A restoration shop off Highway 6 in Iowa City called us in the middle of a frame-off project because their new 2 post car lift arrived on a Tuesday and the electrician couldn’t get there until the following week — and nobody had told him whether the power unit was single-phase or three-phase, or what breaker to pull. That delay cost them a week of billable bay time on a car that was already behind. It happens constantly. People spend six weeks agonizing over capacity and arm geometry and then treat the electrical as an afterthought, when it’s the one thing that will absolutely stop an install cold. Here’s how we walk restoration and alignment shops through the decision, from budget down to the wire in the conduit.
Rotary and Challenger commercial units, BendPak and Atlas for smaller shops. Tell us your panel — 208V three-phase, 240V single-phase, or 110V only — and we’ll spec the right power unit before it ships.
Step One: Start With the Panel, Not the Catalog
The first question we ask a restoration shop isn’t what they want to lift. It’s what’s in the electrical panel. That one answer eliminates half the catalog immediately and saves everybody a lot of backtracking. Older Iowa City commercial buildings — especially the converted warehouses and former dealership service bays around the Gilbert Street and Riverside corridors — are all over the map. Some have 208V three-phase service from a previous industrial tenant. Some have 240V single-phase and nothing more. A handful of small independent shops operating out of what used to be a residential garage have 110V and a 100-amp main, which is a real constraint.
If you have three-phase available, take it. Three-phase power units are smoother, they draw less current per leg, they start under load without the voltage sag you get from a single-phase motor, and on a busy alignment bay running twenty-plus cycles a day, they last longer. If you only have single-phase, that’s fine — every major manufacturer offers a single-phase power unit and they work well in a shop doing moderate volume. What you should not do is order the wrong one and try to sort it out after delivery. Power units are model-specific and swapping one is a parts order plus labor, not a five-minute fix. Confirm phase, voltage and available amperage before the purchase order goes out.
Single-Phase Reality: 208-230V and a Dedicated Circuit
Most single-phase two post units run a 2 or 3 horsepower motor at 208-230V, and the manufacturer will call for a dedicated 30-amp circuit. Not shared. Dedicated. We have seen shops tie a lift into a circuit already carrying a compressor, and the result is nuisance breaker trips every time both start at once, plus a motor that runs hot and dies early. The startup inrush on a hydraulic power unit is substantial — it’s lifting a stationary load from dead stop — and that surge is what trips shared circuits.
Wire gauge matters more than people expect because of run length. A 30-amp circuit on 10 gauge is fine for a short run, but if your panel is 90 feet from the bay — common in a long narrow restoration shop where the panel is by the office and the lift is at the back — voltage drop starts to matter and you should step up to 8 gauge. Have your electrician actually calculate it rather than defaulting to 10. Undervoltage at the motor is a slow killer: the unit still works, it just runs hotter and slower every year until the windings give up. We’ve replaced power units on five-year-old equipment that should have gone fifteen, and the cause was almost always a long undersized run. Get this right once and a single-phase 2 post car lift will outlive the shop lease.
Three-Phase for High-Cycle Alignment Work
Alignment work changes the duty cycle math. A restoration shop that also does alignments is cycling the lift far more than a general repair bay — up, down, up again for toe adjustment, back down for a road test, up again. Add in the fact that alignment often happens at the end of a long build when everything else is done and the customer is waiting, and you get concentrated bursts of heavy use.
Three-phase power units handle that better. Typical spec is 208-230V three-phase on a 20-amp circuit, or 460V three-phase on a smaller breaker if you have it. The motor runs cooler, starts more gently, and there’s no start capacitor to fail — which is worth knowing, because a failed start capacitor is one of the more common single-phase service calls we run. A shop owner calls and says the motor hums but the lift won’t go up; nine times out of ten it’s a capacitor or a contactor, not the hydraulics. That said, we also field calls where the motor runs fine, fluid level is good, no leaks, and the lift still won’t rise — that’s usually a check valve, a lowering valve stuck open, or air in the system, and it has nothing to do with the electrical. Knowing which category your problem falls into saves diagnostic time. If you’re running a high-volume 2 post car lift in an alignment bay and three-phase is available in the building, spend the money to bring it to the bay.
