Modules, batteries and chargers are engineering decisions before they are catalogue decisions. A feasibility study built on 12 months of bills, a structural check, a design that integrates with your board, utility homologation and metered commissioning — in that order the investment repays and the installation stays safe.
Not every case needs rooftop modules, and not every roof takes modules. The work starts by identifying which front makes sense for your load, your property and your contract with the distributor.
Grid-tied system integrated into the board, with balanced strings, surge protection, dedicated earthing and room to grow. The roof is verified first: structure, orientation, shading and safe access for maintenance.
When the roof does not work or is not yours: a plant on land, remote self-production or a shared generation arrangement. Here the study is as regulatory as it is electrical, because the framework decides who receives the credit.
From a single home point to a condominium with twelve bays: dedicated circuit, residual current protection suited to dc fault current, load balancing across chargers and a cost-splitting rule that does not turn into an assembly fight.
A battery has a clear use case: shifting the peak, holding essential load during an outage, or raising self-consumption for sites that work by day and consume by night. Outside those cases the payback rarely closes — and I say so before the quote.
Cutting load first reduces module count, cable length and contract value. The same roof then serves more useful load, and cheap surplus credit stops being the main destination of your energy.
An installed system gets an inspected survey: insulation, continuity, string by string, connector thermography and a review of fixings. It is the document insurers, head offices and the utility ask for — and the one that prevents a badly crimped connector from heating up.
Each stage has a deliverable and an acceptance criterion. Skipping the first one is what produces a handsome array and a nearly identical bill.
Reading of 12 months of bills, hourly profile, available area, orientation and shading, plus a conversation about load growth and contract changes. The output is a verdict: worth it, not worth it, or worth it in another arrangement.
3 to 7 daysPower and string arrangement chosen, month-by-month generation simulation, self-consumption versus surplus defined, and payback expressed as a band. Two or three investment options, each with its stated criterion.
3 to 5 daysSingle-line diagram drawn over what already exists, AC and DC boards, protection, earthing, lightning protection where applicable, cable routing, signage and structural verification of the roof. Design ART filed.
5 to 10 daysAccess request filed, access opinion followed up, requirements answered and the system placed under the right compensation framework. That clock belongs to the regulator, not to me — which is why I plan the site date with contingency.
10 to 60 daysExecution with a checklist for crimping, torque, continuity, insulation and earthing, with photographic records per string. Coordination with the local electrical crew and full NR-10 and NR-35 discipline on the roof.
2 to 10 daysEvery string tested under real conditions, production compared against the simulation, inverter firmware adjusted, monitoring configured, staff trained on reading the indicators, and the dossier delivered with the report.
1 to 2 daysOne package that serves three readers: whoever installs it, whoever approves it at the utility, and whoever signs the financing or the internal investment approval.
The access opinion is the document that states accepted power, connection point, metering system and compensation rules. Designing without it risks rework on a board already installed. I follow the filing and answer utility requirements within the same scope, until approval.
Generation, charging and storage touch the electrical design, the utility regulation and the manufacturer warranty at the same time. The list below is what appears in the specification.
| Reference | What it demands | What it affects |
|---|---|---|
| NBR 16690 | Design requirements for the electrical installation of PV arrays: dc conductors, protection, isolation and identification | String layout, solar cable, DC box and live isolation |
| NBR 5410 | Low voltage integration: sizing, residual current protection, discrimination, earthing and voltage drop | Integration board, dedicated circuit and declared RCD bypass |
| NBR 17019 | EV charging infrastructure in buildings, with performance requirements and verification procedure | Garage, per-unit cost splitting, load reserve and expansion plan |
| NBR 5419 | Interaction with lightning protection, bonding and safe separation distances | Roof fixings, earth grid and generator earthing |
| ANEEL Resolution 1.000/2021 | Access rules: request, review, access opinion, deadlines and metering system | Homologation schedule and the power the network accepts |
| Law 14.300/2022 (GD framework) | Credit compensation rules, gradual payment of the decentralised contracting wire and rights acquired by date | The assumptions behind the payback shown in the study |
Your distributor regulations and the local fire brigade instructions may add specific requirements. The specification cites the standard, the resolution and the document of the approving body, in the order in which each decision is taken.
Report and ART for the system dossier
Modules are the visible part of the investment. What decides the outcome is what nobody photographs: the structure carrying the array, the space left in the board, the cable length that limits voltage and the connection point the utility will accept.
Every kilowatt-hour that stops existing is a kilowatt-hour the system does not have to generate. Drag the sliders to size the efficiency that should precede generation investment — the output is a band, not a promise.
766 per month
per year: R$ 9.193
With those three I can return a preliminary feasibility verdict, indicate the likely power and warn you of any structural or regulatory blocker. The design proposal follows, with scope and timeline per stage.
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Learn moreA generator is not simply a source that injects. From the moment it exists, circuits that were passive can have two sources, current direction changes, isolation needs visible identification, and residual current protection may need a declared bypass. At the same time the board gains a busbar where load and generation add vectorially, which changes the effective current in every conductor. This is exactly where the low voltage standard and the photovoltaic array standard cross — and this is where a design drawn only by a kit seller usually fails.
A battery is justified by three clear hypotheses: shifting consumption out of the peak, keeping essential load alive during an outage, or raising self-consumption where the site runs by day. Vehicle charging is justified when there is idle capacity in the board — and it is almost always the charger that sets the size of future expansion, not the array. When all three appear together the order of the study matters: measure the load, cut the waste, size the generation, then the battery, and only at the end the charging power.
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