What Power Questions Should You Ask About a Reefer?

Treat power as a feasibility question

A reefer may be physically deliverable to a site while the electrical supply there remains unsuitable. Resolve both questions independently before setting a delivery date. Refrigeration is an active load: it requires a compatible supply and dependable operation, not simply an outlet somewhere nearby. If power is interrupted, the refrigeration system may stop even though insulation slows heat transfer. That delay varies with unit condition, loading, ambient conditions, and how often doors open; it is not a guaranteed safe holding period.

Power is only one decision within the larger refrigerated-container rental planning framework, which also covers inventory, monitoring, placement, and contingency.

Start by collecting the exact information for the proposed unit. Ask for its make and model, an image or transcription of the electrical nameplate, the manufacturer's installation and operating instructions, and any supplier requirements for the hookup. Mobile-Stor currently describes its reefer requirement as 460-volt, three-phase power, but the actual assigned unit and connection details must be confirmed directly. Do not treat a broad webpage specification as a substitute for unit-specific documentation or a site assessment.

Write down the intended rental period, operating schedule, location of the unit, and whether it will share electrical service with other equipment. An event site, warehouse yard, farm, and construction property can have very different distribution systems, load patterns, and access limitations. If the connection depends on temporary distribution, an existing building service, or an extension from another area, describe that exact arrangement to a qualified electrician before committing.

Read the nameplate with a qualified professional

The nameplate and manufacturer documents may identify nominal voltage, phase, frequency, full-load current, compressor information, minimum circuit or protection requirements, connection type, and environmental limitations. The precise terminology varies. Ask the supplier to explain any abbreviation that is not clear and to supply the actual requirements for the equipment being offered. Avoid using a similar reefer's specifications or a search result for another manufacturer's model.

Have a qualified electrical professional compare those values with the available service, distribution equipment, disconnects, overcurrent protection, conductor selection, grounding and bonding arrangements, and the route to the unit. The assessment should include startup demands, not only an assumption that the load is steady. It should also account for other connected equipment operating at the same time. A power source that is adequate when idle may be inadequate during a busy event or when other large loads cycle on.

Share the written equipment requirements with the electrician and ask for an explicit feasibility answer: what source is available, what work is required, which parts the site must provide, and who is responsible for installation and inspection. The OSHA electrical requirements in 29 CFR 1910.303 address general requirements for electrical equipment in covered workplaces; they are a regulatory reference, not a design for your site. Local codes and circumstances also matter. The OSHA requirements for wiring methods and components, 29 CFR 1910.305 are another reference for workplace contexts; ask the professional responsible for your installation which requirements apply.

Inspect the whole path from service to unit

Planning should follow the electricity from its source to the reefer inlet. Identify the supply point, distribution equipment, disconnect, cable or conduit route, connector, and unit connection. Confirm that each component is compatible with the unit and the environment. Outdoor use, rain, snow, vehicle traffic, pedestrian movement, temperature, and possible mechanical damage all affect the suitability of a route and protection. The electrician should determine the correct equipment and methods; do not improvise a plug, splice, reducer, adapter, or cable route.

Walk the proposed route at the site. Will a cable cross an aisle, roadway, loading dock, gate, accessible path, or event circulation route? Can a vehicle roll over it, or can snow removal or mowing damage it? Is the connection reachable for inspection without requiring staff to climb over stored goods? If the route cannot avoid a conflict, describe it to the electrician and site manager so that a compliant and protected arrangement can be designed. Do not conceal a trip, crush, or water exposure concern with a temporary covering chosen without professional review.

Confirm who controls the disconnect and what happens if it trips. Staff should know whom to contact, but should not open electrical equipment or reset a device they are not authorized and trained to handle. A written label or site map can help responders find the circuit and isolate it under the approved procedure. Agree how a technician will reach the connection during operating hours and outside them.

Ask about startup and shared loads

A reefer can have a different electrical demand at compressor start than during ordinary operation. Ask the equipment provider for starting characteristics if needed, and give that information to the electrician. If a generator is proposed, the professional must determine whether it can supply the unit under startup, operating, and environmental conditions. Comparing only a generator's advertised maximum output with one current value is not an adequate compatibility check.

List other loads on the same service: cooking equipment, lighting, sound systems, pumps, heaters, chargers, or other refrigeration. Include which loads may operate at the same time and which are critical. A plan that works in a quiet test can fail when the full operation begins. If the supply is shared, ask whether it is dedicated, what capacity remains, how protection is coordinated, and who can respond to an overload or fault. Keep a record of final approved connections so that a later event contractor does not unknowingly add a load.

