German startup Wattando has developed a 2.46 kW rooftop PV system that can be connected directly to a household’s network via an existing cable, without disrupting existing electrical systems.
“It is a kind of XL plug-in solar system,” says Stefan Ulfert, co-founder of Wattando. pv magazine. “This is made possible by our Wattster management system, which ensures secure and wireless radio communication to the grid connection point and the home network.”
Boris Klebensberger, director and co-founder, said the management system adjusts the feed-in according to the standards integrated into the cable’s overload protection.
The system is more expensive than classic PV installations. In many cases, however, the AC connection can be made cheaper. For households that can only benefit from PV and home storage with a non-invasive solution, the company believes this solution may be the only option.
Wattando recommends the implementation of systems such as zero-feed systems.
“From our point of view, replacing the meter would not be absolutely necessary if there were no feed-in, because by setting the physical or arithmetic zero we can prevent feed-back from happening behind the meter,” Klebensberger said. “What is important from the customer’s point of view is a balance meter.”
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