Campus charging and community charging are not the same business. Compounds charge steadily all year; campuses surge with the calendar — five weeks of winter holiday, seven of summer, then a sudden full house. Communities built charging failures into their first year by copying a residential playbook: one empty corner, twenty ports, power on. Six months later came term-start queues, idle equipment in the holidays, midnight-full shelters and batteries smuggled into dormitories. The root difference is rhythm: campus demand is not distributed, it is tidal.
Three campus realities that change the design
- Extreme tides. With roughly 5 winter and 7 summer holiday weeks, term-time daily demand can be ten times holiday demand. Size everything to the peak and the assets idle for a quarter of the year; size to the average and the queues start in September. We install fixed capacity for about 70% of the measured peak and keep roughly 30% as reserve circuits and movable supplement.
- The school carries the responsibility. In a compound, first liability sits with the property; on a campus, an incident lands on the school's safety record. So people-vehicle separation, physical isolation between charging areas and dormitories, and night-time automatic cut-off are hard requirements in our designs, not options.
- Billing is complicated. Students, faculty, outsourced contractors and short-term visitors need different prices and permissions — a generic scan-to-pay box cannot manage that. Our platform runs separate tariff classes and access rules per group on the same hardware.
Capacity in three steps, not guesses
- Inventory. University e-bike ownership typically runs 25–40% of enrolled students, so a 20,000-student campus holds roughly 5,000–8,000 machines; primary and secondary schools mostly track faculty, estimated at 30–50% of staff headcount.
- Simultaneity. The dormitory peak runs 22:00–07:00; plan on 15–25% of vehicles charging at once.
- Load check. E-bike ports draw 200–300 W each; a full 10-port unit is only 2–3 kW.
Worked example: 8,000 vehicles at a 20% simultaneous rate need about 1,600 ports — roughly 160 ten-port units, about 400 kW in total. At that scale the conversation is usually a dedicated transformer or load scheduling against the campus's existing feeders. We deliver a 7-day measured load report at survey stage, not a device quote first and a capacity argument later. If the school also wants vehicle charging, we reserve 7kW AC bays at 10–20% of parking spaces and start DC with one or two 120kW units, sharing tray routes and power paths so civil works cost 20–30% less than separate builds.
Three zones, three layouts
- Dormitory living zones — centralised shelters. The demand centre. One shelter per 300–500 residents, placed on downwind edge ground outside the dormitory blocks, within a 100-metre walk, with canopy, extinguishers and CCTV — and never beside evacuation routes, entrance halls or stairwells.
- Teaching and office zones — scattered top-ups. Small 10–20 port points at teaching buildings, libraries and labs absorb between-class and office-hour charging and shave the dormitory peak.
- Faculty and visitor zones — fast and slow together. 7kW AC covers an 8-hour working day; one or two DC units at the gate or visitor centre serve external vehicles and inter-school visits.
All three zones join one platform with separate tariff and permission classes, so the logistics office sees every device, its energy and its revenue in one back office.
The six compliance lines we will not cross
The national fire regulation in force since August 2021 bans e-bike parking or charging in entrance halls, evacuation routes and stairwells of high-rise buildings, and fire authorities inspect campuses with rising frequency. Every campus project we deliver satisfies at least these six:
- Charging areas keep fire-separation distance from dormitory and teaching buildings and never occupy fire lanes or aerial-ladder ground.
- Dedicated supply circuits with independent RCD and overload protection per port.
- Full-charge auto-stop, overload cut-off with self-recovery, short-circuit and earth-leakage clearing within 0.1 s.
- Shelters in non-combustible or flame-retardant materials, each with extinguishers and a fire-sand box.
- CCTV coverage of charging areas, integrated with campus security, footage kept at least 30 days.
- Enclosures rated IP54 or better outdoors, with rain shading and drainage at exposed points.
We also recommend a management document to match the hardware: batteries banned from indoor charging, published opening hours, and a student self-discipline patrol. Equipment lowers risk; management closes it.
Common questions
- How many ports does a 20,000-student university need?
- At 25-40% e-bike ownership that is 5,000-8,000 machines; with a 15-25% night-time simultaneous rate, plan roughly 1,000-1,600 ports in dormitory shelters plus scattered teaching-zone points. We confirm with a measured survey, not assumptions.
- What happens to the equipment during the long holidays?
- Fixed capacity is sized to about 70% of the measured term peak, with reserve circuits and movable supplement for surges. Holiday months need little power, so utilisation cost drops instead of assets idling at full scale.
- Can students, staff and visitors be billed differently?
- Yes. The Dongdian Huichong platform runs separate tariff and permission classes per group on the same hardware - student packages, staff welfare rates, contractor and visitor scan-to-charge - with one dashboard for the logistics office.