How do I test a portable power station's real capacity?

Charge it fully, run a steady load well inside its rated output through a plug-in power meter until the unit shuts off, and read the watt-hours on the meter. Compare that with the claimed capacity and the manufacturer's usable-capacity figure for that load. A gap is normal because the inverter and fans use energy too. Repeat after each firmware update to compare.

What should I record when a power station cuts out?

Photograph the display straight away, before you touch anything, with the time stamped in. Note the load and its watts, the battery percentage, the temperature, the charging source and what the unit or app said, and how often it happens, not just the one time. If the unit is hot, smells or swells, stop and contact the manufacturer.

Can BetaSuite measure a power station's output?

Not directly. BetaSuite doesn't connect to a power station. On Android, its charge-port diagnostics log the voltage, current and wattage your phone's own charge port reports while it charges, so plugging the phone into the unit's USB-C port shows roughly what that port delivers to that phone. It doesn't read the unit's battery or AC outlets, and iPhone and iPad don't expose those readings at all. Use a plug-in power meter for the unit itself.

Is it safe to test switchover with real equipment?

Only with equipment that is safe to lose power. Use a lamp or a router, never medical or life-support equipment, follow the manual for how the unit switches over, and be ready for the load to restart.

Can I use BetaSuite for a power station under NDA?

Yes. Everything is stored on your device with no account. Confidential Mode blocks cloud AI and cloud uploads, and warns you before you share or export anything. Captures still save to your camera roll by default, so if your photos back up to the cloud, turn Camera Roll off in Settings → Save Destinations before you turn Confidential Mode on. Check your NDA first for what you may photograph and what you may send, and by what route.

Is BetaSuite a TestFlight alternative?

No. BetaSuite: Tester's Toolkit is not an app-beta tool and has no connection to TestFlight or Google Play testing tracks. It is for people who beta test physical products in the field and need timestamped evidence and a report for the manufacturer.

Is BetaSuite a subscription?

No. It is a one-time purchase from the App Store or Google Play, with no subscription, no ads and no account. Each store sets the price.

How to beta test a portable power station

To beta test a portable power station fairly, run the same measured tests each time (a capacity run to cut-off, charge times, a steady-load stability check and a switchover test), record the conditions every time and back every finding with a timestamped photo of the display and the meter. BetaSuite: Tester's Toolkit (betasuite.app) is an iPhone, iPad and Android app built for this: it burns the date and time into every photo and video and turns your sessions into a report for the manufacturer. It doesn't measure the power station itself, so the numbers come from the unit, its app and a plug-in power meter. The checklist below works with any tool, and there is a free 12-step protocol to import.

Updated 2 October 2026 · Written by Goodfield Studio, the maker of BetaSuite

What to test in a portable power station beta

A power station is mostly about numbers, so your evidence is mostly photos of displays and meters. Cover each area at least once, then repeat the ones that fail so you can say how often they fail. The same list works for a solar generator.

Area	What you are checking	Evidence worth capturing
Capacity vs claimed	The usable watt-hours you can actually draw at a set load, compared with the rated capacity and with what the manufacturer says about usable capacity. Use the fair capacity test below.	Photos of the display at 100%, the plug-in meter's watt-hour reading at shut-off, and the time.
Charge time	From a low level to full on AC with the supplied charger, then on solar and a 12 V car socket if the unit supports them. The input watts, and how well they hold over the charge.	Stamped photos of the display at the start and end, with the time visible.
Output stability	Steady output and no dropouts, flicker or overload trips on the AC, USB-A, USB-C and DC outputs under a steady load, and behaviour near the rated limit only as far as the manual allows.	A clip of the display and the load together.
USB-C and fast charging	Whether the USB-C ports deliver the power your devices expect and hold it, with your own cables.	A photo of the display and the device charging. On Android you can also log your phone's charge-port readings (see below).
Pass-through charging	Charging the unit and powering a load at the same time. Does it work, does it overheat, does it drop the output or change mode?	A photo of the display showing input and output, and any warning.
UPS or EPS switchover	What happens to a load when mains power is removed: no reset or flicker, and a switching time within what the manufacturer states, if it states one. Use only equipment that is safe to lose power.	A dual recording of the unit and the app, or a clip of the load.
Fan noise and heat	Fan behaviour at idle, at a typical load and during fast charging, the noise at normal distance, and how warm the case gets.	Notes of the distance and the load, a short clip with sound, and the temperature if the display shows it.
Standby drain	How much charge it loses overnight or over several days with the outputs off, and with them on and no load.	Photos of the battery percentage at the start and end, with the time visible.
Protections	Overload, over-temperature and low-battery cut-off behaviour. Only the checks the manufacturer tells you to do, and never try to defeat a protection.	A clip of any alert and the display.
App and display accuracy	Pairing, whether the app's battery and watt figures match the unit's display and a plug-in meter, remote switching, schedules, firmware updates and dropped connections.	A screen recording, or a dual recording of the app and the display together.
Cold, heat and weather	Use within the temperature range in the manual. Some units limit charging in the cold, so check the manual. Never expose it to rain beyond its rating.	Stamped photos with the temperature or weather visible.

