FAQ

SAVEBOX HOME

How do I adjust the unit to my needs?

SaveBox HOME allows you to choose the ratio of backup energy and energy production. You can choose the amount of stored energy you want to use in case of blackout. Obviously this reserved energy you will not be able to use for energy production from the photovoltaics.

What if batteries are fully charged and the sun is still shining?

In case the sun is shinning, your batteries are fully charged and there is not enough consumption in the house, SaveBox HOME allows you to remotely switch on one significant device – usually it is the boiler. The accumulation can continue in heating the water.

Is there any monitoring available?

If SaveBox HOME is connected via LAN to the internet, you will have access to complete history of energy production and storage in your unit. The price of this unit includes cloud service with secure access.

What is the NFC communication?

Using your smartphone with NFC communicator you can upload live data by placing the phone on the right spot of SaveBox HOME.

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Does SaveBox HOME communicate with smarthomes?

SaveBox HOME communicates with Foxtrot – the system for smarthouses produced by czech company Teco.

SAVEBOX – IN GENERAL

What is considered one cycle of accumulator charging/discharging?

One cycle of our accumulator charging/discharging means – simply speaking – a “flow” of energy corresponding to the accumulator capacity through the accumulator. This means for example one full charging and one full discharging, or two cases of charging half of the accumulator capacity and two half discharging cases. Therefore even if the system switched ten times a day from the charging mode to the discharging mode due to the changed illumination of the photovoltaic field the whole of that may correspond to less than one full accumulator cycle.

How does cooperation of energy sources work in powering a family house?

The SaveBox unit can be adapted to different situations, depending on its configuration. The following is an example of a setting applicable to a system for powering a residential house with connection to the electric grid and photovoltaic panels:

If immediate output of the photovoltaic panels is higher than the power input of the appliances then the consumption is covered from the photovoltaic panels and unused energy is stored in accumulators.

If immediate output of the photovoltaic panels is lower than the required power input and the energy stored in the accumulators is higher than the required energy reserve the missing input is provided to the appliances from the accumulators.

If the energy stored in the accumulators is lower than the required energy reserve then the appliances are powered from the grid and the photovoltaic energy is used for charging the accumulators.

In the case of a grid power cut the appliances are powered from the accumulators (with potential energy replenishment from the photovoltaic panels).

The energy reserve may be set differently depending on the energy needed for backup in case of grid power cut. It may be preset to the minimum value when the whole available capacity of the accumulators is used for cycling – therefore with the “discharged accumulator” priority setting. In this case the time for which the system is ready to receive photovoltaic energy is maximised.

What are the safety mechanisms of the system?

Redundancy – for maximum safety, we combine electric and electromechanical safety elements in every accumulator block, which always ensure that all safety mechanisms function reliably.

Disconnection – another property of our large accumulator systems that ensures their safety. With only one command, it is possible to isolate our large accumulator units into smaller capacity units. These are much less dangerous in critical situations compared to the original single large unit. When placing large accumulator blocks on a motor vehicle, this is an essential property. With our LA3016 accumulators, this feature has become standard in all accumulator systems.

What is accumulator support by source?

Accumulator support by source is an inbuilt function allowing for appliance powering by high output due to parallel run of an external source and an exchanger in the SaveBox unit.

Example: There is a hybrid system with a SaveBox M (8.5 kW) unit and a central power source with the output of 5kW with a SaveBox unit controlled by automatic start. First the load of 5 kW is connected and powered solely from the accumulator. Then the load increases for example to 10 kW. Thanks to the output reserve of the exchanger in the unit no power cut results (the exchanger in the unit manages 12 kW for the period of at least 1 min). The SaveBox unit detects high input current and starts the central electric power source. After the central power source run in the unit divides the input between the central power source (5 kW) and the exchanger (5 kW), thus easily keeping the appliances powered. Following decrease of the load the central power source is switched off again and the appliances are only powered from the accumulator. The whole process in addition is free of interference effects at the unit output for the source switching is absolutely smooth and continuous.

What is source support by accumulator?

Like in the previous case (accumulator support by source) the process is based on parallel run of the external energy source and the exchanger inside the SaveBox unit. Just the start mechanism is different – if the unit works in the mode with the appliance powering from the external source (for example the central power source) and the maximum output of the external sources is exceeded then the exchanger in the SaveBox unit supplies the missing output to the load.

Example: A SaveBox-M unit is connected to a 5 kW central electric power source. Current load at the output from the SaveBox is for example 2 kW, and then the energy is supplied to the appliances directly from the central power source. Accumulators in the unit are powered by the residual output (5 kW – 2 kW = 3 kW). At the moment of increase of the load output for example to 10 kW the SaveBox unit switches form the accumulator charging mode to the power supply mode and the missing output (5 kW) is added to the output supplied from the central power source. After decrease of the load the exchanger returns to the accumulator charging mode. Then the central power source is burdened optimally throughout the operation time and runs with maximum efficiency without being overloaded.

Can the supplied output be increased by connecting more SaveBox units?

Yes, SaveBox-L and SaveBox-M units can be connected in cascade in the case of high output requirement to crease the needed high output source. For example connection of two L units can provide a 3-phase source with permanent output current 63 A (i.e. output 42 kVA). In the case of full load each unit provides half of the output. Of course energy stored in both accumulators will be available for consumption. If even this energy is not enough then a third unit may be added, increasing the energy available to the appliances by another 60 kVAh. The additional unit may be connected without operation interruption, completely without effect on the powered appliances – it is therefore possible to add other charged units to the running units in the case of insufficient energy in the latter. Parallel-cascade combinations of large numbers of SaveBox units can create sources with very high output and capacity, for important uninterruptible sources even with redundancy assuring high reliability of power supply. A good example may be a system assembled for powering a stage of an open-air event where a combination of 6 SaveBox-L units creates a system with the output of 2 x 3 x 63 A, accumulator capacity 360 kVAh and extremely high reliability provided by redundant connection of the power supply units.