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StopWatt

Technical breakdown

Does StopWatt lower your electric bill?

This is the single most important question to answer honestly, and the answer is: it depends on your home, and it may be nil. Below is the full explanation, not a marketing shortcut.

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Quick answer

No. Nobody can honestly promise a fixed percentage because it depends on your home's wiring, appliances, and how your utility bills you. Some homes see a small effect; some see none.

Start with how you're actually billed

Almost all US residential electric meters measure and bill real power, expressed in kilowatt-hours (kWh). They generally do not bill homeowners separately for reactive power the way many commercial and industrial meters do. This distinction matters because power-factor correction primarily targets reactive power.

What StopWatt changes, mechanically

StopWatt uses capacitors to supply reactive current locally to nearby inductive loads (motors, compressors, pumps) instead of that current traveling the full length of your home's wiring. This can reduce total current in the wiring and reduce small resistive (I²R) losses inside your walls.

Where that translates to a bill difference — and where it doesn't

ScenarioLikely bill impact
Home dominated by motors run many hours/day (pumps, older AC)Small reduction in in-home wiring losses is plausible
Newer home, short wiring runs, modern appliancesMinimal to no measurable change
Home mostly using resistive loads (ovens, heaters, incandescent bulbs)Little to no reactive load to correct — negligible impact
Commercial meter billed with a power-factor penaltyDifferent billing structure — not the typical residential case

What StopWatt does not do

  • It does not change what your meter measures or records.
  • It does not generate, store, or return electricity to the grid.
  • It does not reduce the actual energy consumed by resistive appliances.

How to find out for your specific home

  • Record your kWh usage (from your bill, not the dollar total) for the last two to three cycles.
  • Install the units near your largest inductive loads.
  • Keep your routine consistent for one full cycle.
  • Compare kWh against the same month a year earlier to control for weather.

If it doesn't move the needle for you

That's a legitimate possible outcome given how residential billing works, which is exactly why we back every order with a 60-day money-back guarantee on the purchase price. We would rather you test it and return it than keep a product that isn't doing anything for your specific home.

Every order from this official store includes free worldwide shipping, delivery in 1-2 business days to processing, and a 60-day money-back guarantee on the purchase price.

60DAYS

60-Day Money-Back Guarantee

Test StopWatt for a full billing cycle. Return it within 60 days of delivery for a refund of the purchase price.

Issued by the official StopWatt store · Refund of the purchase price

Frequently asked questions

Will StopWatt cut my bill by a fixed percentage?
No. Nobody can honestly promise a fixed percentage because it depends on your home's wiring, appliances, and how your utility bills you. Some homes see a small effect; some see none.
Why do some sellers advertise big savings numbers anyway?
Those figures are typically marketing extrapolations, not measured guarantees for your specific home. We avoid publishing savings percentages for that reason.
Is there any home where this is very unlikely to help?
Yes — homes with mostly resistive loads (electric heat, ovens, incandescent lighting) and modern, short wiring runs have little reactive load to correct in the first place.
What's the risk-free way to find out?
Track kWh before and after for a full billing cycle, and return the units within 60 days if you don't see the result you wanted.

Keep reading on the official StopWatt site

Ready to order? Buy StopWatt direct or compare StopWatt bundle pricing.

Order direct from the official store

Ready to try StopWatt risk-free?

Pick the bundle that matches your home size, then complete your order securely on this page — no redirects, no account required.

Sizing rule of thumb: one device per 800–1,200 sq ft, so most homes over 1,500 sq ft use the 3-device bundle.

Checkout — 3 Devices

$105.84

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  • Charged onceOne-time payment, no subscription
  • Dispatch1–2 business days, tracked
  • 60 daysReturn for a refund, no questions
  • Real supportsupport@getstopwatt.net

Prices in USD. The bundle price shown is the full discount — there is no code to hunt for. Add-ons available only here: add 1 extra stopwatt and 3-year replacement protection.