Charge More Than
Your Grid
Allows.

Your grid limits how many vehicles you can charge. A BESS removes that limit — quietly, without a grid upgrade, and with up to 70% of the cost covered by the government. Find out what you need with our easy to use calculator.

70%
Government funded — Depot Charging Scheme BESS is eligible when integrated with EV charging. Scheme details →
⏰ Window closes
30 June 2026
Works by 31 March 2027
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FleetCharging setupGrid supplyResults
How many vehicles need charging?
We'll calculate your depot's total energy requirement per charging cycle. You don't need electric vehicles yet — you just need a plan to get them.
🚐
Van
Up to 3.5t electric van · ~50 kWh per session
0
🚛
Rigid HGV
7.5t–18t electric rigid · ~130 kWh per session
0
🚚
Articulated HGV
26t–44t electric artic · ~260 kWh per session
0
🚌
Bus
Electric bus or coach · ~190 kWh per session
0
Add vehicles above to continue →
How and when do you charge?
Charger speed determines peak power demand. Charging profile shapes BESS sizing and unlocks time-of-use savings.
Charger speed per vehicle
22kW
AC Slow
Overnight AC. Vans and buses with 8+ hours available.
Vans · Bus
60kW
DC Fast
Good for vans and rigid HGVs with a long dwell time.
Vans · Rigid
150kW
DC Rapid
The depot standard for HGVs. Charges an artic in under 2 hours.
⭐ HGV Standard
350kW
Ultra Rapid
Maximum throughput. High-turnover depots and quick-turnaround operations.
High Throughput
Number of charge points to install
4 bays
1 bay20 bays
Charging profile — when do vehicles charge?
🌙 Overnight Only
Vehicles return and charge through the night. Most common for HGV long-haul and bus operations.
Window: 9–12 hours (8pm–7am)
☀️ Daytime Top-Up
Vehicles charge opportunistically between runs. Last-mile delivery, urban operations.
Window: 8–10 hours (7am–5pm)
🔄 Split Charging
Morning fast charge on return, overnight top-up. Two-shift operations or mixed patterns.
Two windows: ~4h morning + 8h overnight
⚡ Continuous Rotation
Vehicles plug in as they return, day and night. 24h depots, mixed shifts, high-frequency ops.
Effective window: 18–20 hours/day
⚡ Diversity factor: In practice, not all bays are used simultaneously. We apply a standard 70% diversity factor to your peak power calculation. This is consistent with industry practice for commercial depot charging design.
What can your grid supply?
Tell us what's available at your depot today — before any upgrade. We'll show you the gap and how a BESS fills it.
Incoming grid supply (3-phase) — select your fuse rating
Your electricity rate
22p/kWh
14p40p
Off-peak electricity rate
12p/kWh
6p (very cheap)22p
Off-peak starts
Off-peak ends
💡 How this works: The BESS charges on your cheap off-peak rate overnight, then delivers that stored energy during the day — avoiding the more expensive daytime rate. The saving is the difference between your two rates, multiplied by the energy your BESS shifts.
⚡ Your Depot Power Analysis
Peak Charging Demand
—
kW (with 70% diversity)
Grid Supply Available
—
kW from your DNO
⚡
Analysing...
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Peak Demand
—
BESS Energy Needed
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Vehicles Per Night
Fully charged

🌙 Off-peak saving: By charging your BESS overnight at your off-peak rate and delivering power during the day, we estimate an additional saving of — per year on top of removing the grid constraint.

⚡ Recommended System
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—
Integrated DC fast charging available across all Allye sizes (300 kWh–1.5 MWh)
Learn more →
🏦
Depot Charging Scheme — up to 70% funded by government
The DCS covers 70% of eligible costs — BESS, chargers, civil works — up to £1 million per company. We'll help you confirm eligibility, structure your application, and maximise what you claim. Full scheme details →
⏰ Window closes 30 June 2026 · works by 31 March 2027

Busting the myths about going electric

FactThat's exactly what a BESS solves. It charges slowly from your existing supply, then delivers high power on demand — no DNO upgrade needed. We've seen this work on 63A connections running 6+ rapid chargers.
FactAllye BESS systems are mobile and operational within days of delivery. Charger installation typically takes 1–3 weeks. Grid upgrades, by comparison, can take 6–18 months.
FactFor most UK distribution and last-mile operations — under 200 miles per day — current electric HGVs are fully capable. Range is only an issue for long-haul trunking, and battery density is improving every year.
FactThe BESS acts as a buffer — it charges slowly when vehicles are out, then delivers high power to whichever vehicles return. Dynamic load balancing means power is always available regardless of return schedule.
FactLFP chemistry is extremely stable — 6,000+ cycle life, no moving parts, remote monitoring as standard. Annual O&M is typically 1.5–2% of installed cost. Compare that to diesel trucks: service costs, DEF top-ups, and emissions compliance.

Get Your Depot Analysis

⏰ Grant Window closes 30 June 2026 — don't leave money on the table
70% diversity factor applied to peak demand. Grid capacity based on 3-phase 400V at 0.9 power factor. BESS energy sized to bridge power and energy gap. Installed BESS cost: £550/kWh. Grant: 70% of eligible costs, max £1m (April 2026). TOU saving based on your rate inputs. IRR calculated over 15-year BESS life. All figures indicative.