Reefer Container Power Failure: What to Do and How to Prevent It

A reefer container power failure happens when a refrigerated container loses its electricity during the trip. The cooling unit then stops, and the cargo starts to warm. This guide explains what happens, why it happens, and the six steps to take. It also shows how to prevent a reefer container power failure on your next shipment.

What Happens During a Reefer Container Power Failure?

A reefer container has its own cooling unit, but the unit needs power all the time. When the power stops, the cooling stops. The insulation only slows the heat coming in. It cannot stop it. So the cargo temperature rises step by step.

The damage depends on the cargo:

• Frozen seafood, meat and food: A rise in temperature can thaw the cargo in part. This changes the texture and the quality.
• Fresh fruit and vegetables: Unstable temperature speeds up breathing and ripening. It can also cause damage from wrong storage conditions.
• Medicine and sensitive goods: The product may lose stability. Always follow the storage rules of the maker.

Even a short outage matters. Chilled cargo warms fast once the unit stops. Also, the display shows the air temperature, not the temperature inside each carton. So the air can return to normal after the power comes back while the core of the cargo is still warm.

What a power failure can cost

Besides spoiled cargo, a power failure can bring extra costs:

• Checking and repairing the cooling system.
• Replacement power or a genset.
• Storage fees for the container at the port or depot.
• Quality testing and sampling.
• Replacement transport, repacking or disposal.
• Claims and disputes with your partner.

It can also delay the delivery. Then the buyer plan and the cost at the destination port may change.

Common Causes of Reefer Container Power Failure

To fix the problem, find the cause first. Restoring the power is not enough if the same fault can come back.

• Power cut at the port or yard: Reefer containers plug into power at ports, terminals and depots. A grid cut, a fault in the supply system or a gap when the plug is moved can stop the unit.
• Power loss on a ship: On a vessel, a blackout or a tripped circuit breaker can stop the refrigeration. A blackout can hit many reefer containers at once.
• Genset failure on the truck: On the road, a reefer container often runs on a reefer container genset, which is a generator set. It can run out of fuel, break down or lack maintenance.
• A fault in the cooling unit: A fault in the controller, the sensors or the compressor can stop the cooling while the outside power is fine. So check if it is a power loss or a unit fault.
• A wrong connection: A damaged cable, a loose plug or a wrong plug-in step can cut the power.
• Weak monitoring and handover: Nobody watches the alarms, or the news does not reach dispatch. Then the outage lasts longer. Alarms may also fail to restart after the power returns, so the problem goes unseen.

What to Do After a Reefer Container Power Failure

First, restore safe storage conditions. Then record all the data, so you can judge the cargo and the responsibility. Follow these six steps.

Step 1: Confirm the problem

Check if the container lost power or if the unit failed. Read the controller and note the alarm code, the set temperature, the real temperature, the time you found the problem and the container location. If you have remote monitoring, check the temperature history and the alarm log. For help with codes, see our guide to reefer container alarm codes.

Step 2: Call the operator at once

Tell the driver, the trucking company, the shipping line, the terminal or the technical team, depending on where the container is. Give the container number, the location, the cargo type, the set temperature, the alarm and the time. An early call helps the parties find the cause and arrange backup power or a technician.

Step 3: Restore power and cooling

If the outside power is the cause, work with the operator to restore it or switch to backup power. If the cause is the genset, the controller or the cooling unit, ask a qualified technician. Do not rewire the unit yourself. Do not change the set temperature to cool faster, because it may not suit the cargo. After the power returns, watch that the temperature goes back to the target and that no alarm remains.

Step 4: Check the cargo

Power back does not mean the cargo is fine. Collect the temperature data for the whole period and compare it with the limits of the cargo. For food, use a food safety check. For medicine, follow the guide of the maker and ask the quality team. If the cargo may be affected, keep it apart. Do not sell or use it before a clear decision.

Step 5: Record the evidence

Good records protect you in a claim. Claims often rely on the datalogger evidence. Collect:

• Photos or video of the container and the unit.
• The temperature history, the alarms and the datalogger data.
• The start time, the end time and the time the power returned.
• Signed statements from the trucker, the port, the shipping line or the technician.
• Quality test results and damage records.
• The contract, the delivery papers and the liability terms.

Keep the original data and do not edit it. If the cargo is insured, tell the insurer within the time stated in the policy.

Step 6: Decide responsibility and the fix

Use the evidence, the contract, the insurance cover and the law. Do not assume that one party is at fault only because the failure showed up during transport. Then choose the next move. You can continue the trip, move the cargo to another container, move it to a cold store, run more tests, or handle the cargo that fails.

Note: Do not open the container door without a plan. Opening it changes the temperature inside and can hurt the cargo.

How to Prevent Reefer Container Power Failure

Most failures start with a small gap in power, settings or monitoring. These habits reduce the risk:

• Use remote reefer container monitoring. Alarms and temperature data reach you early, so you can act before the cargo is lost.
• Use a genset on long road trips. A reefer container genset keeps the unit powered between the factory and the port. Check the fuel and the service before the trip.
• Keep the time without power short. Plan the gate in, the yard stay and the transfers, so the container is plugged in as soon as possible.
• Check cables and plugs at every handover. Record the power status and the temperature each time.
• Share the set temperature and the cargo needs. Every party in the booking should have the same data.
• Pre-cool the cargo before loading. A reefer container keeps the temperature. It does not cool warm cargo.

FAQ: Reefer Container Power Failure

How long can a reefer container stay safe without power?

There is no single answer. It depends on the box size, the insulation, the cargo mass, the start temperature, the limit of the cargo and the outside temperature. A heat transfer calculation or a tool from the maker can give an estimate.

Is the cargo safe after the power comes back?

Not always. The air temperature can return to normal while the core of the cargo is still warm. Check the data for the full period and the limits of the product.

Who is responsible for cargo damaged by a power failure?

It depends on the cause and the contract. A carrier is often liable when the damage comes from poor monitoring or from failure to keep the power supply. A shipper may share the liability if the cargo was loaded at the wrong temperature or the papers were wrong. Claims often rely on the datalogger evidence.

Reefer Container Shipping from Vietnam to the USA with iSolution Logistics

Are you looking for safe, professional reefer container shipping to the United States? iSolution Logistics supports your shipping from Vietnam to USA, from the factory to the port. We also connect with the international ocean freight route.

Our reefer container shipping services

• FMC certification #033501: It meets the licensing requirement for ocean transport to the United States. It also supports compliance with the applicable shipping rules.
• Professional reefer trucking: We coordinate vehicles from the factory to the port. We focus on the storage temperature, the handover schedule and the cargo risk.
• Documents and customs support: We help with the Health Certificate, the C/O Form B, export customs procedures and other documents for each shipment.
• End to end tracking: We update the status from container pick up and loading at the factory to inland transport. We continue until the container is handed over at the port and loaded on the ship to the USA.
• 24/7 customer support: Our team works with drivers, carriers and technicians to solve problems fast. This helps protect the schedule and the cargo quality.

Learn more about our reefer shipping service, and tell us the temperature you need. Then we will plan the shipment with you.

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References:

• IDENTEC Solutions: When a Reefer Unit Warms Up, Understanding Failures and Preventing Losses
• The Swedish Club: Refrigerated Cargoes

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