Safety first. A power station stores a lot of energy, and its AC outlets carry mains voltage. Never open the case or modify the unit. Use the supplied cables or ones the manufacturer approves, don't go over the rated input or output limits, keep the vents clear and the unit dry, and stand it on a hard, non-flammable surface away from anything flammable. Don't charge or run it in direct sun or a hot car. A solar panel produces voltage whenever it is lit, so connect it only as the manual describes. If the unit swells, smells, hisses, smokes or gets unusually hot, stop using it, unplug it if you can do that safely, keep it away from anything flammable and contact the manufacturer straight away. Never test switchover with medical or life-support equipment.

A fair capacity test

A claimed capacity is a number on a box. What you can draw depends on the load, the temperature and the energy the inverter and fans use. This test gives you a figure you can repeat, so you can compare firmware versions and see how far the unit is from its claim. It is a relative test, not a lab result.

Charge fully with the supplied charger. Note the date, the time and the display at 100%.
Put a plug-in AC power meter that shows watt-hours between the unit and a steady load that is well inside the unit's rated output (for example a lamp).
Note the watts the meter shows and the output watts on the display. Keep the room temperature as steady as you can, and don't change the load part-way through.
Run it until the unit shuts off by itself. Don't try to push it past its own cut-off. Record the total watt-hours on the meter and the run time.
Work out the result: usable % = watt-hours delivered ÷ claimed capacity × 100. Some gap is normal because the inverter and fans use energy, so ask the manufacturer what load and temperature their usable-capacity figure assumes.
Recharge it and time the charge from shut-off to 100%. If you put a second plug-in meter on the charger, the watt-hours in against the watt-hours out show how much energy was lost.
Repeat at a different load and temperature, and after every firmware update, and log each run as a new row in the same log.

Logging the USB-C output into your phone (Android only)

On Android, BetaSuite's charge-port diagnostics show your phone's own voltage, current, wattage and battery temperature live, and can log them over time during a session (Advanced mode), with a chart in the report. If you charge the phone from the power station's USB-C port, that shows roughly how much power the port gets into that phone: whether charging holds steady, drops out, or settles at less power than you expected. The phone measures at its battery, not at the port, so the voltage shown is the battery's, and the wattage reads a little below what the port supplies.

Start a session in BetaSuite, plug your phone into the power station's USB-C port with the cable you want to test, and open Power Supply Test (in Tools or Settings), BetaSuite's charge-port diagnostics.
Tap Record to log readings to the active session, and keep the screen open. Logging pauses while BetaSuite is in the background, and stops when you leave the screen or the session ends.
Photograph the power station's display at the start and end, so the log and the unit's own figures line up in time.

What this is not: it doesn't read the power station's battery, inverter, AC outlets or total capacity, and it only shows what your phone's own charge port reports, so the readings depend on the phone's sensors and vary between phones. Use it to compare ports, cables and firmware versions, not as a calibrated measurement. On iPhone and iPad, iOS doesn't expose voltage, current or wattage to apps, so you only get the charging state and battery level. If you need exact numbers for any device, use a USB power meter.

Conditions to record every time

A fault you can't reproduce is just a story. Log the same details every time so engineers can line your problem up against everyone else's.

