FAQ – Frequently asked questions

FAQ

Can I expand the power battery retrospectively?

Yes, of course. Our flexible battery system is available with  gross capacities of 5.7, 7.6, 9.6 and 11.5 kWh. The system is designed for plug and play operation. At any time within the first 18 month of operation you  can expand capacity in steps of 1.9 kWh up to maximum capacity of 11.5 kWh.
You can utilise 90%  of your system's gross capacity at any time.

Last update on 11.05.2017 by Frank Gaspari.

I want to purchase an electric car in the near future. Will I be able to expand my storage system?

Yes, with our Power Inverter you are able to upgrade and expand your photovoltaic installation at any time. You can expand our Power Battery up to a gross capacity of 11.5 kWh. Our system includes the option to smartly charge your electric car. Whether you just want to use surplus solar energy to load the batteries of your electric car or want to go for a drive in an hours time - both are possible scenarios. With our Power Battery you are already able to charge your car quickly and reliable at 6kW loading capacity.

Last update on 11.05.2017 by Frank Gaspari.

Can I also control my domestic hot water heat pump?

At the moment we can offer four output interfaces from where you can individually control additional appliances. You can manage power on and off conditions  with the RCT Power App. Please ensure that your heat pump carries the SG Ready label.

Last update on 11.05.2017 by Frank Gaspari.

Emergency power or back-up power supply?

Our system is fully certified under the terms of VDE-2510. The Power Switch Box is shippable from 06/17 and can be retrofitted to your system at any time. You can create a three-phase supply (max. 2kW per phase) or a single-phase grid with a connected load of 6kW.

Your photovoltaic installation is fully functional in case of power failure - either your batteries will be charged or you use the generated energy for your private consumption.

Last update on 11.05.2017 by Frank Gaspari.

Which type of lithium-ion batteries are used in RCT Power storage systems?

Our customers attach great importance to battery lifetime and safety. For this reason we exclusively use Lithium-iron-phosphate (LiFePo4) battery cells.

Last update on 11.05.2017 by Frank Gaspari.

What is so special about these LiFePo4 battery cells?

LiFePo4 battery cells are among the safest Lithium-ion batteries on the market. The cell chemistry makes a thermal runaway overheating almost impossible. The cells are inherently safe even under extreme conditions and therefore they don't pose a fire risk.

LiFePo4 battery are characterised by a high cycle stability which translates into a a long lifetime even under intensive load conditions. The very high current carrying capacity of the LiFePo4 battery cells is especially useful when you want to charge your battery quickly. It is also of an advantage when you are thinking of acquiring an electric car. They will help you to securely supply your home and connected appliances in the event of power failure.

Last update on 11.05.2017 by Frank Gaspari.

Why do you co-operate with the Karlsruhe Institute of Technology (KIT)?

The cooperation with Karlsruhe Institute of Technology enables us to offer a bespoke battery management system. The load management system is fine tuned by precise measuring of the battery conditions. It guarantees highest efficiency, long battery lifetime and an ultimate in battery safety.

Last update on 11.05.2017 by Frank Gaspari.

How do you wire up the power battery?

Simple plug-and-play. This YouTube video shows how easy it is!

Last update on 14.05.2017 by Frank Gaspari.

Can I monitor my installation using the RCT Power App?

Yes, the RCT Power App allows you to monitor and commission your installation in a simple manner. It includes system monitoring and comprehensive data visualisation. Together with various configuration options and a "one-click-update" function the RCT Power App provides everything the installer and the end-user expects.

Last update on 11.05.2017 by Frank Gaspari.

Where can I get information about the RCT Power App?

For Android mobile phones you can download the RCT Power App in Google's Playstore.

The RCT Power App includes a pre-set Power Storage installation for demonstration purposes. To load this installation select Tab “NETWORK”. Overwrite Add device line with ‘Demo’ and press the green + button. Demo Power Storage 6.0 has now been added as a new device. Under the “ONLINE” tab you will see a visualisation of the Demo Installation. Touch each symbol for more information. Touch “ONLINE” tab again to get back to visualisation screen. Select Tab “HISTORY” and touch the chart symbol. You will see the performance chart of the Demo installation. A quick double finger touch anywhere in the chart area will call up the chart display options. Simply tick the values you want to be displayed and confirm by pressing “OK”.

Last update on 11.05.2017 by Frank Gaspari.

What are the benefits of predictive load management?

Battery Storage systems operate within a framework of pre-defined conditions. These conditions require that only a set a percentage (e.g. 30%, 50% or 70%) of the generated solar energy is fed in. This load regulation can lead to losses in the region of 10% depending on system layout. Predictive load management will reduce these losses to a minimum while at the same time it will optimise your own consumption. Using pre-defined demand and yield predictions the batteries are only loaded when it is beneficial for the network and your yield. This approach delivers higher specific yield and lower losses caused by load factor regulation. Increased battery lifetime is another positive side effect of predictive load management.

Last update on 11.05.2017 by Frank Gaspari.

Do I need Internet access and will there be additional costs?

No, in cooperation with the Fraunhofer Institute for Solar Energy Systems in Freiburg we have developed a method that does not require external weather data. No chargeable third party weather data and no Internet connectivity is required for our predictive load management system.

Data is stored internally in the inverter. What is the volume of data records or rather how many years of data records can be stored?

  • 5min values of all logged data - 89 days
  • Daily values of all logged data - 11 years
  • Monthly values of all logged data - 85 years
  • Annual values of all logged data - 1000 years

 

Last update on 11.05.2017 by Frank Gaspari.

What are the benefits of Max Power Control when solar panels are shaded?

Partial shading of photovoltaic installations generally results in reduced yield. Costly solar module optimisers can reduce this decrease in yield to a minimum.

Max Power Control is based on an internal control strategy at string level that always adjusts modules to the maximum power point (Global MPP) during partial shading conditions. Similar to the module optimisers the decrease in yield is minimised for the affected solar panels.

Max Power Control optimises the yield from your system - just very smart and without the added costs!

Last update on 11.05.2017 by Frank Gaspari.

Data is stored internally in the inverter. What is the volume of data records or rather how many years of data records can be stored?

  • 5min values of all logged data - 89 days
  • Daily values of all logged data - 11 years
  • Monthly values of all logged data - 85 years
  • Annual values of all logged data - 1000 years

Last update on 11.05.2017 by Frank Gaspari.

How do I connect the Power Storage System with the Power Sensor?

Clamp the three current transformers over each phase conductor leading to the consumption meter of your house connection. Then clamp the control unit into the top hat rail of the subunit. Now run a data cable with RJ45 connectors from the control unit to the Power Storage.

That's all! You don't have to set the Power Sensor parameters nor do you need to consider current direction and phase position. You need four subunits for the sub-distribution. With a distance of 20- 30m between Power Storage and Power Sensor you have all the flexibility you need

Last update on 11.05.2017 by Frank Gaspari.

The Power Sensor operates on the current loop principle, i.e. an analogue signal is processed and transmitted. Is this correct?

This is correct. The Power Sensor transmits analogue values back to the inverter for all measured currents. The Power Sensor is connected to the inverter by a separate cable (Maximum permitted length is 30m).

Last update on 11.05.2017 by Frank Gaspari.

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