ᐅ Should You Install a Photovoltaic Battery Storage System or Not?
Created on: 2 Dec 2020 17:42
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Heidi1965
Our new build is already quite advanced. Next week, 15 photovoltaic modules with a total output of 5.1 kWp will be installed. We are getting a heat pump with a capacity of 5.12 kWh. Initially, a battery storage system was not planned because we wanted to live in the house for at least one year to monitor our electricity consumption patterns, and then potentially add a battery or expand the photovoltaic system later. Now there is a new program that offers a 40% subsidy for battery storage—but only in connection with new builds. That sounds tempting. Should we go for it? What capacity should the battery have at a minimum? The condition is: "The ratio of system output to usable battery storage capacity must be at least 1.2 kWp to kWh of battery storage. Storage capacity exceeding this ratio is not eligible for funding." Have I understood correctly that only a battery with a capacity of 4.25 kWh would be eligible for funding?
Or is this all too small? Just “play equipment”?
Or is this all too small? Just “play equipment”?
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Pipapelikan17 Dec 2020 13:36Tolentino schrieb:
I had read that home energy storage systems are made from used car batteries. Isn’t that right? That was/is an idea to promote the reuse of batteries because recycling options are limited. However, it can currently still be considered more of a future concept. As far as I know, home energy storage systems are not yet being built or supplied this way today.
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hampshire17 Dec 2020 14:32WilderSueden schrieb:
Car and home battery storage are only partially related.The idea of powering the car directly from the home battery is completely unrealistic. Take a look at the discharge power and capacity of typical home battery systems. It makes more sense to use an intelligent system to charge the car with surplus energy during summer instead of feeding it back into the grid. Of course, this assumes the car is parked at home during the day—that is, for remote workers and second vehicles.Tolentino schrieb:
I had read that home energy storage systems are made from old car batteries anyway. Isn’t that right?Car batteries are almost always lead-acid batteries, while home storage units use lithium-ion batteries.W
WilderSueden17 Dec 2020 20:50Fuchur schrieb:
Car batteries are almost always lead-acid, while home energy storage systems use lithium-ion. An electric vehicle battery is quite different from the starter battery in a combustion engine car. I think the reference was actually to the older propulsion batteries from electric cars. In theory, these could be recycled for use as home batteries, although some companies claim they can recycle lithium-ion batteries so well that they can produce new propulsion batteries from them again.
hampshire schrieb:
The idea of charging the house from the car battery is complete nonsense. Just look at the discharge power and capacity of home storage systems. A sensible approach is to use an intelligent system to charge the car with surplus energy in summer rather than feeding it back into the grid. Of course, this assumes the car is parked at home during the day—so this applies mainly to people working from home or for a second vehicle. That’s obvious anyway. The original point was about the claim that advances in propulsion batteries effectively result in cheap home storage batteries as a byproduct.