Generator Installation Arizona

Sizing is based on your actual running load — not your theoretical connected load. We start with a load profile analysis: what equipment must run during an outage, what can be shed, and what peak demand looks like under Arizona summer conditions. Oversizing wastes fuel and causes wet stacking on diesel units. Undersizing means the generator trips under load when you need it most. We provide a written sizing recommendation before any equipment is specified.

A straightforward installation — generator, ATS, fuel system, and interconnect — typically runs 2–5 days depending on site conditions, utility coordination requirements, and inspection scheduling. Larger projects with multiple units, switchgear, or complex load-shedding programs are planned in phases. We give you a realistic timeline before the project starts, not after equipment is on site.

An ATS monitors utility power and automatically transfers the protected load to generator power when utility fails — typically within 10 seconds for life-safety systems. Without an ATS, a generator is just an engine sitting outside; someone has to manually switch the load, which isn't viable at 2am during a storm outage. NFPA 99 and NFPA 110 mandate automatic transfer for healthcare and many other critical facilities. We install and commission ATS equipment from Cummins, Kohler, ASCO, and Russelectric.

Annually at minimum, with a full load bank test every 1–3 years depending on your compliance requirements. For Arizona facilities, we recommend inspecting air filters and cooling systems after every significant dust event, and running a no-load exercise test monthly. The starting battery — often overlooked — should be load-tested quarterly. Arizona heat degrades batteries faster than manufacturers' standard maintenance intervals account for.

Load bank testing connects a portable resistive load to the generator to verify it can sustain rated output under actual demand conditions. NFPA 110 requires load bank testing when monthly exercise runs don't reach 30% of nameplate rating for 30 minutes — which is common for generators sized well above their average load. We bring the load bank to your site and provide documented test results. For NFPA 99 healthcare facilities, this documentation is part of your compliance record.

Yes. We take over maintenance contracts for existing generators regardless of who installed them. We start with a baseline inspection — engine condition, ATS functionality, fuel system, battery, and control panel — document what we find, and build a PM program from there. We've inherited generators in every condition, including units that hadn't been exercised in years. Call 480-262-6505 or email Nikki@NewPhaseElectrical.com to discuss your facility.

Commercial generator installation costs depend on generator size (kW rating), fuel type, ATS complexity, pad and enclosure requirements, utility coordination, and permit fees. A complete standby generator installation — generator, ATS, fuel system, and interconnect — for a mid-size commercial facility in Arizona typically ranges from $15,000 to $80,000+. Large-scale projects with paralleling switchgear, multiple units, or load-shedding programming run higher. Generator repair and maintenance contract pricing is site-specific. We provide a written project quote after a site assessment — we don't publish flat rates because a 60kW natural gas unit on an existing pad is a very different project than a 500kW diesel installation on a new concrete pad with utility notification requirements.