Engineers can discuss solar PV, EV charging, batteries, and installation constraints in English. Chinese pages are also available.
Service area and remote support
We support customers around Kanto bases such as Yokota, Zama, Yokosuka, and Atsugi. For distant areas, we coordinate with trusted local partners while providing English design, scheduling, and remote QA support.
それに併せてというよりも、こちらが主なのですが、オプティマイザーを用いたパワコンシステムの利用によりパネル1~2枚毎の最適化が可能になり、障害物の影や汚れ、劣化パネルの影響を最小化することで発電量の改善が期待できます。また、O&Mに関してもパネル毎の遠隔監視により修理やメンテナンスの効率化が可能です。
SolarEdge HP 参照
Power Revolution: Pioneering the Future with Autonomous, Distributed, and Flexibly Grid‑Connected Sources
We propose reliable solutions to realize a sustainable society through the spread of renewable energy and EVs—the most familiar and scalable form of large‑capacity battery storage. We strongly promote the introduction and support of the best‑fit mix for enterprises and households alike: renewable systems, EV charging, self‑consumption, and IoT.
English‑Speaking Solar & EV Support in Japan
We support expatriates, international residents, US military personnel, diplomats, schools, SMEs, and EV owners across Japan. English support is handled by engineers, not only sales staff, so technical questions about solar PV, EV charging, batteries, and installation constraints can be discussed directly.
We have experience with customers around Kanto bases such as Yokota, Zama, Yokosuka, and Atsugi. For distant areas such as Misawa, Iwakuni, and Sasebo, we coordinate with trusted local partners while providing English design, scheduling, and remote QA support.
In Saitama Prefecture’s Shibusawa MIX Open Innovation Program Canvas, a co‑creation project by Hamaya Co., Ltd. and I‑S3 Co., Ltd., “Creating a New Life in Unelectrified Areas with Used Solar Panels,” was selected and presented after demonstration testing.
The project combines Hamaya’s reuse and overseas network with I‑S3’s solar PV engineering to repurpose used solar panels as power infrastructure in developing regions. In the Higashimatsuyama demonstration, a mixed set of used panels from different manufacturers and specifications reportedly achieved performance comparable to new panels.
Solar PV + AI Special Page: From Prediction to Operations and Rapid Response
I‑S3 focuses on using AI not as a vague promise to predict failure dates, but as a practical way to understand panel‑ and string‑level conditions, detect anomalies early, and prioritize field response.
Self‑Consumption Solar for Factories and Businesses
We organize 30‑minute demand data, roof and receiving‑equipment conditions, on‑site PPA options, reverse‑power‑flow prevention, and EV charging combinations so customers can evaluate practical electricity cost reduction.
Self‑consumption special page
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EPC — Engineering / Procurement / Construction
3D modeling that considers meteorology, obstacles, racking angle, module & inverter characteristics, and stringing; performance evaluation with PVSyst; competitive procurement via direct sourcing; and experienced, efficient construction.
See details
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O&M — Monitoring, Call‑out, Reporting
Always‑on monitoring, unlimited call‑outs (incl. minor repair), and biannual reports. We analyze telemetry continuously so we can respond fast—independent of periodic inspection cycles.
See details
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Repair / Inspection / Repowering
IV‑curve tracing and on‑site diagnosis even without existing monitoring; optimization proposals incl. optimizers and over‑paneling; we also handle non‑I‑S3 plants.
See details
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Repowering special
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Residential Roof (Self‑consumption)
Safe, reliable systems leveraging optimizers (e.g., SolarEdge), enabling placement even with shade or on the north side; realistic generation estimates via detailed simulation.
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EV Charging — Overview & Installations
Home charging (AC 200V / Level‑2) is the backbone; we also deploy destination charging at hotels and businesses, and multi‑bay load‑sharing at workplaces. Same‑day survey & install available in many cases.
Overview
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Install examples
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Remote Monitoring & Outage Notifier
Cloud‑connected programmable camera for plant monitoring and a low‑cost outage notification device “Denkinaizo®” that emails stakeholders instantly on power loss.
Monitoring camera
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Denkinaizo
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Software Development & Data
Python‑centric apps, IoT/control, AI solutions, data analysis support, 3D presentation assets, and internal/customer‑facing tools for renewable‑energy operations. We also publish tools such as I‑S3 String Planner for preliminary string design checks.
Software development
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Renewables + IoT
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I‑S3 String Planner
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Safe Solar PV Systems
We build high‑safety, high‑performance PV systems—particularly strong with SolarEdge safeDC™ that reduces module‑level DC to 1V when not in normal operation, greatly lowering fire and shock risk. We propose optimal plans and provide solid after‑care.
I‑S3 can design and install systems with safety as a primary requirement, while still selecting from a variety of panels, inverters, power conditioners, and storage systems according to budget and compatibility with existing equipment.
About the Solar‑PV Requirement in Gunma Prefecture
This section summarizes the Gunma Prefecture solar‑PV requirement. Safety‑focused system design is covered separately above under “Safe Solar PV Systems.”
