WattGro · by Power & Sun

Du premier prospect à la réception finale, dans un seul outil.

WattGro est conçu pour les ingénieurs solaires et les EPC de petite et moyenne taille du Golfe, d'Afrique et d'Inde. Gagnez le prospect, dimensionnez le champ, vérifiez chaque chaîne, chiffrez la nomenclature et émettez une offre que votre client peut signer — puis menez le chantier jusqu'aux achats, à l'installation, à la mise en service et à la réception, avec des contrôles d'ingénierie qui ne laissent passer aucune mauvaise conception.

Lancer une estimation gratuite → Essayer l'outil complet gratuitement — 60 jours ou 5 projets, sans carte →

Résidentiel L'installation d'une famille, dimensionnée à partir d'une seule facture.

Satellite-measured irradiance for 132 cities
IEC 62548 and NEC 690.8 checks on every string
No number from a language model
By Power & Sun, 4.5 GW+ shipped

Estimation gratuite

Trois questions, une réponse honnête

Indiquez le système, le site et ce que vous payez. La réponse est une estimation d'ingénieur fondée sur l'ensoleillement mesuré par satellite — énergie et économies uniquement, jamais un prix, et rien n'est conservé sauf si vous le demandez.

1 What kind of system? This decides which of the questions below are worth asking.

Grid connected A reliable supply, and you want a smaller bill.

Hybrid with battery A smaller bill, and the lights on through an outage.

Off grid No connection. Solar and storage carry it alone.

Solar + diesel generator The site runs on generators. Solar cuts the fuel they burn.

3 What you use, and what it costs Your own tariff, so the saving is yours rather than an average.

You pay per unit USD/kWh It is on your bill. We will not assume one for you. Paid for export USD/kWh, optional Leave blank if your meter does not pay you.

Diesel price USD/litre Delivered to site. The saving is fuel you no longer buy. Generator size kVA, optional A set must not run below about 30% load; this sets how much solar it can take.

Monthly bill USD Diesel burned a month litres or monthly units kWh

An off-grid or hybrid system is sized against what you use, so one of these is needed. Solar beside generators is sized against the load they carry, so one of these is needed.

When do you use most of it? Daytime Spread out Evenings and nights This decides how much of the generation you use rather than export.

Backup you want hours How long the battery should carry the place through an outage.

Add a battery? No, solar alongside the generators Yes, so the generators can switch off Without one, solar can carry about 60% of the daytime load. With one, the sets rest through the day and into the evening.

Days without sun to survive Off grid there is nothing to fall back on, so this sets the battery.

Nothing is stored. No account, no email, no follow-up unless you ask.

Energy figures only — no price, and not a quote. This estimate shows what a system could generate and what that energy is worth at the tariff you give. It never prices a system: a price comes from an engineer after a site survey. The figures are estimates under our engineering disclaimer. What you enter here is not stored. If you send an enquiry, we keep your details to answer it and delete an enquiry that does not become a job after 24 months — see the privacy notice.

Your estimate appears here

Answer the three sections and press Work it out.

An array sized to your roof and your load
Generation from the real sunlight at your coordinates
Storage sized for backup, or for days off grid
What it is worth at your own tariff

Le problème

Six outils pour un seul projet solaire

La plupart des EPC de petite et moyenne taille gèrent un chantier avec six outils : un tableur ou un CRM générique pour le prospect, PVsyst pour le productible, un logiciel de dessin pour la toiture, Excel pour les chaînes et la nomenclature, Word pour l'offre, puis des groupes WhatsApp et d'autres tableurs pour acheter, construire et livrer. Chaque modification est ressaisie ailleurs, et personne ne sait où en est un chantier. WattGro réunit le prospect, la conception, le prix, l'offre et la réalisation dans un seul dossier : une modification à un endroit s'applique partout.

Ce qu'il remplace

Un outil là où il y en avait six

Aujourd'hui	Avec WattGro
A spreadsheet or a generic CRM for leads	Leads, a deals pipeline, follow-ups, a shared calendar and email, with new enquiries from the estimator
PVsyst or Helioscope for yield	Hour-by-hour simulation, P50–P99, loss waterfall, in the same tool as the layout
A CAD or drawing tool for the roof	Roof, ground array and carport drawn to scale on the map, obstructions included
Excel for strings, cables and the BoQ	String and MPPT checks at cold and hot extremes, cable and protection sizing, a priced BoQ from a live catalogue
Word or PowerPoint for the proposal	A branded techno-commercial offer, project report and slides, generated from the approved design
Spreadsheets and WhatsApp for delivery	Milestones, purchase orders, a task board, timesheets, snags, commissioning checks, customer invoices and handover

Preuves

Éprouvé sur de vrais projets

Yield within 5% of PVGIS and of measured plants in Dubai, Lagos, Nairobi, Casablanca and Mumbai.

See the accuracy study →

300 projects designed by Power & Sun engineers on WattGro since January 2026.

Read what your customer would receive.

Open a sample proposal →

Prix

Gratuit pour commencer, au prix des petites équipes

Estimator free, always. Full tool free for 60 days or 5 projects, no card, then from USD 99 a month for your team.

