String Inverter Integration Patents: Leaders, Trends & Gaps 2026
- Filing has peaked and is not climbing. 2025 hit 16 families, the high point in the series, but the midpoint year 2022 sat at just 3 — growth here is uneven, not a steady climb.
- Grid-side claims dominate over conversion hardware. H02J (power supply & grid systems) appears in 78 of 86 records versus 33 for H02M power conversion — the fight is over grid interaction logic, not the inverter itself.
- Ownership is fragmented, not consolidated. Co-assignee pairs are rare (7 total) and momentum among named assignees is flat-to-negative in the latest year, pointing to a field of dispersed single filers rather than a locked-in leader.
What this landscape covers
String inverter system integration sits at the junction of two claim traditions: power conversion hardware (how the inverter turns DC into grid-quality AC) and grid-interaction logic (how a fleet of string inverters behaves as a coordinated resource — voltage support, ride-through, statcom-like functions, and now microgrid dispatch). The dataset covers 86 patent families published between 2015 and mid-2026, filed across offices led by the United States and India, with meaningful volume also routed through EPO, WIPO/PCT, Canada and Australia. The most-cited records in the set, several sharing the statcom-utilization framing, date from earlier in the window — a reminder that citation counts reward age, not current relevance.
Because publication trails filing by roughly 18 months, the 2025-2026 figures in any trend chart understate real filing activity; treat the most recent one or two years as a floor, not a ceiling.
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Filing trend and technology composition
Two views of the same 86 families: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
A peak year, not a trend line
Filings ran from 1 in 2017 to a peak of 16 in 2025, with the midpoint year 2022 at only 3 — the series is lumpy rather than compounding, consistent with a technology area driven by episodic filing waves rather than continuous R&D investment.
Grid logic outweighs conversion hardware
H02J (power supply and grid systems) covers 78 of 86 records, more than double H02M (power conversion, 33). Smaller but present clusters in G05F, B60L, G06Q, G01R, G05B and G06N show the field increasingly touching measurement, EV integration, commerce/billing logic and AI-based control — but each of these remains a minority branch relative to the grid-integration core.
Shares are the percentage of the 86 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on String Inverter System Integration with Eureka
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Try EurekaThe most-cited records in this set
Energy management (US20230129230A1, Honda Motor Co., Ltd.)
A system for energy management receives configuration information for a microgrid and its distributed energy resources, then generates a dispatch profile to control those resources based on a detected outage, DER type, default operating conditions, and user preference — with the dispatch command able to draw on real-time DER status as well.Filed by Honda, published 2023-04-27 — illustrates how automotive-adjacent players are extending microgrid dispatch logic into territory historically claimed by inverter and grid-equipment specialists.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20120205981A1 | Utilization of distributed generator inverters as statcom | 154 |
| 2 | US20160176305A1 | Muilti-functional power management system | 123 |
| 3 | WO2011032265A1 | Utilization of distributed generator inverters as statcom | 69 |
| 4 | US20110273917A1 | Intelligent photovoltaic interface and system | 58 |
| 5 | US9325173B2 | Utilization of distributed generator inverters as STATCOM | 49 |
| 6 | US20200031238A1 | Vehicle-Solar-Grid Integration for Back up Power | 43 |
| 7 | US20150311718A1 | Optimizing voltage and VAR on the electric grid using distributed VAR sources | 35 |
| 8 | US20160094034A1 | Controlling demand and energy through photovoltaic inverters delivering vars | 29 |
| 9 | US10355611B2 | Multi-functional power management system | 25 |
| 10 | EP2478610A1 | Utilization of distributed generator inverters as statcom | 18 |
Citation counts accumulate over time inside this corpus, so older statcom-utilization filings lead the table by volume of citations rather than by present-day relevance.
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Browse MCP servers →What the numbers imply for filing strategy
Read together, the trend, the IPC split and the citation table point to a field where the core grid-interaction claims are getting crowded while several adjacent branches remain lightly staked.
A spike, not sustained growth
Filing went from 1 family in 2017 to a peak of 16 in 2025, but the 2022 midpoint sat at just 3 — this is episodic activity, likely tied to specific grid-code or incentive changes, not a steadily maturing field.
Grid-interaction logic is the contested ground
Power conversion hardware (H02M, 33 records) is a secondary concern compared with grid supply and coordination claims (H02J, 78 records) — new entrants should expect denser prior art on ride-through, voltage support and statcom-style function than on the conversion stage itself.
Fragmented ownership, few alliances
Only seven co-assignee pairings appear across the dataset, and momentum by assignee in the latest year is flat or falling for every named holder tracked — no single organisation is compounding a filing lead here.
