BUSINESS CONTINUITY
Commercial
A generator that covers life safety but not tenant operations isn't protecting your building's performance or its reputation.
.png)
INDUSTRY
SERVICES
Commercial
Power that protects tenant operations and building performance.
Overview
Commercial buildings face power requirements driven by tenant type, not building size. A 5,000 sq ft restaurant needs 40–100 kW. A 5,000 sq ft office needs 25–75 kW. The gap between compliance-required systems and tenant-continuity systems is significant—and almost always invisible until an outage.
Requirements
Tenant load analysis by building type and occupancy mix
Generator sizing based on actual peak demand, not building footprint
Load bank testing under real operating conditions
Fuel system maintenance and quality management
Monitoring across single buildings and multi-property portfolios
Emergency response with building-specific system knowledge
Failure Points We See Most Often
Systems sized for life safety only—tenants lose power to refrigeration, IT, and operations
Fuel degradation: generators that sit for months without running develop contaminated fuel
No load testing: 'it turns on' is mistaken for 'it will perform under full building demand'
Transfer switch failures during the transition from utility to generator power
Portfolio inconsistency: some properties are current, others haven't been tested in years
CALCULATE YOUR POWER
Know exactly what it
takes to keep the lights on.
From essential backup to full-scale operations—get a clear, grounded recommendation based on how your property actually runs.
CRITICAL
A system that passes NFPA 110 inspection has met minimum compliance thresholds — not necessarily been tested under simultaneous Life Safety + Critical + Equipment branch demand.
PRODUCTION CONTINUITY / HEAVY LOAD
Commercial
Generator Sizing & Requirements
A system that passes NFPA 110 inspection has met minimum compliance thresholds — not necessarily been tested under simultaneous Life Safety + Critical + Equipment branch demand.
Required Transfer
≤ 10 sec
NFPA 110 Type 10 — utility loss to full generator output
Min. Fuel Supply
96 hrs
On-site minimum; extended for remote or high-risk facilities
Motor Startup Surge
2–3× load
AHUs, chillers & pumps spike at startup — sizing must absorb this
Diesel Shelf Life
6–12 mo
Without polishing — degraded fuel causes failure under load
Medical Clinic / Urgent Care
Basic life safety + exam rooms
20–100 kW
Surgical Center
OR, recovery, HVAC, life safety
100–300 kW
Community Hospital
Full 3-branch coverage
500 kW–1 MW
Regional / Large Hospital
Multiple generators, full redundancy
1–3 MW+
.png)
BEFORE YOU SPEC A SYSTEM
Frequently Asked Questions
What Drives the Right System in the
Commercial
Industry
FAQ 01
Q:
What causes most commercial generator failures?
A:
Most failures are preventable and happen for predictable reasons.
Common causes:
Fuel degradation or contamination
Dead or weak batteries
Lack of load testing
Cooling system issues
Transfer switch failure
Example:
A generator sits unused for months→ Fuel degrades or battery weakens→ System starts during a test→ Fails during an outage when full load is applied
What this means:
Generators often fail due to neglected small issues, not major breakdowns
Systems that appear functional may not perform when needed
Preventative maintenance and testing catch these issues early
Use a generator sizing calculator to ensure your system isn’t being pushed beyond its actual capacity during an outage
FAQ 02
Q:
How often should commercial generators be tested and maintained?
A:
Testing needs to reflect real-world conditions — not just basic startup checks.
Typical schedule:
Weekly or monthly exercise runs
Quarterly or semi-annual inspections
Annual load bank testing
What load testing actually does:
Simulates real demand (50–100% capacity)
Verifies the system can carry full load
Identifies issues that won’t show during idle testing
Example:
A generator that starts and runs fine with no load→ May fail within minutes when required to power HVAC, lighting, and operations simultaneously
What this means:
“It turns on” does not mean “it will perform”
Most failures happen under load, not during testing
Regular testing reduces the risk of failure during an actual outage
Use a generator sizing calculator to ensure your system is not only maintained — but correctly sized for real demand
FAQ 03
Q:
What does generator maintenance actually protect against in a commercial setting?
A:
Maintenance protects both the equipment and the operation it supports.
What maintenance includes:
Oil and filter changes
Battery testing and replacement
Fuel system inspection
Electrical and control system checks
Load testing
Example:
A retail center loses power:
With a maintained system → lighting, safety systems, and operations continue
Without maintenance → generator fails, tenants close, revenue is lost
What this means:
Maintenance is not just about equipment — it’s about operational continuity
The cost of downtime often exceeds the cost of maintenance
A maintained system protects:
Revenue
Tenant satisfaction
Safety and compliance
Use a generator sizing calculator to ensure your system supports the level of operation you expect during an outage
FAQ 04
Q:
Are backup generators required for commercial buildings?
A:
In many cases, yes — especially for systems tied to safety.
Where generators are typically required:
Emergency lighting systems
Fire alarms and suppression systems
Elevators (in certain buildings)
Exit signage and life safety systems
Examples:
Office building: Must maintain emergency lighting and fire systems during outages
Retail center:May require emergency lighting and tenant safety systems
Restaurant:Often not required for operations — but outages mean immediate revenue loss
What this means:
Code requirements cover safety, not business continuity
Many businesses install generators to protect:
Revenue
Tenant operations
Customer experience
Even if not required, a generator can prevent costly downtime
Use a generator sizing calculator to understand what it would take to keep your building operational during an outage
FAQ 05
Q:
How do I determine the right generator size for a commercial building?
A:
Generator sizing is based on actual load demand, not just building size.
Start by identifying:
Life safety systems (required): emergency lighting, fire alarms, elevators
Critical operations: IT, refrigeration, tenant systems
Optional continuity: full or partial building operations
Typical ranges:
Small commercial (retail/office): 20–75 kW
Mid-size buildings: 75–250 kW
Large facilities: 250 kW to 1 MW+
Most systems are sized using:
Peak demand (kW)
Startup loads from equipment
Future expansion needs
Two buildings of the same size can require very different systems depending on how they operate.
Example: 5,000 sq ft restaurant
Refrigeration: 3,000–6,000W
Kitchen equipment (ranges, fryers, ovens): 10,000–30,000W+
HVAC: 5,000–10,000W
Lighting + POS systems: 1,000–3,000W
⚡️ Typical generator need: 40–100 kW
Example: 5,000 sq ft retail store
Lighting: 2,000–5,000W
POS systems + electronics: 500–1,500W
Basic HVAC: 3,000–8,000W
⚡️ Typical generator need: 20–50 kW
Example: 5,000 sq ft office
Lighting: 2,000–4,000W
Computers + servers: 2,000–6,000W
HVAC: 4,000–10,000W
⚡️Typical generator need: 25–75 kW
INDUSTRY
SERVICES
INDUSTRY
SERVICES
Explore Additional Generator Solutions
Backup power isn't one-size-fits-all. Different facilities have different demands, uptime requirements, and growth plans.
Explore additional Kohler generator models below, or reach out to our team for guidance on selecting the right solution for your site.
Related Products
BEFORE YOU SPEC A SYSTEM
Frequently Asked Questions
What Actually Matters in
Commercial
.png)