Explanatory obligation by architects to owners for buildings with total floor area ≥ 10 m²
Installation obligation for buildings with total floor area ≥ 2,000 m²
Support for the explanatory obligation
For professionals who have traditionally focused on housing or building construction, explaining renewable‑energy systems can be difficult when it suddenly becomes an obligation. I‑S3 can support explanations, remote or on‑site consultations, and seminars where appropriate.
Solar PV is a key to sustainable living. Batteries make that possible in daily life, and the most familiar, fast‑spreading battery is the EV. PV is already widespread thanks to low cost and easy installation almost anywhere, making it a resilient distributed source that taps virtually limitless solar energy. Yet we still need electricity at night and in bad weather, so storage is essential. With enough batteries, self‑sufficiency on renewables alone is no dream. EVs accelerate battery uptake close to home. Through the spread of PV and EVs, we contribute to a sustainable society.
Why self‑consumption solar now?
Local generation for local use is rising, and PV is the most installable and cost‑effective distributed source. Resource prices have surged, lifting electricity costs for households and businesses. Announced utility price hikes—30–40% in some regions—magnify the burden. The root issue is reliance on imported fuels that are volatile and unpredictable. Reducing overseas dependence and shifting toward renewable, locally‑produced energy such as solar PV is the only sustainable path.
Once installed, PV keeps producing electricity without fuel purchases. Rooftop and on‑site systems can generate power near demand, reducing grid purchases, price volatility, and long‑term business risk.
Do homes and workplaces need EV chargers? How many?
The practical backbone of EV charging is AC 200V / Level‑2 charging at places where vehicles stay for a long time: homes, offices, hotels, apartments, and workplaces. In the long run, each regular parking space should ideally have charging access, so charger planning should start with power availability at parking areas.
Is O&M indispensable for a PV business?
Owners can theoretically inspect, maintain, repair, and mow by themselves, but doing so consistently for 20 years or more is difficult. Monitoring, call‑out response, repair coordination, insurance evidence, and reporting reduce losses when trouble occurs.
What’s in an O&M service?
I‑S3 emphasizes continuous remote monitoring, anomaly response, call‑out support, minor repair, regular inspection, IV‑curve measurement, thermal imaging, visual checks, performance review, and reporting. The point is to notice problems early and act before generation loss expands.
Can existing plants improve generation?
Yes. First, we check whether existing equipment is operating correctly: inverter output, fuses, construction quality, obstacles, shade, string configuration, and module/string health through IV measurement. Depending on the cause, improvements may come from repair, tree or obstacle management, string reconfiguration, or repowering.
What is repowering?
Repowering is not merely restoring lost output. It means replacing or upgrading older inverter/power‑conditioning systems with newer distributed, optimizer‑based, or otherwise more resilient architectures to improve generation, reduce business risk, and support very long‑term operation.
Repowering special page
Key points for PV where people live/work
For homes, offices, stores, factories, and other places where people are present, safety and maintainability matter as much as generation. Module‑level shutdown, careful design, realistic simulation, compatible equipment selection, and long‑term serviceability should be considered from the beginning.
This website and business portal are produced by I‑S3 Co., Ltd.
Legal disclosure based on Japan’s Specified Commercial Transactions Act
I‑S3 Co., Ltd.
Representative Director: Suomi Masuda
1311‑1 Iizuka‑machi, Takasaki‑shi, Gunma 370‑0069
TEL/FAX: 027‑381‑6583
Email: s_masuda@i-s3.com
Operations manager: Suomi Masuda
Additional fees: Any customer‑borne charges other than the product or service price are included in the product or service price unless otherwise agreed in an individual transaction.
Returns and exchanges: Before shipment, cancellation is possible where a cancellation button is available. After shipment, unopened products may be refunded or exchanged for an equal or lower value product within 10 days after arrival if the customer contacts us; return shipping is borne by the customer. Opened products cannot be returned or exchanged. If the product has a defect, I‑S3 will bear shipping costs and provide a refund or replacement.
Accepted payment methods: credit card or domestic bank transfer. Payment timing depends on the terms of each individual transaction.
I-S3の取り組み紹介
I-S3の事業領域と再エネ・EVへの考え方を短く確認できます。
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EVと再生可能エネルギー
太陽光発電とEVを組み合わせる意義を、暮らしと地域エネルギーの視点で紹介します。
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EV充電器の基本
住宅・事業所で使う普通充電器の考え方と、設置相談の入口を確認できます。
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EV充電設備の選び方
車種、分電盤、駐車位置、台数から充電設備を考える流れを整理します。
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EV充電ネットワーク
A-Chargeなど、駐車時間を活かしたAC普通充電ネットワークの考え方を紹介します。
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リパワリング解説
既設太陽光の停止時間を抑えながら発電量改善を目指す考え方を説明します。
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太陽光発電の改善
監視データや設備構成を見直し、既設発電所の改善余地を探る視点を紹介します。
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AIとシミュレーション提案
30分値や現場条件を使い、提案品質を高めるデータ活用の方向性を紹介します。
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EV充電工事の紹介動画をYouTubeで見る
EV充電サービスの紹介動画をYouTubeで見る