Discuss voltage variation, long-distance voltage drop, and connection length with the electrician rather than deciding cable size from a generic chart. Longer routes may change the design. If the planned unit location shifts after a site walk, revisit the assessment; moving a container farther from the source can invalidate previous assumptions.

Consider service continuity and monitoring

Ask what indications are available when incoming power is lost and how staff will notice. A controller may display a fault or temperature, but it does not necessarily send a remote alert. Find out whether the actual unit has any alarm output or communication option, who can see it, what it reports, and whether the function will be active in your rental. Do not assume connectivity, notifications, or remote monitoring unless the supplier confirms it in writing.

The operating team should establish its own checks, escalation contacts, and actions for a power failure. Set responsibility for checking supply, controller status, independent temperature records where appropriate, and alarm receipt. Make sure those duties are covered overnight, at shift change, during breaks, and when the site is closed. The reefer monitoring-plan guide helps convert general intentions into assigned tasks and a written record.

If the contents require controlled temperatures, ask the product owner or quality manager how much response time is acceptable and what to do with product exposed to an excursion. Do not assume a reefer will hold safe temperatures for a fixed number of hours after power loss. The answer depends on conditions and product-specific procedures. Identify an alternate storage site, transfer method, decision-maker, and documentation method before loading. For a fuller contingency discussion, see the backup-power planning guide.

Scope generator and alternate-source questions

When utility power is unavailable or not dependable, ask whether an alternate-power arrangement is possible for the specific booking. Confirm exactly what equipment is supplied and who is responsible for delivery, connection, operation, fuel, refilling, maintenance, inspections, and emergency calls. Ask whether a qualified person will verify capacity and compatibility with the reefer, including startup load. Clarify the intended run time and the assumptions behind it. A generator's estimated runtime depends on its actual load, fuel, maintenance, weather, and setup; a brochure figure is not a guarantee for a specific installation.

Generator location, exhaust, ventilation, weather protection, fuel storage, security, and connection methods require appropriate professional review. Keep combustion equipment outside enclosed spaces and away from openings in accordance with its instructions and applicable safety requirements; do not place it where exhaust can enter a building, vehicle, or occupied area. The operator should identify how refueling will occur without interrupting supply and how an alarm will reach the person who can act. The OSHA portable-generator safety guidance discusses electrical and carbon-monoxide hazards in disaster-response work; use it as hazard awareness, not as a complete site-specific generator design.

The CDC's carbon monoxide information explains why generator exhaust presents a serious exposure hazard. Consult the generator manufacturer and qualified professionals for the placement and operating procedure for your site.

Consider whether an alternate source is actually independent. Two supplies routed through the same vulnerable distribution panel or exposed cable may fail together. Ask the electrician to identify failure points and whether a backup source can be safely switched or connected. Never backfeed a building circuit or connect generators with improvised equipment. If the contingency depends on manual transfer, define who is authorized, what training is needed, and whether their response time fits the product plan.

Confirm the rental and site boundaries

Before accepting a quote, ask the supplier to list what it provides and what it does not: reefer, power cord or other accessories, power source, generator, delivery and placement, commissioning, service contact, and pickup. Avoid assuming that a delivery or rental quote includes electrical installation. Ask whether the unit will be tested before dispatch and what inspection takes place when it is placed, while recognizing that the site connection still needs its own approval.

Give Mobile-Stor the delivery address, proposed location, electrical source details, connection distance, operating dates, other significant loads, and any generator requirement. The refrigerated container information provides the product context, while service-area information helps identify regional coverage; neither replaces confirmation for an exact site. A site-delivery preparation guide is useful for documenting the route and placement area.

Put the final responsibilities into the quote or operating handoff. Name who installs the supply, who makes the connection, who authorizes energizing the equipment, who monitors power, and who calls for service. If any answer is “the other party,” get both parties to agree before delivery. To review actual unit availability and scope with Mobile-Stor, send the team your site and power questions.

Make the go/no-go decision before loading

Do not schedule product arrival until the power source has been assessed, the connection plan is approved by the responsible professional, and the reefer can be operated and observed. Test the complete arrangement using the approved startup procedure, verify alarms and communication paths if provided, and confirm that other planned loads do not compromise service. Document the unit identification, approved connection, responsible contacts, and unresolved limitations.

If the service cannot be confirmed, pause and resolve the gap rather than relying on a last-minute adapter or generator. If an alternative source is chosen, repeat the evaluation for that configuration. A reefer plan is sound when the unit requirements, electrical design, site route, operating responsibilities, and product contingency all match. The final check is specific to the model and site—not an assumption based on the word “reefer.”