The 110V Question and When It Makes Sense
Every few weeks somebody asks whether they can run a two post on standard 110V household power. The honest answer is: sometimes, with caveats. A few manufacturers offer 110V power units on lighter-capacity units, generally 9,000 lb and under. They lift noticeably slower — figure 60 to 90 seconds to full height instead of 40 — and they pull hard enough on startup that they need a dedicated 20-amp circuit with nothing else on it.
For a hobbyist or a one-man restoration operation putting a car up two or three times a week, that’s completely workable. For a shop billing alignment hours, it isn’t. The slower cycle time compounds across a day and the motor is working near its limit every single lift, which shortens its life. Our general advice: if you’re running a business, find a way to get 220V to the bay. An electrician pulling a new circuit from an existing panel in a typical Iowa City shop building is a manageable expense in the several-hundred to low-four-figure range depending on distance and whether conduit already exists. That’s small next to the cost of the equipment and tiny next to the cost of a slow bay. Spend it. We’d rather sell you a properly powered unit than a 110V model you’ll be frustrated with by month three.
Budget Tier to Configuration: How the Decision Tree Actually Runs
Here’s the sequence we use on the phone. First, budget band — entry, mid, or commercial. Entry-tier value-brand units in the four-figure range make sense for hobby and low-volume storage use. Mid-tier BendPak and Atlas equipment suits a small independent shop. Commercial Rotary and Challenger units are what belong in a shop doing daily alignment and restoration work, and they’re priced accordingly, generally in the upper four figures to low five figures installed depending on capacity and options.
Second, capacity. Most restoration work lives comfortably under 10,000 lb, but if you’re pulling frames on three-quarter-ton trucks, step to 12,000 or 15,000. Third, overhead versus baseplate, driven entirely by ceiling height at the column locations. Fourth, symmetric versus asymmetric — restoration shops with doors coming on and off constantly usually want asymmetric so the cabin clears the posts. Fifth and finally, electrical. By the time you get here the model list is short, and picking single-phase or three-phase is straightforward. Running the tree in that order matters, because if you start with electrical you’ll narrow yourself into a model that doesn’t fit the ceiling. Every step constrains the next. When shops call us mid-project having already bought a 2 post car lift that doesn’t match their building, it’s almost always because they skipped a step.
Concrete, Anchors and the Rest of the Install Checklist
Electrical gets the attention in this article, but concrete is what actually holds the load. Manufacturers want a minimum of four inches of 3,000 PSI slab, and for a 12,000 or 15,000 lb commercial unit you’ll often see six inches specified. Iowa City shop floors vary wildly, especially in buildings that have been re-purposed two or three times. Drill test holes at both column locations before you commit. If the slab is thin, cutting and pouring dedicated footing pads is standard practice and not particularly expensive.
Beyond concrete and power, the install checklist is short but non-negotiable: verify column plumb with a level before final torque, torque anchors to the manufacturer’s printed spec and re-torque after the first several cycles, set equalization cable tension so both carriages rise together, bleed the hydraulic system completely, and cycle the lift empty three or four times before putting a vehicle on it. Then test the lock engagement at multiple heights. We do all of this on every install we run, and we walk the shop owner through it so they know what normal sounds like. Once it’s in, plan on an annual inspection — ALI recommends it, most commercial insurance policies effectively expect it, and it catches worn cables and cracked arm restraints before they matter. For more, see our pieces on what we check during an annual lift inspection and troubleshooting a two post lift that won’t raise. Call us at 800-674-9302 with your panel specs and ceiling height and we’ll get you to the right model quickly.
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