Record	Why it matters
Date, time and time zone	Engineers can match your report to the unit's own logs, if the manufacturer collects them.
Unit state	Battery percentage, firmware and app versions, which outputs are on, and any eco mode or charge limit you have set.
Load	What is plugged in, and the watts the meter and the display show. Say whether the load was steady or changed.
Temperature	Room or outdoor temperature, direct sun, and the case temperature if the display shows it. Heat changes fan noise, charging speed and cut-offs.
Placement and ventilation	Where the unit stood, the surface, and how much clear space it had around its vents.
Charging source	The AC charger, or the solar panel (model, rated watts, angle and how sunny it was), or the car socket (engine running or not).
Cables and meters	Which cables and which plug-in meter you used. Meters differ, so use the same one each time.
Changes	Anything different since the last test: new firmware, a new cable, a moved unit or a different load.

BetaSuite adds the date and time to every photo and video for you, and can add GPS, live weather, the season and the time zone, each of which you can turn on or off in Settings.

A pass/fail checklist for a portable power station

Agree your thresholds with the manufacturer's brief first. If it doesn't give any, write your own before you start (for example, "at least 80% of the claimed capacity at a 100 W load") so you aren't judging after the fact.

Powers on, the display shows the battery level and the input and output watts, and no warning appears.
Charges from AC to 100% and stops, in about the time the manufacturer states.
Charges from solar and from a car socket, if it supports them, at steady input watts in line with the manual.
Delivers the usable capacity in your brief at the agreed load.
Keeps its outputs on and steady under a constant load, with no dropouts or overload trips inside its rating.
USB-C ports deliver the power your devices expect, and hold it.
Pass-through charging works without overheating, resetting or switching the output off.
Switches over to battery with no reset or flicker on the test load.
Keeps its fans at a level you could live with, and the case doesn't get unusually hot.
The display and the app agree with each other and with a plug-in meter, closely enough for your brief.
Loses no more charge in standby than the threshold you set.
Installs a firmware update cleanly and keeps your settings.

A fail isn't a verdict on the unit. It's a finding. Write it up with the conditions and a photo.

How to capture evidence engineers can use

Photograph the display every time. The percentage, the input and output watts and any warning, with the time stamped in. A stamped photo beats a typed number.
Put the unit and the meter in one photo. That way the watt-hours on the meter and the figures on the display can be matched to the same moment.
Record the load. Photograph the label of whatever is plugged in, and the meter showing its watts, so the load is on record.
Put the app and the unit in one clip. Dual recording in BetaSuite records your phone's screen and the rear camera into a single video, so what the app says and what the display shows sit side by side on one timeline.
Film the switchover. A short clip of the load as you pull the mains plug, with the display in view, shows a flicker or reset better than a description.
Catch the intermittent faults. An output that cuts out is rarely doing it while you watch. With Instant Capture, BetaSuite keeps a rolling buffer and saves the last 15–30 seconds when you tap, so you can work near the unit and still catch the moment.
Mark it as it happens. Add a one-tap marker or a quick voice note with the time, then write it up properly later.
Burn the time into the picture. A stamp that is part of the image travels with the file. File metadata is often stripped when a photo is shared or compressed. BetaSuite stamps every photo and video, with optional GPS, weather, season and time zone. More on that in the timestamp camera app guide.
One issue per photo or clip. Name it by what happened ("AC output cut out at 34%"), not "IMG 214".

What to send the manufacturer

A good report is short at the top, specific in the middle and backed up at the bottom. See how to write a beta test report for the full structure.

Section	What goes in it
At a glance	Model and serial number, firmware and app versions, the claimed capacity and rated output, test dates, and the loads and chargers you used. Three sentences on how it went.
Findings, worst first	Safety issues first (heat, smell, swelling, electric shock risks, a protection that failed to act), then outputs that cut out or capacity well short of the claim, then annoyances. For each one: what happened, what you expected, how to repeat it (the load, the watts, the temperature), how often it happens and the conditions.
Test log	Your capacity runs and charge times in one table or CSV, so they can see the pattern behind the findings.
Evidence	Time-stamped photos and clips matched to each finding by name or time.
What worked	A short list. Engineers also need to know what not to change.
Data files	A CSV or JSON of your findings if they ask. BetaSuite reports can ship with both.

Here is the format for one finding. The values are made up, to show the shape.