EV and commerce logic are minority branches, growing
B60L (EV propulsion) and G06Q (commerce/data processing) each register 8 records, and G06N (AI-based control) only 3 — these branches are small enough that a well-drafted claim combining string-inverter grid logic with EV dispatch or AI-based control could still stake meaningfully open ground.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to string inverter system integration, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Varentec, Inc. | SENTIENT ENERGY TECHNOLOGY LLC | 4 |
| SMITH GREGORY J | JAMES NAGASHIMA MICHIO | 2 |
| University of Western Ontario | VARMA RAJIV KUMAR | 1 |
| University of Western Ontario | RAHMAN SHAH ARIFUR | 1 |
| University of Western Ontario | KHADKIKAR VINOD | 1 |
| VARMA RAJIV KUMAR | RAHMAN SHAH ARIFUR | 1 |
| VARMA RAJIV KUMAR | KHADKIKAR VINOD | 1 |
The strongest co-assignee pairing in the dataset links a utility-side inverter specialist with a distribution-monitoring firm — most other pairings are single instances involving named inventors rather than repeat corporate partners.
Who is filing, and how fast they are moving
No assignee in the tracked set shows positive momentum in the latest year — the picture is one of past filing bursts rather than an active filing race.
Even the most active recent filer is slowing
DG Matrix filed 1 family in the latest year, down 75% year over year — the single clearest sign of recent activity in the tracked assignee list, yet still a contraction rather than a build-up.
Several once-active holders have gone quiet
Organizations including a university group and a research institute in the tracked set show zero filings in the latest year, following earlier activity — consistent with the field's overall peak-and-plateau filing pattern rather than sustained institutional programmes.
Automotive players are extending into microgrid dispatch
Honda's energy-management filing shows an automotive OEM claiming DER dispatch logic that overlaps with traditional string-inverter grid-integration territory, a sign that the competitive set is widening beyond dedicated inverter and utility-equipment manufacturers.
| Assignee | Recent year | YoY |
|---|---|---|
| DG MATRIX | 1 | -75% |
| Varentec, Inc. | 0 | — |
| University of Western Ontario | 0 | — |
| VARMA RAJIV KUMAR | 0 | -100% |
| Rensselaer Polytechnic Institute | 0 | — |
| SENTIENT ENERGY TECHNOLOGY LLC | 0 | — |
| Honda Motor Co., Ltd. | 0 | — |
| Huawei Technologies Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio strategy, or spotting where to file.
Map the H02J core in detail
With 78 of 86 records touching grid supply and coordination claims, a subclass-level breakdown of ride-through, voltage support and statcom-function claims would show exactly where the densest prior art sits before drafting new claims.
Explore grid-integration claim clustersWatch the cross-sector entrants
Honda's DER-dispatch filing and the B60L/G06Q overlap suggest automotive and data-platform players are moving into this space; tracking their filings separately from dedicated inverter manufacturers will surface competitive risk early.
Track adjacent-sector filingsRevisit the trend once the lag clears
Because 2025-2026 filings are still publishing, the true peak may exceed the 16 recorded for 2025; rerunning the trend view in six to twelve months will sharpen the read on whether this is a plateau or a new filing wave.
Rerun the filing trendCommon questions about string inverter integration patents
The tracked dataset contains 86 patent families published between 2015 and mid-2026 that match string inverter, PV string inverter or solar inverter claims combined with grid- or system-integration language. This counts patent families rather than raw document counts, which is the fairer unit because it neutralises duplicate filings across jurisdictions for the same invention. The true recent-year total is likely higher than shown, since publication typically lags filing by about 18 months.
Ownership in this dataset is fragmented rather than concentrated: only 7 co-assignee pairings appear across all 86 families, and none of the named assignees tracked for recent-year momentum show growth in the latest year. The most-cited individual records share a statcom-utilization framing and date from earlier in the window, which reflects citation accumulation over time rather than current filing leadership. This is a field better characterised by dispersed single filers and occasional cross-sector entrants than by one or two dominant portfolios.
The great majority of records, 78 of 86, fall under H02J (power supply and grid systems), covering grid interaction, voltage support and coordination logic. Power conversion hardware itself (H02M) appears in 33 records, less than half as often. Smaller clusters touch electric/magnetic control (G05F), EV propulsion (B60L), commerce and billing logic (G06Q), measurement (G01R), regulating systems (G05B) and AI-based control (G06N), showing the field's centre of gravity has shifted toward grid-behaviour claims rather than the inverter's internal conversion stage.
The filing trend is uneven rather than steadily rising: activity moved from 1 family in 2017 to a peak of 16 in 2025, but sat at just 3 in the 2022 midpoint year. That pattern suggests episodic filing waves, possibly tied to specific grid-code changes or incentive programmes, rather than continuous compounding R&D investment. Because 2025 and 2026 figures are still subject to publication lag, the recent peak may understate actual filing activity for those years.
The branches with the lowest record counts relative to the H02J grid-integration core are the most promising to examine: AI-based dispatch optimisation (only 3 records under G06N), EV-charging coordination (8 records under B60L), and billing or settlement logic tied to inverter fleets (8 records under G06Q). A first claim combining core grid-interaction logic with one of these adjacent branches — for example, real-time statcom measurement feedback loops under G01R — sits on comparatively thin prior art compared with the crowded core voltage-support and ride-through claims.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.