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.
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.
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Van
Up to 3.5t electric van · ~50 kWh per session
0
🚛
Rigid HGV
7.5t–18t electric rigid · ~130 kWh per session
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Articulated HGV
26t–44t electric artic · ~260 kWh per session
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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)
100 kW
20 kW500 kW
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
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kW (with 70% diversity)
Grid Supply Available
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kW from your DNO
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Analysing...
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Peak Demand
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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)
Your Net Investment
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After 70% Depot Charging Scheme grant
Your return on investment
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Simple Payback
Based on annual TOU saving
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Estimated IRR
Over 15-year BESS life
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Lifetime Net Saving
TOU saving over 15 years minus net investment
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Annual TOU Saving
Ongoing benefit each year
Payback is based on TOU electricity arbitrage saving. Additional value from avoided DNO grid upgrade (typically £50k–£500k+) makes the case stronger still — ask us for a site-specific estimate.
🏦
Don't forget: the Depot Charging Scheme covers 70% of eligible costs (chargers + civil works + BESS), up to £1 million per company. Window 1 closes 30 June 2026 — works must complete by 31 March 2027. We'll help you confirm eligibility and structure your application.
🚚 Busting the myths about going electric
"Our grid can't handle it."
That'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.
"Installation takes too long."
Allye BESS systems are mobile and can be operational within days of delivery. Charger installation typically takes 1–3 weeks depending on civil works. Grid upgrades, by comparison, can take 6–18 months.
"Electric HGVs can't do the range."
For most UK distribution and last-mile operations — typically under 200 miles per day — current electric HGVs are fully capable. Range is only an issue for long-haul trunking, and battery density improvements are making this gap close every year.
"We can't charge vehicles if they don't all come back at the same time."
The BESS acts as a buffer. It charges slowly when vehicles are out, stores energy, then delivers high power to whichever vehicles return. Dynamic load balancing across charge points means you always have power available, regardless of return schedule.
"BESS is just another piece of equipment to maintain."
LFP battery 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 a fleet of diesel trucks with their service costs, DEF top-ups, and emissions compliance.
Get Your Depot Analysis
Fill in your details and we'll confirm your grant eligibility, accurately size your system, and give you real numbers — free of charge.
⏰ Grant Window 1 closes 30 June 2026 — don't leave money on the table
✅ Done. The team will be with you within one working day.
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.