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Sundays-onsite

Mulhouse, France

SolarPrivate
Founded 202650-200 employees

About

Founded in 2026, Sundays-onsite is a private headquartered in Mulhouse, France with approximately 50-200 employees specializing in Solar.

Sundays-onsite is the field subsidiary of Sundays Data System, specializing in preventive maintenance of photovoltaic inverters and systems. The company deploys technicians directly to installations throughout France to perform preventive component replacement, I-V curve tracing using certified Seaward equipment, monitoring system configuration and troubleshooting, and performance audits. Services cover multi-brand inverters (SMA, Fronius, Sungrow, Huawei, ABB, KACO, KOSTAL) with a 90% repair success rate and 3-year warranty post-intervention. The company has treated over 5,000 inverters and serves 900 clients across 12 countries, emphasizing the 'Renewable 2.0' philosophy: repair rather than replace, prevent rather than react, transmit expertise rather than improvise.

preventive maintenanceI-V curve diagnosticsphotovoltaicon-site serviceinverter repairmonitoring systemsmulti-brand support

Headquarters

Mulhouse, France

Founded

2026

Employees

50-200

Company Type

Private

Business Models

B2BESCO

Value Chain

O&MConsultingConstruction

Service Regions

France

Projects

130 kWc Alsace Installation

SEVE Multi-site Maintenance

Solarmax 50 SHT Repair and Monitoring Harmonization

SMA STP 17000 Preventive Maintenance

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