A solar system that works. Wiring included.
Size panels, battery and controller. Check the parts fit before you buy. For a camper van, an off-grid cabin, a rooftop with a battery or a balcony plant.
// before you buy
Catch the wrong part before you buy it.
A panel, a controller and a battery can each be fine on their own and still not work together. Amperly checks the combination.
Messages from the camper van example in the screenshots. If a datasheet value is missing, Amperly says “not checked”. It does not guess.
// features
From what you run to the parts list.
Off-grid sizing
List what you run, like a fridge, lights and a laptop. Amperly sizes the panels, battery bank, charge controller, inverter and wire size.
Designed for the dark month
The system is sized for the darkest month you actually use it, not for the yearly average.
Yield for grid-tied setups
For a balcony plant or a rooftop with a battery you see the yield per year, the saving and the payback.
See how every number was made
Every result comes with its math. You see where each voltage, current and wire size comes from.
Your own components
Add the panels, batteries and controllers you are looking at, with their datasheet values, and check them against each other.
Saved systems
The van, the cabin, the house. Each saved system shows whether its checks passed. Systems are stored only on your phone.
// real sun data
Sun data for your place, not a rule of thumb.
Type a town, pick the panel tilt and the direction it faces. Amperly loads monthly irradiation and temperatures for that spot.
- PVGIS
- Monthly irradiation, from the service run by the European Commission
- NASA POWER
- Temperatures for the cold and heat voltage checks
- Your phone
- Only rounded coordinates leave it. The calculation itself runs offline.
// a look inside
Six screens, one system.
// free and pro
The checks are free. Pro is paid once.
Every check and warning is in the free version. There is no paywall in front of a problem with your wiring.
Free
$0
- Every check and warning
- Sun data from PVGIS and NASA POWER
- How every number was made
- 1 saved system
- 10 components of your own
Amperly Pro
One-time purchase · no subscription
- Unlimited systems and components
- A PDF report with a shopping list
- All three cable runs
Pro is a one-time purchase that never renews; the store shows the price for your country. See the Terms of Use and Privacy Policy.
Amperly does not replace an electrician. Have a qualified person check the wiring before you connect anything.
// questions
The short version.
When can I get it?
Amperly is coming to Google Play first. The iPhone version follows after that.
What if my datasheet is missing a value?
Then that check shows “not checked”. Amperly does not fill the gap with a guess.
Do I need an account or a signal?
No account. The calculation runs offline and your systems stay on your phone. Loading sun data for a new place needs a connection, and only rounded coordinates are sent. Details in the Privacy Policy.
Is Pro a subscription?
No. Pro is a one-time purchase. The checks and warnings stay free either way.
Check it before you buy it.
Panels, battery, controller, inverter and wire, sized for your place and checked against each other. Offline, no account, no ads.