What Bus & Coach Parking AC Battery Covers
Bus and coach parking AC draws 2–3 kW per vehicle — far above truck-cabin loads — and idle fuel alone costs ¥150–200 per night. This page covers PLB's 25.6 kWh eight-pack LiFePO₄ bank: 8 hours at full load, GB 38031 vehicle-grade safety, parallel expansion for larger fleets and centralized off-peak charging, with a payback under one year for a 200-bus operation.
Professional Battery Solutions
3kW —— Coach AC 3kW — How Big a Battery Bank? Systematic Solution, Not One Battery
Coach parking AC at 2–3kW needs 16-24kWh for 8 hours overnight. Not solvable by adding one battery — requires systematic bank solution (parallel units + unified BMS + charging strategy optimization). Many bus companies tried "add one big battery" approach — insufficient capacity, uneven charging, BMS chaos — eventually gave up. Bus parking battery requires "systems engineering" thinking.
Systematic solution ensures stable 3kW AC for 8 hours. PLB LL-PC250 (12V 250Ah/3.2kWh) × 8 parallel = 25.6kWh total. Under-floor mounting, unified BMS management. Alternator charging + depot overnight charging. 3-year TCO 70%+ lower than idling.
| Idling engine | PLB system | |
|---|---|---|
| Nightly energy cost | ¥150–200 | ¥0 |
| Annual cost over 300 days | ¥45,000–60,000 | ¥0 |
| Engine wear | Severe idling wear | Zero |
| 3-year total | ¥135,000–180,000 | About ¥60,000 |
—— Bus Battery Regulations Strict — Non-Compliant Batteries Can't Enter Vehicle Catalog
The pain is specific: —— Bus Battery Regulations Strict — Non-Compliant Batteries Can't Enter Vehicle Catalog In daily operation, lead-acid or manually managed packs lose capacity between scheduled checks, maintenance teams cannot inspect every unit, and the failure surfaces only when the load is already at risk.
Automotive-grade compliant — zero catalog, inspection, or recall risk. PLB's LiFePO₄ pack and BMS monitor cell voltage, temperature and SOC continuously, alert before a weak cell becomes a failure, and are sized to the application's load profile.
| Conventional / manual | PLB LiFePO₄ | |
|---|---|---|
| Monitoring | Periodic checks | Continuous BMS |
| Fault warning | At failure | Threshold alerts |
| Maintenance | Scheduled visits | Exception-based |
| Service life | 2–3 years | 6,000+ cycles |
30-50% —— + 200-Vehicle Fleet Charging — How to Save 30-50% on Electricity? Off-Peak + Smart Scheduling
50-200 buses need centralized overnight charging without management — undercharge, overcharge, queue chaos, peak-rate costs (peak ¥1.2-1.5/kWh vs off-peak ¥0.3-0.5/kWh). Peak vs off-peak 3-4× difference — 200-bus fleet annual electricity price difference can reach ¥500K-1M. Critical: uneven charging causes some batteries overcharged, shortening life, increasing maintenance costs.
Off-peak auto-charging + smart scheduling = 30-50% electricity savings + extended battery life. PLB smart charging + BMS communication: real-time monitoring, automatic priority (depleted first), off-peak auto-scheduling. Backend visualizes entire fleet battery status. Scientific management extends battery life 20%+.
| Unmanaged | PLB central management | |
|---|---|---|
| Charge sequencing | Unmanaged | Smart sequencing |
| Tariff strategy | Peak charging | Off-peak |
| O&M | Cart-by-cart checks | Dashboard visibility |
| Battery life effect | Shortened by overcharge | Extended 20%+ |
¥960 —— ROI 200 Buses Burn ¥9.6M in Idle Fuel — ROI Makes Perfect Sense
200 buses × 20L diesel × ¥8/L × 300 days = ¥9.6M annual idle fuel. Adding engine wear, actual comprehensive cost exceeds ¥12M/year. Buried in total operating costs — many bus company CEOs don't know idling costs this much. But saving this money = pure profit — for listed companies, directly impacts EPS.
¥6M investment, payback <1 year, net savings ¥10M+ in 2 years. All 200 buses retrofit (200 × ¥30K = ¥6M). Annual savings: ¥9.6M idle fuel + ¥2M maintenance = ¥11.6M. 5-year TCO net savings ¥50M+. Clear ROI, highly certain returns — one of the best investments for bus companies.
| Idling engine | PLB system | |
|---|---|---|
| Annual idle fuel | ¥9.6M | ¥0 |
| Annual engine servicing | ¥2M+ | ¥2M+ saved |
| Battery investment | — | About ¥6M |
| Payback | — | Under 1 year |
Solution Advantages
Scalable Bank
250Ah per unit, 25.6kWh+ bank
Banks start at 250Ah and parallel up to eight packs for a 3kW air conditioner over a full shift, with unified BMS balancing across the bank.
