Roof-Mounted Retrofit

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Project

Roof-Mounted Retrofit – Kohler KD1650 Generator with KD45V20 Engine

Engine Size

1650 kW

Sector

Mission-Critical / Infrastructure

Project Overview

This large-scale retrofit involved 60 Kohler KD1650 generator sets powered by KD45V20 engines. The project’s main requirements included achieving 95% NOx reduction, maintaining acoustic levels under 65 dB(A) @ 1m, and fitting a compact SCR solution into a rooftop installation.

Solution Provided

E.I. Williams/IMS  modular SCR system are pre-wired and pre-mounted on a single skid with integrated silencers for ease of installation. As a result, the solution required only electrical and communication connections, streamlining the installation process. DEF tanks were strategically positioned alongside the fuel tanks, optimizing the rooftop space.

System Specification

Generator
Kohler KD1650
Engine
KD45V20
NOx Reduction Requirement
≥ 95%
Noise Target
Noise Target: ≤ 65 dB(A) @ 1m
Installation Constraints
Installation Constraints: Rooftop, limited footprint
DEF Tank Placement
DEF Tank Placement: Beside main fuel tank
Connectivity
Connectivity: Power + CanBus signal
Access
Access: Swing gates, protective rails, removable lid for catalyst inspection

Visual / Instalation Photos

Results & Impact

NOx Reduction Achieved
98%
Noise Level 
< 65 dB(A) @ 1m
Installation Time
Fast-track installation due to simplified hook-up
Serviceability
Easy catalyst inspection with dedicated access hatch
Safety
Maintenance-safe with rails and swing gates included

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