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Battery Charging Facility — Sizing Calculator | Spexal
Internal Planning Tool
Facility Sizing Calculator

Battery Charging Facility

Fill in all parameters below to calculate the exact number of chargers and storage locations needed. Results update automatically as you type.

How to use this calculator:
  1. Enter your facility parameters — charge time, number of docks, pallet size, and operating hours.
  2. Enter your truck schedule and your daily target. The calculator will verify whether they are consistent.
  3. Set your safety buffers (recommended: 20% on chargers, 30% on storage).
  4. Results appear at the bottom and update live as you type.
01 Facility Parameters Known constraints of your facility
How long does one battery take to fully charge?
⚠ Please enter a number between 0.5 and 24
hours
How many batteries fit on one truck pallet?
⚠ Please enter a whole number between 1 and 100
batteries / pallet
How many truck docking bays does the facility have?
⚠ Please enter a whole number between 1 and 50
docks
How many hours per day is the facility active? (Enter 24 for continuous operation)
⚠ Please enter a number between 1 and 24
hours / day
02 Demand Inputs Enter all three — we'll cross-check them for you
A truck arrives at each dock every X hours, dropping empty batteries and picking up full ones
⚠ Please enter a number between 0.5 and 24
hours between arrivals
How many pallets of empty batteries does each truck bring in per visit?
⚠ Please enter a whole number between 1 and 20
pallets / truck visit
How many batteries does the client need charged per day?
⚠ Please enter a whole number between 1 and 50,000
batteries / day
03 Safety Buffers Recommended: 20% chargers · 30% storage
Extra chargers above the bare minimum — covers maintenance, downtime, and demand peaks
⚠ Please enter a percentage between 0 and 200
% above minimum
Extra storage slots above minimum — covers delays, pickup timing, and surge arrivals
⚠ Please enter a percentage between 0 and 200
% above minimum
Results — updates as you type
Please fix the highlighted fields above — results cannot be calculated until all inputs are valid.
Chargers needed
including buffer
Storage locations
including buffer
Truck throughput
batteries / day from schedule
Truck arrivals / day
across all docks

Calculation breakdown
Truck arrivals per day (all docks)
Batteries delivered per truck visit (per dock)
Batteries delivered per day from truck schedule
Charging cycles per charger per day
Minimum chargers required (no buffer)
Batteries on chargers at peak
Queue waiting for a charger at peak
Fully charged batteries awaiting pickup
Minimum storage required (no buffer)
Charger utilization at buffered count
Min chargers
bare minimum
Min storage
bare minimum
Charger utilization
at buffered count
Daily target
client stated