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It is not possible to charge the battery in backup mode via an AC generator connected to the AC connection of the inverter. In backup mode, there is no mains voltage and no mains frequency, so the AC connection is switched off.

Currently, the only way to charge the battery in backup mode is via the PV modules connected directly to the vision one/three hybrid inverter.

The only requirement is that one phase must not be loaded with more than 1/3 of the rated power.

Yes.

Instructions for how to perform a black-start of the system can be found in our online operating instructions.

https://www.solarwatt.co.uk/manuals/solarwatt-battery-vision/operation/restarting-and-black-starting

Does the main AC cable have to be disconnected in this case?

The AC main (grid) cable does not need to be disconnected. The system will immediately switch back to the mains when it is available again.

No. The system must be connected to the power grid. Permanent stand-alone ("island mode") operation is not permitted.

There is no time limit for retrofitting a Battery vision tower with more packs.

However, due to the series connection of the batteries, it should be noted that the ageing process of the battery packs means that the weakest pack always determines the maximum capacity of the battery overall. This means that the later you retrofit packs, less the full capacity of the retrofitted pack can be used. Thanks to the high quality of SOLARWATT Battery vision packs and the extensive Solarwatt guarantees, these technical issues do not play a major role, especially in the first few years.

Another reason not to wait too long with a planned expansion: the product must be available for problem-free retrofitting. Constant technical developments mean that every product reaches the end of its life cycle, i.e. it is no longer produced and therefore there is no longer any possibility of retrofitting. Product discontinuations are announced several months in advance, however, so that existing customers are informed when retrofitting will be possible for the last time.

Yes, the feet are included with the Battery vision top pack, as well as a termination plug for the unused connection of the bottom Battery vision pack.

As a result, you'll need to open the Battery vision top pack box first - even though the installation starts with the bottom pack.