Frequently Asked Questions

• A battery energy storage system is a smart, grid-independent energy solution for your home.
• Thanks to its integrated control system with adaptive logic, the storage system manages and optimises the flow of electricity, maximises the energy self-sufficiency of the household and at the same time stores the energy produced by solar panels so that it can be used at the moment it is actually needed.
• Surplus electricity can be fed straight back into the public grid. If you are not an energy trader, the energy is instead kept in the batteries for your own household’s use.
• Conversely, a shortfall of electricity in the storage system can be topped up from the public grid — preferably from the low “night” tariff.
• The system can be used in both grid-tied and off-grid (island) configurations.

Electricity generated from alternative sources — photovoltaics, wind turbines and the like — is stored in the batteries of the storage system. The accumulated energy is then released under active control according to the current demand at the point of consumption, with the aim of maximising energy efficiency and minimising the running costs of the building (a family house, an apartment unit and so on).

The financial saving arrives at the moment when the energy generated and stored in this way (from the sun, the wind or a generator set) covers the building’s consumption without drawing any energy from the distribution grid.

The stored electricity is available at any time and without interruption, and it can be supplied to the local network independently of what is being generated at that moment.

A battery energy storage system is designed for the efficient storage and targeted use of energy:

• during periods of energy overproduction, so the surplus is available when a source fails
• where the quality of the electricity supply needs to be improved
• during periods of energy overproduction, so the surplus is available at times of increased consumption
• reducing the rating of the main circuit breaker
• storing energy in the form of hot water (water heating)

The payback period depends on the target application and the final price of the system. As a general rule, however, payback for family houses most often falls somewhere between 5 and 12 years.

The price of the system depends on the parameters of the target application. Thanks to its modular design, the system can be specified and adapted to each customer’s specific requirements. The basic HES configuration starts at CZK 250,000 excl. VAT (the standard New Green Savings (Nová zelená úsporám) subsidy is included in this price).

Yes. Under the New Green Savings (Nová zelená úsporám) programme — sub-area C.3, Installation of solar thermal and photovoltaic systems — the system qualifies for a subsidy of up to CZK 150,000.

AERS is a technology company. The subsidy application can be processed on the customer’s behalf by a specialised installation company.

Installing the storage system requires a cable route to be prepared between the installation site of the HES unit (a utility room or garage) and the building’s main distribution board. If the building also has a photovoltaic installation, a separate cable route must additionally be run between the generating source and the HES unit.

The HES unit is compatible with existing photovoltaic systems. The technology uses the existing inverter and, by way of the storage system, keeps it running efficiently even when there is no direct solar yield — in effect simulating the generating conditions of daylight.

We only set requirements for the parameters of a solar installation where we identify the potential to increase its efficiency or to optimise the system as a whole. Achieving the highest possible customer satisfaction with the final solution is what matters most to us.

The system is modular, so both power and capacity can be scaled up to suit the final application. A larger house can be expected to have higher consumption and greater energy demands, but it will also have a larger roof area for a solar installation (more photovoltaic capacity produces more energy), and therefore more energy will be available to store in the batteries. Our unit has standard dimensions of 600×600×1920 mm, and its capacity or power output can easily be increased by adding another unit alongside it.

Our equipment can be used in commercial buildings without any difficulty. In these cases customers most appreciate the backup power function and the ability to optimise quarter-hourly demand peaks. Companies can draw subsidies too, through the so-called low-carbon subsidy programmes, and our company provides customers with full assistance in doing so.

The unit is comparable in size to a refrigerator. Its dimensions are 600×600×1920 mm.

The storage system is primarily designed to be installed in the building’s utility room; in some buildings that role is filled by a garage or a cellar, and the unit can be installed there without any problem. The ideal environment is a space with a temperature between 5 and 45 °C, with around 18 °C being the most favourable temperature for the batteries. The essential requirement is a dry environment with the possibility of air circulation — through a window, mechanical ventilation or an air duct, for example.

We do not recommend installing our equipment in rooms where the occupants spend most of their time. The reason is its noise level, which is around 50 dB and can reach up to 60 dB when the cooling system switches on. It is comparable to being in a room with a heat pump or a boiler.

By its ingress protection rating, the storage system is intended exclusively for indoor installation. We are planning outdoor versions of our products only for higher-power, higher-capacity solutions, in the form of containerised systems.

The choice of a particular unit, and its price, always depend on the required parameters of the given application. For a family house we can specify a smaller-capacity station intended primarily to cover demand peaks, just as we can specify a higher-power, higher-capacity solution aimed at maximising energy self-sufficiency. The final solution is always tailored to the individual needs of the customer — their requirements, the daily routine in the building and the number of occupants. Every design is drawn up so that it pays off both in terms of functionality and in terms of financial return.

If it is connected to a solar installation that produces most of the electricity for the building where it is installed, then our equipment can genuinely be called very environmentally friendly, as it helps reduce the consumption of CO2-producing fossil fuels.

If, on the other hand, the station is charged from the distribution grid, that energy comes from a particular mix of generation (nuclear power stations, coal-fired power stations, renewable sources), and how green it is can be argued either way. In general, though, it is fair to say that with a battery energy storage system you behave far more sustainably, and the energy in it is energy obtained predominantly from renewable sources.

The electronics in the storage system have a service life of at least 25 years. Battery life depends on the number of cycles; university testing indicates a service life of between 20 and 35 years, with battery capacity declining slowly over that time.

Once installed and commissioned by a qualified technician, the storage system is set to automatic mode. Installation is carried out exclusively by a certified partner who has completed the required training. The unit itself therefore needs no active operation and runs entirely autonomously.

Through a web browser you can easily follow what the system is delivering — the savings achieved, your degree of energy independence, the current battery state of charge — or select which circuits should stay live during a longer outage (the fridge or the lighting, for instance). The unit can be safely disconnected at any time using the Total Stop button.

• The option of reducing the main circuit breaker rating, and of storing energy as hot water or heating
• Backup power (UPS) function
• Exploiting the difference in electricity prices over the course of the day (low/high tariff)
• Maximising the building’s energy self-sufficiency
• Covering short-term demand peaks in the household
• Working with the ripple-control (HDO) signal for low and high tariff
• Balancing asymmetric loads across phases
• Minimising your own energy costs
• The station is ready for electric mobility
• A purely Czech technological solution

The installation company always walks the customer through the emergency shutdown procedure for the station and goes over every situation that may arise during operation. The customer is also briefed on the maintenance they are permitted to carry out — how to keep dust down in the room housing the unit, for example. A detailed user manual is included as a matter of course. Warranty and post-warranty servicing may only be carried out by a certified person.

We have complete confidence in our equipment, and the proof of that is a 5-year warranty from the date of commissioning.

We are currently building a network of reference installations where our equipment will run in pilot operation after its market launch. It can also be seen at trade fairs and exhibitions devoted to energy saving, housing and new technologies.

The unit itself produces no waste during operation. At the end of its service life, however, it must be disposed of in an environmentally sound manner.

Units intended for family houses are inspected once a year. For larger energy installations, inspections take place quarterly or half-yearly, depending on the specific application.