PV · battery storage

Quiet PV inverters and battery storage – and protect them from heat

Inverters whine at high frequencies, battery storage cooling runs day and night. Our enclosures damp exactly these tones and protect the units from sun, rain and hail at the same time.

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Schematic: wall-mounted acoustic enclosure in front of an inverter with air inlet at the bottom and outlet at the top

16–18 kHztypical peaks – damped specifically

1 to 5 unitswall-mounted or free-standing

from approx. €4,400net, fixed catalogue price

A1non-combustible – key at battery storage

The problem

A whine you cannot ignore

PV inverters are quieter than a heat pump – but they sound different. The power electronics switch in the kilohertz range, and the fans add to it. The high, tonal whine is especially noticeable when the inverter hangs on the house wall next to a terrace or bedroom.

Battery energy storage systems (BESS) run around the clock. Here it is mainly the air-conditioning and ventilation units of the containers that set the tone at night, plus converters and transformers with their typical hum.

High frequencies: Typical inverter noise peaks lie at 16–18 kHz – clearly audible and annoying for many people.
Tonality: A clearly audible tone attracts a penalty of 3 or 6 dB under the German TA Lärm.
Heat: In direct sun, inverters reduce their output (derating) – a yield loss that adds up over the years.
Weather: Rain, hail and dust wear on outdoor units and connections.
Fire safety: No combustible insulation may be used at battery storage.

PV inverters

Two designs – for 1 to 5 inverters

For every inverter range in the catalogue there is a wall-mounted enclosure and a free-standing housing with a built-in mounting shelter.

Wall-mounted

Front enclosure

The enclosure is built in front of the wall-mounted inverter. Clearances to the outer edge: 500 mm left and right, 800 mm above (Premium 900 mm).

Free-standing

Housing with mounting shelter

For systems without a suitable wall, e.g. on open ground or roofs. The inverters hang on the shelter inside the housing, 600 mm apart.

Cooling

Cool air in front, exhaust on top

Cool air is drawn in at the front bottom, flows past the inverter and leaves through HSA3 tubes in the roof (see section above). The front opens fully for service.

approx. −15 dB(A)Standard

approx. −20 dB(A)Premium

10 manufacturersenclosures by range in the catalogue

Shadeprotection from sun, rain, hail and dust

In the catalogue: Huawei, SMA, Fronius, Sungrow, SolarEdge, Kostal, GoodWe, Growatt, FoxESS and Victron – with enclosure dimensions, weight and fixed prices for 1 to 5 units, from approx. €4,400 net. For other inverters, enter the dimensions; the enclosure is designed live.

The enclosure for your inverter

Choose manufacturer and range, set quantity and design – dimensions, fixed price, specification text and BIM model instantly.

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Battery storage

Noise control for BESS – non-combustible, no heat build-up

Battery storage is increasingly installed in commercial areas bordering residential housing, at grid nodes and next to PV parks. Its cooling runs day and night – and has to, because the cells need a constant temperature.

That is why we always design the noise control together with the air flow of the cooling units: no measure may route warm exhaust air back to the intake or push the pressure drop beyond the fans' reserve.

Enclosures for single containers or whole rows, open at the top via tube silencers
Silencers directly in front of ventilation openings and AC units
Noise barriers towards residential buildings when only one side is critical
HSA3 in A1 – non-combustible, no fibres, weatherproof

What we need for the design

Manufacturer and type of the storage system or containers
Position and air volume of the AC and ventilation units
Sound power (data sheet or measurement), operating hours
Site plan with distance to the nearest residential building

There is no fixed-price catalogue for BESS: we design per project. The free configurator gives a first guide price.

Free configurator Request a BESS project

Frequently asked questions

Doesn't the inverter get too hot inside the enclosure?

No – the enclosure is designed around cooling. Cool air enters at the front bottom and flows past the unit, the warm air leaves through the tubes in the roof. The enclosure also shades the inverter; without direct sun it runs cooler.

Does the enclosure help against output loss in summer?

It can. Many inverters reduce their output when they get too hot. If yours currently hangs in full sun, it benefits from the shade of the enclosure. The effect depends on the unit and the site.

Can I reach the display and connections?

Yes. The front opens fully. Cables are routed from below or the side as usual.

How many inverters fit in one enclosure?

One to five units side by side, in both designs. Larger systems are split across several enclosures or engineered per project.

Why is A1 so important at battery storage?

Because no insulation may burn along in a fire. HSA3 is non-combustible to class A1 (EN 13501-1) and contains neither mineral wool nor foam.