Eight packs in parallel, 25.6 kWh · 8 h at full load · Unified BMSAuto-Grade
GB 38031 / GB/T 31484
Vehicle-grade A-class cells and BMS pass GB 38031 with a complete type-test report and 3C certification, so vehicles stay legally compliant.
GB 38031 passed · 3C certified · Zero annual inspection riskOff-Peak
Smart scheduling, 30-50% savings
Smart charging with BMS communication fills the bank in the off-peak window, cutting electricity cost by 30–50% and prioritising the most depleted packs.
30–50% cheaper off-peak charging · Smart sequencing · Dashboard visibility1 Fast ROI
¥6M investment, ¥10M+ in 2 years
A 200-bus fleet invests about ¥6M and saves ¥11.6M a year: payback in under a year and more than ¥50M saved over five years.
¥11.6M saved a year · Payback under 1 year · ¥50M+ over 5 yearsFrom Selection to After-Sales — PLB Stays With You
Four commitments that apply to every page in this category, from the first technical question to long-term support.
Technical Selection Support
Engineer recommends within 24 hours
Tell us the air-conditioner rating, nightly hours and battery-box dimensions — our engineers size the pack and recommend the matching model within 24 hours.
Dedicated technical team · 24-hour response
OEM / ODM Customization
From cell to cabinet, fully customizable
From cells, BMS, housing and terminals to the nameplate, everything can be customized.
4–8 week customization · Tooling development supported
Global Shipping
Export to 100+ countries
Export-compliant packaging with UN 38.3 air transport certification and worldwide delivery.
UN 38.3 certified · MSDS available · Export compliant
Warranty & Support
Standard warranty, lifetime support
Standard products carry a full warranty, backed by lifetime technical support.
Warranty terms on request · Lifetime technical supportWhy Choose PLB?
Years of Manufacturing
Founded in Dongguan, China in 2014
Countries Served
Export-compliant packaging and worldwide delivery
Voltage Platforms
From 25.6V to 512V, built on the same cell platform
After-Sales Rate
Monitored by the internal quality traceability system
Full Range & Model Selection
Complete product range and model selection — compact 12V packs for light trucks, 24V packs for long-haul and heavy trucks, plus cold-chain and industrial versions.
| Model | Voltage | Capacity | Form factor | Applications |
|---|---|---|---|---|
| LL-PC150 | 12V | 150Ah | Compact drop-in, 1/3 the volume | Light delivery trucks |
| LL-PC200 | 24V | 200Ah | 8–10 h AC runtime, 2,000A start | Long-haul trucks |
| LL-PC250 | 24V | 250Ah | Sustained 1C, cold-chain ready | Heavy trucks · reefer |
| LL-PC200D | 24V | 200Ah | Industrial sealed version | Construction machinery |
| LL-PC200-CL | 24V | 200Ah | Cold-chain version, −30 °C | Refrigerated transport |
By vehicle: light delivery truck → LL-PC150.
By duty: overnight rest only → 200Ah.
Not sure? Send us the air-conditioner rating, nightly hours and battery-box dimensions — our engineers will size the pack directly.
Frequently Asked Questions
The questions fleet managers and truck owners ask most about LiFePO₄ parking-AC batteries in the Buses & Coaches scenario — <1 year (payback), and what it takes to qualify.
Will a PLB pack replace the lead-acid unit in the Buses & Coaches scenario without rework?
The pack fits the original battery box at the same 12 V or 24 V system voltage with the same terminal layout, so no bodywork change is needed. Typical models for Buses & Coaches builds are LL-PC250 ×8 parallel and LL-PC250 (vehicle grade).
What runtime and output can we expect over a rest period in the Buses & Coaches scenario?
The pack runs the air conditioner through the rest period without idling the engine, and deep-cycle life replaces the one-year lead-acid replacement cycle.
What temperature and ingress rating is specified for the Buses & Coaches scenario?
The sealed pack is rated for engine-bay heat and road vibration, with BMS protection against over-current and over-temperature.
Can the pack report SOC and alarms to monitoring already used in the Buses & Coaches scenario?
The BMS reports SOC and protection status, with an optional display or app for the driver.
Which models cover the Buses & Coaches scenario, and how is delivery handled?
Typical models are LL-PC250 ×8 parallel and LL-PC250 (vehicle grade). Custom packs take 4–8 weeks including tooling, and lead time for standard models is confirmed on the quotation. Tell us the air-conditioner rating, nightly hours and battery-box dimensions — our engineers size the pack and recommend the matching model within 24 hours.
Need a Selection Recommendation?
Tell us the load, backup time and installation space — our engineers will recommend the matching battery within 24 hours.
NDA available upon request · Typical response within 12 hours