For SunPower PVS5 & PVS6 owners

Your true-up bill climbed. SunPower can’t tell you why.

Your panels never stopped — only their cloud did. Plug in WattHacker and see your whole system again: a clear “all good,” or an alert within days if one panel drops.

Get started See demo

Built for you

Not SunPower. Not an installer.

Your data

We never sell it. Export it anytime.

30-day money-back

Not for you? Full refund.

A real person

Email me. You’ll get a human.

Your whole system, on your phone.

Four tabs. Open any of them, anytime, from anywhere.

Home

Where your power is going right now: solar, home, grid, and battery.

Performance

Each day: what solar made, what your home used, and what went to the grid.

Panels

Every panel, every 15 minutes. Low ones flagged, with shade measured.

Health

Panels, microinverters, and the monitor. Green, or what needs a look.

And we tell you. A panel stops reporting: you hear within days. The monitor goes quiet: you hear within the day.

Nobody who sold you the panels writes the report.

We don’t make panels, inverters, or batteries. Nothing to protect.

What silence costs.

None of these announce themselves. All of them show up on the true-up.

One dead panelOne 425 W panel at $0.45/kWh makes about 820 kWh a year — roughly $31 a month.425 W, stops producing: $370a year
Shade you never mappedThe shade analyzer's own annual total on one real roof, priced at that home's rate plan. An estimate, modeled from clear days — your roof will differ.estimated on a real roof: $676a year
A panel fading, not dead820 kWh a year running 24% short, at $0.45/kWh.24% below the rest of your array — invisible without per-panel data: $89a year

Analysis SunPower never gave you.

Working today, on a real plan.

Per-panel monitoring

Every panel, every 15 minutes. Free plan included.

Shade analyzer

What shade costs, by roof face and by panel.

Degradation tracking

How fast your panels are fading, year over year.

Want me to look at it with you?A 45-minute energy review — your solar, your bill, what to do next. Monitor included.

Enphase is $999.
We’re $50.

Same data. Better analysis. 95% off other options.

Enphase — $999

A technician, a new electrical box, and half a day at home.

ENPH-CELL-KIT

WattHacker — $50

You connect two cables and Wi-Fi. 15 min tops.

See everything, without anyone coming to your house.

Will it work with mine?

If you have a SunPower PVS5 or PVS6, yes.

Have a Tesla Powerwall too? Connect it in the app, and it shows beside your panels.

A SunPower PVS5: a gray wall box with a dark window at the top and SUNPOWER on a band across the middle. — SunPowerAlready on your wall

A SunPower PVS6: a tall white wall box with SUNPOWER across the top. — SunPowerAlready on your wall

Plug-and-play. Your mother-in-law could install.

About 5 min to connect
Plug in a USB and ethernet cable (included)No electricianNo rewiringNo hardware swap

Sit back and watch individual panel data start streaming in 15 min!

Not sure which box you have? Email me — tony@watthacker.com

Why I built this

Tony Willcox

Founder · San Mateo County, CA

I paid my last utility bill in 2021, and haven’t bought natural gas or gasoline in four years. I’ve measured every circuit and appliance in my home for years, and I use that knowledge to help others spend less on energy — producing more with solar and using less with efficient heat pumps. Data unlocked energy for me, and I want to share it with everyone.

Electrification superfanClimate advocate31 solar panels5 heat pumps2 EVs30 energy trackers

tony@watthacker.com Read the full story →

Questions, answered

Straight answers — especially the ones a burned SunPower owner deserves.

Still wondering something? Email me — or poke around the live demo.

What’s in the box

Monitor ×13 × 1.6 × 2 in, plus antenna
USB cable ×112 in, USB-A to USB-C
Ethernet cable ×112 in

You’ll need: nothing else. It plugs straight into your PVS5 or PVS6, for power and data.

What owners say

100% 5-star reviews on Trustpilot

Read on Trustpilot

Mike
“The device is a great way for me to now have insights into my system after SunPower went away, and I was left with no data or expensive month-to-month charge options to see my own data, on my own system.”
“WattHacker founder, Tony, is personally engaged with the product, its development, its improvement and its fine tuning for your specific application.
He understands solar, home electrification, energy storage and savings strategies, and can help you utilize your system data derived with the WattHacker device for improved performance and upgrade planning.
The device is a great way for me to now have insights into my system after SunPower went away, and I was left with no data or expensive month-to-month charge options to see my own data, on my own system.
I find the current devise system configuration and the tools extremely useful, easy to install and use. I am looking forward to using and giving feedback on the system and its capabilities to enhance performance and visibility into my home solar system.”
23.9kWh/day
16 panels
Gigawatt
Aaron S.
“I had an issue with the first monitor and the owner reached out about the issue I was having before I noticed the issue. He sent me a new monitor and it’s been working great. Customer service alone is worth a 5-star review.”
“I’m very pleased overall. I had an issue with the first monitor and the owner reached out about the issue I was having before I noticed the issue. He sent me a new monitor and it’s been working great. Customer service alone is worth a 5-star review. I came across this product while doing a google a search and I’m very pleased overall with it.”
Jill H.
“An added bonus has been WattHacker.com, which gives us a way to monitor our solar system, better understand its performance and efficiency, and identify opportunities to maximize our energy savings.”
“Tony was an incredible resource as we navigated our home electrification project. There were a lot of moving parts and decisions to make, and he helped us understand our options in a way that was clear and easy to follow. He took the time to explore cost-saving solutions while also keeping energy efficiency and environmentally friendly choices in mind.
An added bonus has been WattHacker.com, which gives us a way to monitor our solar system, better understand its performance and efficiency, and identify opportunities to maximize our energy savings. It's great to have that kind of visibility into how our system is working.
We really appreciated Tony’s knowledge, patience, and thoughtful approach. He made what could have been an overwhelming process feel much more manageable. We're so grateful for his guidance and would highly recommend him to anyone looking to make their home more energy-efficient and environmentally friendly!”
22.8kWh/day
15 panels
Gigawatt
Received the monitor and plan free.

See how your system compares

Three ways to buy

30 days to change your mind — we refund your whole first order.

Kilowatt

The monitor. Free plan.

$50+ shipping

$50 monitor
$0 /yr service
plus shipping

No subscription.

Panel monitoring
Microinverter monitoring
Full system visibility
System alerts
Downloadable data
Data logs, 7 days

Start Kilowatt

Megawatt

The monitor. Full analysis.

$80today

$72/yr service

Free monitor ($50 value)

$8 shipping

Renews yearly ($72/yr), cancel anytime.

Kilowatt PLUS
Shade analyzer
Degradation tracking
Battery optimizer
Data logs, unlimited

Start Megawatt

Best value

Gigawatt

Pay once. Never again.

$199once

Free monitor
$199 service, for life
Free shipping

Enphase is $999 and a technician.
Same price to upgrade later. Buy now and the monitor and shipping are free.

Megawatt PLUS
Free monitor
Free shipping
45-min home energy review with Tony

Buy Gigawatt

Works with the SunPower PVS5 and PVS6 No tools — just Wi-Fi 30-day money-back guarantee

Your panels are still working. Start watching them.

See your whole system live in 15 minutes.

Get started

30-day money-back guarantee.