Green retrofits for transit and trucks
A low-cost way to power HVAC, cut noise and emissions

The HVAC (Heating, Ventilation and Air Conditioning) system can consume more energy than driving the bus.

Installing a battery system to power the HVAC can cut emissions just as much as electrifying the drivetrain. We retrofit a lithium battery system into in-service diesel buses to electrify the HVAC system, making this the quickest, most cost-effective way to dramatically reduce emissions.

Microgreen can provide electrification for cabin HVAC or refrigeration systems in transport trucks.

Electrification can be provided for a range of other loads as well: emergency lights; lift gates; waste collection mechanisms; and many others.

HVAC Electrification End-to-End Solution for Public Transit

HVAC Electrification for Public Transit MPPT Solar Charger Controller Very Flexible Solar Panels

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Public Transit HVAC Current System

Public Transit HVAC Clean Energy System Microgreen Battery

Features & Benefits

  • Custom-designed systems to match any bus model
  • Modular battery systems scalable to fit your needs
  • Fast charging (1-2 hours) for a full recharge between morning and afternoon routes
  • Battery management system (BMS) and energy management system (EMS) for optimal safety and efficiency
  • Light and compact
  • Warranty - 2 years on materials & workmanship
  • Optional vehicle-mounted solar panels to supplement plug-in charging
  • Option to add remote monitoring for easier fleet management
  • Option to lease

Service Process

  1. Initial consultation
  2. Feasibility assessment: assess vehicle and devise a solution with a payback period under 4 years
  3. Prototype the proposed solution
  4. Install and test the prototype in customer vehicle
  5. Develop production systems and install in customer’s service fleet
  6. After-sales service
  7. Lithium battery recycling

Best Return on Investment

  • HVAC consumes just as much fuel as the propulsion system.
    • 30% - 80% of total transit vehicle energy, depending on outside temperature.
  • Usually powered by engine via an alternator, or a dedicated diesel generator.
  • Opportunity to significantly reduce emissions (~50%) on diesel or hybrid buses.
  • Better ROI vs electrifying propulsion:
    • Same savings on fuel and emissions
    • Lower capital cost

Easy Way to Reduce Emissions

  • Simpler to electrify HVAC:
    • Easy retrofit to in-service diesel buses./li>
    • Less regulatory complexity
    • Can be implemented in 4 months


  • The fastest and most cost-effective way to start reducing emissions right now
  • Low-risk investment