Turn the required runtime into a capacity target with margin.

Appliance Wattage Library

Choose a source-linked running load before estimating runtime.

Capacity guide

Usable Capacity vs Rated Capacity

A 1,000 Wh label is the starting point, not a promise that 1,000 Wh reaches your device.

Efficiency guide

Inverter Efficiency Losses

AC is convenient, but the inverter changes battery energy into wall-style power and some energy is lost as heat.

Margin guide

Reserve and Battery Health

A runtime plan is safer when it leaves margin for age, cold, changing load, and measurement error.

FAQ

Plan EGO, DEWALT, Milwaukee, and similar tool-battery power supplies without pretending they have one fixed Wh rating.

Why are these not normal model-finder records?

The fixed model finder needs one battery Wh value. Tool-battery platforms change capacity with the installed packs, so publishing one Wh number would be misleading.

Can I still estimate runtime?

Yes. First calculate the pack energy from voltage, amp-hours, and pack count, then apply efficiency, reserve, health, temperature, and load watts in the calculator.