Voir les offres et tarifs

Pour qui

Conçu pour votre façon de travailler

Pour les EPC et installateurs → Pour les revendeurs Power & Sun → Pour les développeurs et consultants →

Fonctionnalités

Tout, de la première demande à la réception

L'estimateur est la porte d'entrée. Derrière lui, un seul outil pour tout le chantier : gagner le prospect, relever, concevoir, chiffrer et émettre, puis acheter, construire, mettre en service, réceptionner et entretenir.

Win the work

Find the customer and the opportunity, and keep in touch until it is signed.

Public solar estimator for on-grid, hybrid, off-grid and PV-diesel systems
Enquiries land in the CRM as leads, with consent recorded
Customers, contacts, deals and a pipeline by stage
Follow-ups and tasks, with email templates for offers and reminders

Survey the site

Everything the design rests on, recorded once and checked.

Site on the map, with roofs, ground arrays and carports drawn to size, obstructions included
Roof detection and measured irradiance layers from Google Solar (Enterprise)
Read a site from a photo or drawing with AI (Enterprise), or import a KML outline
Survey assessment of roof, structure, soil, grid and access, turned into design checks
Weather from PVGIS, NREL NSRDB, NASA POWER or Solcast, or measured monthly data
Consumption from bills or monthly readings, load shapes, and flat, slab or time-of-use tariffs

Design the system

An engineer's design, worked out hour by hour and checked against the equipment.

On-grid, hybrid with storage, off-grid, and PV-diesel hybrid with generator dispatch
Equipment chosen automatically from your catalogue, or picked by hand
String sizing, MPPT allocation, cable sizing and protection, checked at cold and hot extremes
Battery sizing for backup, autonomy, self-consumption and peak shaving
Hour-by-hour simulation over a full year, single-axis trackers and bifacial gain
Loss waterfall, P50 to P99 yield, and shading and soiling allowances
Utility-scale plant model: inverter blocks, transformers and the MV network
Single-line diagram with DXF export, a 3D site model, and designs compared side by side
Design copilot: ask Claude about a design or for a change (Enterprise)

Quote and issue

From the design to a priced, signed-off offer the customer can open.

Bill of quantities with the cost build-up and country tax rules
Payback, IRR, NPV, LCOE and a sensitivity analysis; IPP and PPA models
Engineering review and approval by a second engineer before anything is issued
Techno-commercial EPC offer and customer proposal on your letterhead, shared by link
Project report, slides (PDF and PowerPoint) and a document checklist
Every figure in the project's own currency

Deliver and review

The project after the order, and the business across all of them.

Delivery plan, milestones and documents
Task board, Gantt chart, calendar and timesheets
Snag list, commissioning checks and handover
Reports on pipeline, proposals, capacity and the team, in Excel and PDF

See every feature See plans and pricing

Ce qu'il fait, et ce qu'il ne fait pas

What it does

Uses satellite-measured irradiance for the cities in the list, and a modelled climate anywhere else. The result says which it used.
Puts that sunlight onto the plane your roof actually is — its tilt and the way it faces — rather than assuming an ideal south-facing slope.
Takes off temperature, soiling, wiring, inverter and shading losses, with a soiling allowance that is higher in dusty climates because that is where it bites.
Sizes the array against your roof and your consumption, and says which one ran out first.
Off grid, sizes on the leanest month and on the days of autonomy you asked for, and tells you plainly when the roof cannot carry the load.

What it doesn't

Look at your roof. Structure, obstructions, access and the switchboard all move the answer, sometimes a long way.
Know your load shape. It works from one question about when you use power, where a design reads your half-hourly data.
Price anything. Not the system, not the battery, not the work.
Simulate the year hour by hour. The full tool runs 8,760 steps, checks strings against the inverter, sizes cables and protection, and produces a bill of materials.
Replace an engineer. Every number here is indicative and carries a band of roughly plus or minus fifteen per cent.

De l'estimation à l'installation

Le solaire pour tous les types de sites

**Homes**Rooftop systems sized to the roof and the bill, with a battery where the grid is unreliable.

**Business and industry**Factory, warehouse and commercial roofs, with storage to cut peak demand and keep production running.

**Utility and ground-mount**Ground-mounted plants and storage, engineered, procured and built under one EPC contract.

Engineered by Power & Sun

Une conception signée par un ingénieur, et l'équipement pour la réaliser

When you are ready, our engineers turn this estimate into a full design: an hour-by-hour simulation, strings and cables checked against the equipment, a bill of quantities and a firm EPC offer.

Site survey, structural and grid checks
Tier-1 modules with our own inverters and storage
Commissioning, performance testing and O&M

Talk to an engineer

**Mastter series**Hybrid inverters, single and three phase

**Ultimatte series**On-grid and off-grid inverters

**Tusk series**Low and high voltage battery storage

**Bison series**Wall and floor-standing lithium batteries

**Tusk C&I**Commercial and industrial storage cabinets

Power & Sun is part of the Orange Overseas group

Power & SunSolar distribution and EPC

**pv.market**AI digital marketplace for solar equipment

Vous voulez la vraie étude ?

Leave your details and an engineer picks it up: a survey, a proper hour-by-hour simulation, an equipment list and a price you can hold us to.

A site survey, not a satellite guess
A full technical report stating every assumption
A priced bill of quantities

We use your details to answer your enquiry, and to carry out the work if it goes ahead. Nothing else. An enquiry that does not become a job is deleted after 24 months.

Your name Email

Phone optional Town or city

Anything we should know optional