Title:      AC output cuts out under a steady 600 W load
Severity:   High (the load loses power)
Expected:   Holds 600 W until the battery cut-off
Actual:     AC output switched off at 34% with an overload warning, back after a restart
Frequency:  2 of 3 runs, both with the fan running loudly
Conditions: 600 W steady load (unit rated 1,000 W), 24°C, firmware 1.0.8, supplied cable
Evidence:   Photo of the display and the meter, stamped 15:18:44

Want to see a finished report? Open the sample report (PDF). It has an At a Glance summary, findings sorted by severity and an image appendix.

Running it in BetaSuite

Create a project for the unit, and note the model, serial number, firmware and claimed capacity in your first session.
Import the free protocol below. It opens with a free-text step for those details.
Start a session each time you test. Capture the photos and clips the steps ask for, and drop a marker whenever something happens.
After a few runs, generate a PDF or Word report with an At a Glance summary and findings by severity, plus JSON and CSV data files if you want them.

AI summaries are optional and opt-in. For units under NDA, Confidential Mode blocks cloud AI and cloud uploads, and warns you before you share or export anything. Everything is stored on your device, with no account.

Free BetaSuite protocol: portable power station test

This is a ready-made, 12-step protocol for testing a portable power station or solar generator. It was built with the site's own Protocol Builder, so the link below is a real import link. It opens with a free-text step for the unit's details, mixes pass/fail checks with a choice, a multiple-choice and a rating question, and asks for a photo, video or dual recording where the evidence matters. The capacity test needs a plug-in AC power meter, and the solar and car charging step can be marked N/A if your unit doesn't support them. For the general idea, see the test protocol template.

Portable power station test · 12 steps · free to import and edit

Open this protocol

Before you start: record the model and serial number, firmware and app versions, the claimed capacity (Wh) and rated output (W), the starting battery percentage, the room temperature and where the unit is standing.Free text
Power-on: the unit starts from its own button, the display shows the battery percentage and the input and output watts, and no warning appears. Photo: the display.Pass / FailPhoto required
AC charging: from a low level with the supplied charger, the unit charges to 100% and stops, in about the time the manufacturer states, with no unusual heat, noise or smell. Note the start and finish times. Photo: the display at full.Pass / FailPhoto required
Solar or car charging: if the unit supports it, it charges from a solar panel or a 12 V car socket, and the input watts shown are steady and in line with the manual. Stay within the input limits in the manual. Mark N/A if your unit can't charge this way.Pass / Fail
Capacity test: from 100%, run a steady AC load through a plug-in power meter until the unit shuts off, and record the watt-hours delivered. The result meets the target in your brief, or the usable capacity the manufacturer gives for that load. Photo: the meter at the end.Pass / FailPhoto required
Output stability: under a steady load, the AC and USB outputs stay on with no dropouts, flicker or overload trips, and the display figures stay steady. On Android you can also log your phone's charge-port readings while it charges from a USB-C port. Video: the display and the load together.Pass / FailVideo required
Pass-through: while the unit is charging, it powers a load at the same time. The display shows both input and output, and the unit doesn't overheat, reset or switch the output off.Pass / Fail
Switchover: with a lamp or router running through the unit on mains power, unplug the mains. The load stays on with no reset or flicker. Use only equipment that is safe to lose power, never medical or life-support equipment. Record the unit and the app together.Pass / FailDual recording required
App: the companion app pairs, shows battery and input and output watts that match the unit's display, switches outputs on and off, and stays connected through a full discharge. Record the app and the display together.Pass / FailDual recording required
How loud were the fans at normal distance under a typical load?Options: Silent or barely audible · Noticeable but fine · Loud · Loud, with whine, rattle or pulsingChoice
Which problems did you see? Tick all that apply.Options: Output cut out or overload trip · Charged slower than claimed · Fan ran loud or constantly · Display or app showed wrong numbers · App disconnected · Got unusually hot · Error code or alarm · None of theseMultiple choice
How confident would you be relying on this unit to keep non-critical devices running in a power cut? 1 = not at all, 5 = completely.Rating (1–5)

Steps marked required show the tester a Start capture button for that photo, video or dual recording, and the capture is attached to the step's result. Answers roll up into the report: pass rates, ratings and every result grouped by question.

