Comparisons ·
Which inverter brands let you access your own data
Inverter comparisons usually revolve around efficiency, price and warranty. This one compares on a parameter you won't find in those tables, and which matters every time you want to do anything with your system's data outside the manufacturer's app: can you get at it or not?
This is not a ranking of inverter quality. A brand at the bottom of the table may be technically excellent; it just keeps its data closer to its chest.
Why it's worth caring about
System data isn't just a graph to look at. It decides things when money is involved:
- Warranty claims. A year of production against a model is an argument. A screenshot from a phone is not.
- An independent second opinion. The manufacturer's app shows you numbers; it won't tell you whether they're good. Judging that requires getting the data out.
- Changing service. What happens to ten years of measurement if you move elsewhere, or if the portal shuts down?
- Your own use. Home automation, a spreadsheet, load management.
Three routes to the data
A token. You generate a long access code in the portal and hand it to a service you trust. The simplest route — your password stays yours and the access is read-only.
Account sharing. You share the system with another account (typically an "installer" or "guest" role), which then sees the data in its own portal. Works almost everywhere, but it's extra work and the roles tend to be coarse.
A partner API. The official interface for companies. Sometimes free, sometimes paid, and with some brands only after signing a contract.
The table
| Brand | Token for the owner | Account sharing | Note |
|---|---|---|---|
| SolarEdge | Yes, self-service (300 calls/day) | Yes (Associated Accounts) | The most open of the mainstream brands; terms explicitly anticipate consent-based data sharing |
| SolaX | Yes, self-service (10/min, 10,000/day) | Yes (Installer/Agent role) | The token returns current state only, no history |
| Growatt | Yes, self-service | Yes (via installer code) | We didn't verify the data scope available through sharing |
| Victron | Yes, self-service, full access | Yes (three different routes) | Technically the most open of all; off-grid and hybrid segment, not ordinary rooftops |
| Solis / Ginlong | Yes, but only after support approval (24–48 h) | Yes (Organization Code) | Terms explicitly anticipate authorised third-party applications |
| Sungrow | Not directly — an approval process taking days | Yes (by email or Organisation Code) | The "Administrator" role can change configuration — don't share that one |
| SMA | No — owner consent by email instead of a token | Yes (Sunny Portal / ennexOS) | Production API access is paid per system |
| Enphase | No — only owner consent through the app | Yes (requires owner approval) | Paid tiers; the free level is very limited |
| Fronius | Not for an ordinary owner | Yes (Owner/Supervisor/Guest) | Unusual: an interface on the inverter itself over your home network, free — but it takes networking know-how |
| GoodWe | No — API only under a signed agreement | Yes (Guest/Visitor role, no configuration access) | Terms explicitly restrict third-party access without consent |
| Solarman (Deye, Sofar and others) | No — only via a Business account | Yes (Business account) | Approval happens manually by email |
| Huawei FusionSolar | No — only an installer company may register for the API | Yes, and the most granular of all (per-plant roles) | For an independent third party, account sharing is the only real route |
How to read it
The top four (SolarEdge, SolaX, Growatt, Victron) share one thing: the decision is yours and it takes a minute. If you're choosing a new system and care that the data stays usable outside the manufacturer's app, start here.
The middle group (Solis, Sungrow, SMA, Enphase) will let you in, but through approval or for a fee. For the owner of a single house that usually means it's doable, just not in one afternoon.
The bottom group (GoodWe, Solarman, Huawei) keep automated access behind a contract or an installer account. It doesn't mean you can't reach your data — account sharing works with all three — but it means manual work on both sides.
Fronius is a special case worth calling out: the cloud is closed, but the inverter itself exposes an interface on your home network, free and in real time. For a technically confident owner that's the best data access of any brand; for everyone else it's out of reach.
Practical advice regardless of brand
- Always share the lowest sufficient role. Several portals distinguish "guest / read-only" from "administrator". Diagnostics needs reading. You don't have to give anyone an account that can change inverter settings.
- A token is a credential. Don't send it unencrypted and don't put it in a screenshot.
- Never hand over your account password in place of a token or sharing. That difference is the whole reason tokens exist.
- Ask about data while you're choosing. Before signing it's a one-sentence question; after installation it's a fixed property of what you own.
Where this comes from, and what we didn't verify
Honesty about method, because the table looks more certain than its sources are.
The comparison rests on research into twelve brands carried out on 8 July
2026, built from public manufacturer documentation, community tools and
vendor materials — not from direct contact with the vendors. The full
write-up with links lives in the project repository as
docs/vendor-integrace.md.
What that means for how much to trust it:
- Terms change. What held in July 2026 may not hold today. Rate limits and prices change without announcement at some brands.
- We don't know how deep the history goes for most brands. It's verified only for SolaX, where the answer is unambiguous: through the user token, there is none.
- We didn't verify the data scope of shared accounts for every brand — what exactly a "guest" sees differs, and documentation usually doesn't say.
- We deliberately left out per-country market shares. Public sources give either global aggregates or figures from materials close to a seller. Better omitted than unreliable.
- You won't find a legal reading here. Some brands' terms restrict third-party access; what that means in your case is a question for them, not for us.
Why Slunora currently reads only SolaX
It follows directly from this table. SolaX offers a self-service token, it's widespread in the Czech market, and its limitation (no history) is one we can work with — we simply measure the history ourselves by reading several times a day.
When we add a second brand, the table shows where to start. But before building a product on it, the terms need verifying directly with the manufacturer — which is exactly the thing this research did not do, and which it would be unfair to present as settled.
A guide to what we can do today is in how to get a SolaX Cloud API token. And the quick check works regardless of brand — it only needs a few figures copied from the app you already have.
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