Positive Wiring — Commercial Electrical & Backup Power Specialists Serving Philadelphia, Bucks County, Montgomery County, South Jersey & Northern Delaware
Power outages in the Delaware Valley are common. Summer storms, winter freezes, nor’easters, and aging infrastructure make a commercial backup generator essential for business continuity. Whether your facility is in Philadelphia, Yardley, Princeton, Cherry Hill, Wilmington, or anywhere across PA, NJ, and DE, choosing the right‑sized generator is critical. Too small, and it shuts off under load. Too big; it wastes fuel, increases operating costs, and shortens equipment lifespan.
This guide explains how to size a standby generator correctly — tailored to the realities of the Delaware Valley.
1. Identify What Must Stay Powered
Start by defining your critical loads:
Safety & Required Systems: Emergency lights, exit signs, fire alarms, fire pumps, egress elevators.
Business‑Critical Systems: Internet, servers, refrigeration, security, payment systems, essential equipment.
Optional Comfort Loads: Office lighting, general outlets, full HVAC.
Most organizations across Philadelphia, Bucks County, Montgomery County, Delaware County, Chester County, South Jersey, and Northern Delaware prioritize the first two categories to stay operational without overspending.
2. Understand Your Building’s Power Use
Every device has two types of electrical demand:
- Running power — normal operating load
- Starting power — a brief surge when motors kick on
A properly sized generator accounts for:
- Total running load
- The largest motor’s startup surge
- A safety buffer so the generator isn’t operating at its limit
Positive Wiring performs this on‑site load analysis for commercial buildings, schools, nonprofits, and industrial facilities across PA, NJ, and DE.
3. Delaware Valley Weather Changes the Math
Our region’s climate directly affects generator performance:
Hot Summers: Engines lose output in high heat; rooftop units draw more power.
Cold Winters: Diesel can gel, batteries weaken, and enclosures may require heaters.
Storm‑Driven Outages: Outages often last hours or days. Fuel supply and automatic transfer switches matter as much as generator size.
These factors are especially important for facilities in Philadelphia, South Jersey, and Wilmington, where multi‑day outages are more common.
Generic online calculators don’t account for these conditions. Positive Wiring does.
4. Choose the Right Fuel Source
Each fuel type behaves differently in our climate:
Natural Gas: Reliable for long outages; gas meter must be properly sized.
Propane: Ideal where natural gas isn’t available; tanks must support multi‑day runtime.
Diesel: Strong performance; most sensitive to winter conditions.
There’s no universal “best”; the right choice depends on your building, location, and outage expectations.
5. Follow Safety Standards
Commercial generators must meet National Electrical Code (NEC) and National Fire Protection Association (NFPA) standards to ensure life‑safety systems stay powered and equipment is installed correctly:
- NEC 700: Emergency systems
- NEC 701/702: Standby systems
- NEC 708: Critical operations
- NFPA 110: Installation & testing requirements
Positive Wiring handles all code compliance across Pennsylvania, New Jersey, and Delaware.
Why Professional Sizing Matters
Generator size, fuel type, transfer switch, and wiring all work together. One wrong choice can take the entire system down during an outage.
Positive Wiring provides:
- On‑site load analysis
- Fuel‑source planning
- Transfer switch installation
- Full electrical integration
- Permitting, commissioning, and testing
All backed by our Lifetime Wiring Warranty — the strongest in the region.
Bottom Line
A generator is only as reliable as the math behind it and the climate assumptions built into it. For a system sized correctly for the Delaware Valley, trust a licensed team that understands local weather, local codes, and local grid behavior.
Call Positive Wiring at 267‑348‑1947 or visit PositiveWiring.com to schedule a free consultation. Stay Positive!