Show the raw code

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How to import it

On your phone, tap Open this protocol. If BetaSuite is installed, it opens its import sheet with the code filled in. If the link opens in your browser instead, tap Copy code there (or here).
In BetaSuite, open Test protocols, choose Import and paste the code or link.
Edit any step to suit your unit, then run it. Your answers are saved to a session and roll up into the report. Protocols, sessions and reports are part of Advanced mode; if you're in Basic mode, Test protocols offers to switch for you.

Want to change the steps first? Open the link in the free Protocol Builder. It runs in your browser with no account, and you can generate a fresh code from your edits. Running a whole beta programme? See how to give every tester the same protocol and merge the results.

When BetaSuite is the wrong choice

BetaSuite covers everything from a single stamped photo to a full report for the manufacturer. It is the wrong tool only when:

You need to measure the power station itself. BetaSuite doesn't connect to the unit, its battery or its outputs, so it can't read capacity, voltage, current or temperature from it. Use the display, the app and a plug-in power meter, and photograph what they show.
You need charge-port numbers on an iPhone. That logging is Android-only. iPhone and iPad show charging state and battery level only, because iOS doesn't expose those sensors to apps. Even on Android it logs your phone's own charge port, not the power station.
You want to log a long discharge unattended. A phone isn't a data logger. BetaSuite records the moments you start or save, and charge-port logging pauses when the app goes to the background. Use a meter or logger with its own memory for hours-long runs.
You need lab numbers or certification. Real capacity, efficiency, surge ratings and safety certification need proper equipment.
You want to test an app, not hardware. BetaSuite is not a TestFlight or Google Play testing tool. See what a hardware beta testing app needs to do.

Don't need a report? If the manufacturer takes findings through its own portal or form, or you only want stamped photos and video, switch BetaSuite to Basic mode (Settings > App mode). It keeps every capture tool, including dual recording and Instant Capture, and leaves out projects, sessions and reports, so it works as a plain timestamp camera. Attach the files wherever the manufacturer asks, and switch back to Advanced at any time without losing anything.

If you run the programme rather than test in it, see the programme page. For the longer case for the app, see why BetaSuite.

Frequently asked questions

How do I test a portable power station's real capacity?: Charge it fully, run a steady load well inside its rated output through a plug-in power meter until the unit shuts off, and read the watt-hours on the meter. Compare that with the claimed capacity and the manufacturer's usable-capacity figure for that load. A gap is normal because the inverter and fans use energy too. Repeat after each firmware update to compare.
What should I record when a power station cuts out?: Photograph the display straight away, before you touch anything, with the time stamped in. Note the load and its watts, the battery percentage, the temperature, the charging source and what the unit or app said, and how often it happens, not just the one time. If the unit is hot, smells or swells, stop and contact the manufacturer.
Can BetaSuite measure a power station's output?: Not directly. BetaSuite doesn't connect to a power station. On Android, its charge-port diagnostics log the voltage, current and wattage your phone's own charge port reports while it charges, so plugging the phone into the unit's USB-C port shows roughly what that port delivers to that phone. It doesn't read the unit's battery or AC outlets, and iPhone and iPad don't expose those readings at all. Use a plug-in power meter for the unit itself.
Is it safe to test switchover with real equipment?: Only with equipment that is safe to lose power. Use a lamp or a router, never medical or life-support equipment, follow the manual for how the unit switches over, and be ready for the load to restart.
Can I use BetaSuite for a power station under NDA?: Yes. Everything is stored on your device with no account. Confidential Mode blocks cloud AI and cloud uploads, and warns you before you share or export anything. Captures still save to your camera roll by default, so if your photos back up to the cloud, turn Camera Roll off in Settings → Save Destinations before you turn Confidential Mode on. Check your NDA first for what you may photograph and what you may send, and by what route.
Is BetaSuite a TestFlight alternative?: No. BetaSuite: Tester's Toolkit is not an app-beta tool and has no connection to TestFlight or Google Play testing tracks. It is for people who beta test physical products in the field and need timestamped evidence and a report for the manufacturer.
Is BetaSuite a subscription?: No. It is a one-time purchase from the App Store or Google Play, with no subscription, no ads and no account. Each store sets the price.

Start testing with timestamped evidence

BetaSuite: Tester's Toolkit burns the date and time into every photo and video, then turns your sessions, markers and findings into a PDF or Word report, on iPhone, iPad and Android. Only need a timestamp camera? Use Basic mode.

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No account needed. The price is set in each store.

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