Commercial Generator Installation in Myrtle Beach, SC
Most small commercial accounts land in the 20 to 30kW range, running $8,000 to $22,000 fully installed, though the real number depends on occupancy load, refrigeration or life-safety equipment, and whether the building runs three-phase service.
Standard scheduling runs during regular business hours. Ahead-of-storm-season demand books out early — see the hurricane prep guide for timing.
What size generator does a small business actually need?
Installed cost for commercial systems is usually figured at roughly $300 to $600 per kW rather than a flat price, because permitting, load calculation and electrical integration cost close to the same whether the generator itself is small or large.
What changes
What's Different About a Commercial or Rental-Property Install?
Load calculations get more involved. A restaurant's walk-in coolers, a medical or dental office's refrigerated supplies and equipment, or an office building's server room each have a different profile than a house, and code sometimes classifies part of that load as legally required standby rather than optional backup.
Three-phase service shows up more often in commercial buildings than residential ones, and it changes both the generator and the transfer switch specification, not just the price.
The buyer is different, too, and not in a small way. A short-term-rental owner is a homeowner making an absentee-owner decision; a property-management company running a portfolio of rental units is a business buyer evaluating uptime, liability exposure and whether one generator can reasonably back up multiple units on the same property. That's a scoping conversation, not a standard residential quote.
Not every small business needs a full commercial standby install. A shop with light refrigeration, no walk-in cooler and no code-mandated life-safety load can sometimes get by on a portable generator and a manual transfer switch at a fraction of the cost, as long as someone on staff is trained to run it safely during business hours.
What you get
What's Included in a Commercial Install?
- Commercial load calculationAccounts for refrigeration, life-safety systems, and occupancy-driven electrical code requirements, not a residential rule of thumb.
- Three-phase generator and switchgear where requiredSized and specified for the building's actual service type.
- Code classification reviewDetermines whether any portion of the load is legally required standby power under applicable code, which changes design requirements.
- Permit and inspectionFiled with the jurisdiction covering the property, coordinated with the business's operating schedule where possible.
- Startup, load-bank testing and commissioningVerified under real or simulated load before the system is signed off.
Step by step
How Does a Commercial Project Get Scoped and Installed?
Site assessment and load calculation
Time on site · 1-2 hoursReviews electrical service, occupancy classification, and any legally required standby load.
Equipment selection and quote
Time on site · several daysGenerator and transfer switch specified to the load, with a written price.
Permit filed
Time on site · 1-4 weeks, scope-dependentElectrical and any mechanical or gas permit filed with the correct jurisdiction.
Installation
Time on site · 2-5 days, scope-dependentPad, electrical, fuel connection and switchgear installed, scheduled to minimize disruption to business operations where possible.
Commissioning and load-bank test
Time on site · half a daySystem tested under real or simulated load before final sign-off.
A commercial backup power system sized to your actual load and code classification, tested before it's ever needed for real.
What it runs
What Does Commercial Generator Installation Cost?
| Item | Typical price |
|---|---|
| 20-30kW small business system, installed / installedTypical range for a restaurant, small office, or single rental property. | $8,000-$22,000 |
| 75-100kW system, installed / installedLarger commercial buildings, medical offices, or multi-unit properties. | $35,000-$75,000 |
| Installed cost per kW, general estimate / per kWFixed costs like permitting and electrical integration don't shrink with generator size, so smaller systems cost proportionally more per kW. | $300-$600/kW |
| Three-phase switchgear premium / add-onQuoted specifically once service type and load are confirmed. | varies by amperage |
These are typical ranges for Grand Strand; your exact price depends on load calculation results, code classification, and site conditions.
Commercial quotes are scoped individually more than residential ones — these ranges are a starting point for budgeting, not a substitute for a site visit.
Straight answers
What size generator does a small restaurant or office actually need?
Most small commercial accounts land in the 20 to 30kW range, though refrigeration load, life-safety systems and occupancy type all affect the final number more than square footage does.
Do you install three-phase commercial generators?
Yes, sized and specified to the building's actual electrical service, which is a different scope than a residential single-phase system.
Can one generator back up multiple rental units on the same property?
Often, depending on the property's panel layout and total load. That's confirmed during the site assessment, since it changes both the generator size and the transfer switch design.
How much does commercial generator installation cost?
A typical small-business system runs $8,000 to $22,000 installed; larger commercial buildings can run $35,000 to $75,000, with installed cost generally figured around $300 to $600 per kW.
Do you offer service contracts for commercial accounts?
Yes, structured similarly to residential maintenance plans but scaled to commercial equipment and, where applicable, load-bank testing requirements.
Locked in.
Book it before the forecast turns.
Commercial jobs get scoped individually. A site visit gets you an accurate number instead of a rough per-kW estimate.
Call it in or send the details — a real quote comes back either way.