The short answer: a quality phase converter costs between $749 and $14,780 depending on type, size, and features. The long answer — which is what you actually need to make a smart purchasing decision — involves understanding what drives the cost, what you're really paying for, and how a converter compares to the alternatives over its lifetime.

This guide uses real, published prices from our current product line. No "call for pricing" games.

Quick Answer: Phase Converter Pricing by Type

NL Series (Standard Rotary) — Detailed Pricing

The NL Series is our workhorse line. These are purpose-built rotary phase converters designed for shops, farms, and light manufacturing. They deliver reliable three-phase power with 3-5% voltage balance — more than adequate for motors, compressors, welders, and most shop equipment.

PL Series (Premium Rotary) — Detailed Pricing

The PL Series uses heavier-duty construction, larger capacitor banks, and enhanced voltage regulation circuitry. The result is tighter voltage balance and better performance under demanding or fluctuating loads. This is the go-to choice for CNC machines, woodworking shops, and applications where power quality directly impacts work quality.

The PL premium is typically 12-20% over the NL at any given HP rating. For CNC operators, that premium is a no-brainer — the improved power quality prevents error codes, reduces tool chatter, and extends spindle bearing life.

DualZone Digital Phase Converter — Detailed Pricing

The DualZone is our digital/electronic phase converter line. It uses DSP-controlled power electronics to synthesize a near-perfect third phase with 1-2% voltage balance. It also features built-in diagnostics, voltage monitoring, and fault protection.

Installation Costs

The converter itself is only part of the investment. Professional installation by a licensed electrician is required for safety and code compliance. Here's what to budget:

For detailed installation planning, see our Phase Converter Installation Guide.

What Affects Installation Cost

• Distance: The farther the converter from your equipment panel, the more wire and conduit. Copper isn't cheap — a 100-foot run of 4 AWG wire (typical for 20 HP) costs $200-400 in materials alone.
• Panel capacity: If your existing single-phase panel doesn't have room for the converter's breaker, you need a panel upgrade ($800-2,000).
• Number of circuits: Each machine needs its own circuit from the three-phase sub-panel. More machines = more labor and materials.
• Local labor rates: Electrician rates vary from $65-150/hour depending on region. Get at least two quotes.

Total Cost of Ownership (10-Year View)

A phase converter is a long-term investment. Quality rotary converters last 20-30 years with minimal maintenance. Here's what the total picture looks like for a typical 20 HP setup:

The maintenance costs for rotary converters consist primarily of capacitor replacement (every 10-15 years, $100-300) and bearing replacement if needed. Digital converters have virtually no mechanical maintenance — the power electronics are solid-state.

Phase Converter vs. Alternatives: Cost Comparison

How does a phase converter investment compare to the other ways of getting three-phase power?

VFDs can be cost-competitive for 1-2 motor setups. But once you have 3+ machines or any non-motor loads, the economics tip decisively toward a phase converter. And the utility option only makes sense when three-phase infrastructure is already nearby. For a deeper dive on this comparison, see our guide: How to Convert Single Phase to Three Phase Power.

What Size Do You Need?

The right size depends on your specific equipment and usage patterns. Here are common scenarios with recommended sizes and costs:

Not sure about sizing? Our sizing guide walks through the calculation, or call us and we'll size it for you in 5 minutes.