How to use StopWatt

Do you need to do anything after plugging StopWatt in?

No. StopWatt is a passive device — it starts working the moment it's plugged into a standard 90V-250V outlet, and there is nothing to configure, pair, or switch on. If you haven't physically installed it yet, see the installation guide for the setup steps; this page picks up from there.

What does the indicator light mean?

The light on the front of the device simply confirms it's receiving power from the outlet. It is not a savings meter and does not change color or blink to indicate performance. If the light is off, the device isn't getting power — check the outlet, breaker, or power strip it's plugged into before assuming a defect.

How many devices should you run, and where?

• Plug each unit into an outlet on or near the circuit with the appliance you want to target — HVAC, refrigerator, well pump, or another motor-driven load.
• One device addresses one circuit; a single unit plugged into a lightly used outlet across the house from your biggest appliance is unlikely to do much.
• Homes with multiple major appliance circuits generally see units placed near each of those circuits used together, which is also why bundle pricing favors 2 and 3-device orders.
• There is no limit or interaction to manage between multiple devices — each works independently.

Setting up daily use after installation

1. 1

   Choose the outlet

   Pick an outlet on or near your highest-draw appliance circuit, such as HVAC or refrigeration.

2. 2

   Plug it in directly

   Insert the device fully into the outlet; no adapter or extension cord is required.

3. 3

   Check the light

   Confirm the indicator light is on, meaning the device is receiving power.

4. 4

   Leave it in place

   StopWatt is designed to stay plugged in continuously; there's no daily on/off routine.

5. 5

   Repeat per circuit

   If you bought a 2 or 3-device bundle, plug each additional unit into a separate major appliance circuit.

What should you do in the first 60 days?

• Note your baseline electric bill or a kWh reading from the days right before you plugged the device in.
• Keep the device plugged in continuously rather than testing it on and off, which makes comparison harder.
• Avoid changing other habits (thermostat settings, appliance use) during the test window if you want a clean comparison.
• Compare a full billing cycle, or at least two to three weeks, of kWh data before drawing a conclusion.
• If you're not seeing the change you expected by day 45-50, you still have time to request a refund inside the 60-day window — see warranty and guarantee.

How do you honestly measure kWh, not just guess?

The most reliable way to judge results is a plug-in kWh meter on the specific appliance you're targeting, read before and after installing StopWatt, or a full utility bill comparison across two similar-weather billing periods. Avoid comparing a single day to another single day, since weather and appliance cycles swing daily usage more than a power-factor device typically will. For the full math and calculator, see electricity cost calculator and does StopWatt lower your electric bill.

What StopWatt does not do during daily use

It's worth repeating plainly: StopWatt is not a generator, battery, or meter-altering device. It does not produce power, store power, or interfere with your utility meter's reading. It performs passive power-factor correction on the circuit it's plugged into. US residential meters bill real power (kWh) rather than reactive power, which is why the benefit is concentrated in motor-heavy homes rather than universal. See what is power-factor correction for the underlying explanation.

What if it doesn't seem to be doing anything?

If your first 60 days of honest kWh comparison don't show the result you hoped for, that's exactly what the guarantee is for. Every order from this official store includes free worldwide shipping and a 60-day money-back guarantee on the purchase price. You can also check does StopWatt really work for a full breakdown of when this technology helps and when it doesn't before deciding whether to keep it or request a refund.