Tender: Design and Installation of Integrated Smart Energy System (Solar, Battery, EV, Heat Pump) – g39, Cardiff

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g39 is seeking a suitably qualified and experienced Principal Contractor to design, supply, install, integrate, test and commission a fully operational Smart Local Energy System (SLES) at its ex‑industrial warehouse premises in Cardiff. The project scope combines approximately 20 kWp of rooftop Solar PV; a Sig Energy battery storage stack with vehicle-to-grid EV charging and an electric van that provides vehicle-to-building storage when parked; an air-to-air heat pump multi-split (ASHP) with point-of-use electric water heaters for domestic hot water; and a Sig Energy smart energy management system coordinating generation, storage, heating and vehicle charging with islanded back-up for critical loads during grid outages. The contractor will deliver complete services including site surveys, structural assessments, system design, equipment procurement, electrical and civil engineering works, DNO applications and approvals, planning and building regulations where applicable, subcontractor coordination, installation, integration, testing, commissioning, certification, monitoring, metering, optimisation, documentation, warranties and staff training, and must comply with applicable UK legislation, British Standards, electrical installation regulations and CDM 2015. The project is supported by the Welsh Government Ynni Cymru Capital Grant, has a maximum available budget of GBP 108000, a strict funding deadline with all works and final invoicing to be completed by 31 March 2027, and a pre-tender site visit is offered; further information is in the tender documentation.