Warehouse solar combined with EV van fleet charging is one of the most economically compelling pairings in commercial energy. Peak solar generation (10am-3pm) coincides with driver break-charging windows at last-mile depots. An EV van fleet absorbs solar generation at 95%+ efficiency — dramatically better than typical warehouse self-consumption (72-81%). For a 500 kW PV system at a depot with 12 EV van charge points: annual saving of approximately £110,000 (versus £85,000 without EV charging) — the EV charging integration adds £25,000+ annual saving from improved self-consumption alone.
Why EV charging + solar is the ideal combination
Solar generation profile: peak output 10am-3pm in summer, 11am-2pm in winter. EV van fleet charging pattern at last-mile depots: main charging windows are 10am-3pm (driver break periods), overnight (7pm-6am). The 10am-3pm solar peak and depot break-charging window align precisely. Result: solar generation is absorbed by EV charging at near-100% efficiency during peak solar hours. Export to grid is minimised. Annual self-consumption rises from 72-80% (depot without EVs) to 90-97% (depot with EVs on break-charging). Each percentage point of improved self-consumption converts export at roughly 4–12p/kWh (SEG, as at July 2026) into avoided grid import at 21-25p/kWh — a 9-21p/kWh improvement per kWh.
EV fleet sizing and solar design
The solar PV system and EV charging infrastructure should be designed together. Key parameters: number of vans in fleet (current + planned for 5-year horizon), vehicle models and battery capacities (Mercedes eSprinter 111 kWh, Ford E-Transit 68 kWh, VW ID. Buzz Cargo 82 kWh, Renault Master E-Tech 87 kWh), daily range requirements, depot shift pattern, and HH meter data for existing electrical load. Typical depot design: 12-20 charge points (7 kW AC for overnight, 22-50 kW DC for break charging), 300-800 kW PV, smart charge management system that prioritises solar charge during peak generation. Size the PV to 100-120% of combined building load + EV charging at typical UK capacity.
Last-mile depot scenarios by operator type (illustrative)
Modelled scenarios, not real projects. A national delivery-office network electrifying its van fleet: solar + EV charging modelled at 94-97% self-consumption, annual saving per office £45,000-£90,000 (200-400 kW PV + 8-16 charge points). A regional parcel depot network transitioning to EV: solar + EV integration at regional DCs, 450-800 kW PV + 16-24 charge points. Urban parcel depots converting to EV van fleets follow the same pattern. Combined solar + EV charging is the standard decarbonisation package for the sector in 2026.
Common questions about solar ev charging
What's the minimum EV fleet size to justify combined solar + EV charging?
From 3-4 vans upward, EV charging integration improves solar self-consumption measurably. Maximum benefit at 12-24 vans per depot (absorbs peak solar output completely during break-charging windows). Below 3 vans: EV impact on self-consumption is small — solar economics still strong but not EV-dependent.
What charger types do you install alongside solar?
Standard depot specification: AC Type 2 (7 kW, 22 kW) for overnight and off-peak charging; DC rapid (50 kW, 100-150 kW) for break-charging windows where 30-45 minute turnaround is needed. Smart charge management system that prioritises solar generation over grid import during solar hours.
How does OZEV funding interact with solar + EV charging?
OZEV Workplace Charging Scheme provides a £500/socket grant (since 1 April 2026, to 31 March 2027) for EV charge points at workplaces, capped at 40 sockets per applicant. On a 16-socket depot installation: £8,000 OZEV grant. Combined with zero-VAT on EV chargers and 100% AIA on the combined solar + charger capex.