Rental transformers are stocked by the same yards that hire generators, and they are quoted by kVA: roughly $150 to $300 a day at 75 kVA and $400 to $600 at 500 kVA, with monthly rates near eight day rates. What decides whether the unit is any use is not the price but the voltage pair, because a transformer that steps the wrong direction between your supply and your load is a delivery you pay for and send back.
Say both voltages when you call
A yard needs the primary and the secondary: what is coming in and what the load wants. The common rental pairs are 480V to 208/120V for site power and distribution, and 208V up to 480V where a generator or a service does not match the equipment. A step-down unit will not step up unless it is specifically built to be reverse fed.
Sizing in kVA, with headroom
Total the connected load in kVA, allow for motor starting, and take the next size up in the fleet rather than the exact figure. Rental stock steps in familiar increments of 75, 112.5, 150, 225, 300 and 500 kVA, so there is little to gain from cutting it fine and a great deal to lose when the unit runs hot on a summer week.
Where it can be sited
Most rental transformers are dry-type units on a skid, rated for outdoor use and heavy enough to need a forklift or a truck with a crane. They need ventilation clearance on all sides, a level surface and a working space in front for the connections. Confirm the weight and the lifting arrangement before the truck is dispatched.
Who is allowed to connect it
The transformer arrives; the terminations do not. Primary and secondary connections, grounding and any changes to the temporary distribution are electrician work and are quoted separately from the hire. Yards will deliver and set the unit, and most will not energise it, so budget the electrical labour alongside the rate.
Questions people ask about transformer rental near me
How much does a rental transformer cost per month?
Monthly rates are usually close to eight day rates, so a 150 kVA unit that is $200 a day sits near $1,600 a month. Transformers are almost always monthly hires because they support a temporary service that lasts the length of a project.
Can a step-down transformer be used to step up?
Some dry-type units can be reverse fed but the taps, the inrush behaviour and the grounding all change, and it is not a decision to make from a rental listing. Ask the yard for a unit specified for the direction you need.
How many yards near me hire transformers?
Fewer than hire generators. Transformers sit mainly with the 4,123 machinery and power yards rather than general rental counters, so in a rural county the nearest stocking branch may be an hour out and the haul will reflect it.