Gas Springs for EV Charging Cabinet Access Doors

Why EV Charging Cabinet Access Doors Need Gas Springs

EV charging cabinet access doors need gas springs because many service doors are too large, too awkward or too frequently opened to rely only on hinges and manual lifting. A gas spring reduces handling effort, controls movement and helps keep the door in a usable open position during inspection or maintenance.

In a DC fast charger or larger EVSE cabinet, the access door may protect power electronics, contactors, cable management areas, cooling components, filters, communication hardware or service disconnect zones. A technician may need both hands free. One hand holding the door and one hand working inside the cabinet is poor service design.

Gas springs are especially useful for top-hinged covers and upward-opening doors because gravity is always trying to close the panel. They can also be used on side-opening service doors where controlled opening, partial support or hold-open assistance is needed. The key is not simply adding a gas spring; the spring must match the door geometry and the real outdoor environment.

Where Gas Springs Are Used on EV Charger Cabinets

Gas springs for EV charging cabinet access doors are commonly used on upward-opening service covers, rear maintenance panels, side access doors, filter doors and larger cable-compartment covers. The best location depends on how the cabinet opens and what the technician needs to reach.

Top-hinged covers usually need the most careful force calculation because the gas spring must overcome a closing moment around the hinge. Side-opening doors may need less lift force, but they still need controlled movement and a defined open position. Wide doors may require two gas springs to avoid twisting the panel or overloading one hinge side.

Some EV charger cabinets use separate access zones: customer-facing compartments, service compartments and high-voltage power-electronics compartments. The gas spring choice should follow the function of the door. A lightweight user-facing flap may not need gas spring support. A larger service-access panel that exposes internal components usually deserves a more deliberate motion-control review.

Single vs Paired Gas Springs on EV Cabinet Doors

Single gas springs are suitable for narrow or lighter EV cabinet doors when the panel is stiff enough and the hinge line can tolerate one-sided support. Paired gas springs are usually better for wide, heavy or high-value service doors because they spread the load and reduce twisting.

Paired springs should be force-matched. If two springs from different batches or very different tolerances are fitted to the same wide door, the stronger side may lift faster and the weaker side may lag. Over time that can show up as hinge wear, bracket distortion or a door that feels slightly crooked during movement.

Newtone controls gas spring force tolerance at ±5%, which helps paired applications behave consistently. For OEM production, using matched springs from the same platform is cleaner than mixing parts that only appear similar by nominal force.

Outdoor Material and Seal Selection

Outdoor EV charging cabinets need gas springs that can tolerate temperature changes, UV exposure, ozone, moisture and contamination. For most general outdoor cabinet applications, black nitrided rods with HNBR seals are a strong standard choice. Stainless steel should be reviewed when corrosion risk is high.

Newtone gas springs use HNBR sealing as standard, selected for UV and ozone resistance. The black nitrided rod has a typical surface hardness of 900–1000 HV and a treatment depth of 20–30 µm. This rod surface helps protect the sealing interface over repeated cycles.

Stainless steel gas springs should be considered for coastal installations, high-humidity sites, washdown areas, road-salt exposure or locations where corrosion could damage the rod. If the rod pits, the seal suffers. Once the seal suffers, force loss and oil leakage risk increase.

Temperature should also be checked. Gas spring force changes by about 0.3% per °C. A spring specified at 20°C (68°F) will feel different in a hot roadside cabinet or in freezing winter service. The correct answer is not always more force; it is force selected for the real operating range.

Mounting Guidance for EV Charging Cabinet Access Doors

Mounting geometry decides whether the gas spring works smoothly or fights the door. The lower and upper pivots should stay in the same plane of movement so the rod is loaded axially, not sideways. Gas springs are not structural guide rails. Side-load shortens life.

Where the geometry allows it, mount the gas spring with the rod pointing down in the at-rest or closed position. This keeps oil near the seal area and supports smoother damping. It is a default best practice, especially where quiet and consistent movement matters.

The end fittings should match the movement. Ball sockets are useful where the angle changes during opening. Eyelets can work well when the pivots are aligned and the movement is simple. Brackets must be strong enough for the load and positioned so the spring does not bottom out before the door reaches its intended open stop.

Service clearance matters too. The gas spring should not block filters, fans, fuse access, cable entries, diagnostic ports or technician hand paths. A door that opens well but blocks the part being serviced is not a good design.

When to Consider Locking Gas Springs or Safety Tubes

Locking gas springs or locking safety tubes should be reviewed when a technician may work under a raised access door or when unexpected closing could cause injury or equipment damage. A standard gas spring provides lift support, but it is not the same as a mechanical safety lock.

For a heavy top-hinged cabinet cover, a locking safety tube can provide backup at full extension. For an access panel that needs adjustable intermediate positions, a locking gas spring may be the better option. The choice depends on how the door is used, not only on weight.

For EV charging cabinets, this decision often appears in service doors that expose power modules, cooling assemblies or internal electrical compartments. If the open door creates a pinch or crush risk, the design should not rely only on gas pressure.

Common Specification Mistakes

The most common mistake is selecting gas springs for EV charging cabinet access doors by weight alone. Weight matters, but hinge geometry usually decides the real force. A 15 kg (33 lb) door can need very different springs depending on centre of gravity, open angle and mounting position.

A second mistake is overspecifying force. More force may sound safer, but too much force can make the door hard to close, increase bracket load and create stress when the cabinet is closed for long periods. It can also make paired-door behavior less predictable if the geometry is poor.

We see this during first-article review. An equipment OEM may send a new cabinet access-door drawing and ask for a spring based mainly on door mass. Once the hinge-to-centre-of-gravity distance and spring moment arm are checked, the first force guess can be far off. Correcting the force and bracket position before tooling is far cheaper than fixing a door that slams, binds or refuses to stay open in the field.

Other mistakes include ignoring wind load, using low-grade seals in outdoor cabinets, mixing unmatched paired springs, leaving no service clearance and placing the spring so it side-loads the rod through the stroke.

Frequently Asked Questions About Gas Springs for EV Charging Cabinet Access Doors

What type of gas spring is best for EV charging cabinet access doors?

For most EV charging cabinet access doors, a standard compression gas spring with the correct force, stroke, end fittings and mounting geometry is the best starting point. Locking gas springs or safety tubes should be reviewed when the door must stay safely open during maintenance.

How do you calculate gas spring force for an EV cabinet access door?

Calculate the force from the door weight, hinge-to-centre-of-gravity distance, opening angle, number of springs and effective gas spring moment arm. Door weight alone is not enough because mounting geometry changes the required force significantly.

Should EV charging cabinet doors use one gas spring or two?

Narrow and lighter access doors may use one gas spring, but wide or heavy EV cabinet doors usually work better with two matched gas springs. Paired springs reduce twisting and help the door move evenly across the hinge line.

Do outdoor EV charger cabinets need stainless steel gas springs?

Not always. Black nitrided rods with HNBR seals are suitable for many general outdoor cabinet applications. Stainless steel should be reviewed for coastal, high-humidity, washdown or road-salt environments where corrosion risk is higher.

When should locking gas springs or safety tubes be used on EV cabinet doors?

Locking gas springs or safety tubes should be considered when a technician may work under a raised door or when unexpected closing could cause injury or equipment damage. A standard gas spring assists motion, but it is not a mechanical safety lock.