Night storage heating with self-generated electricity

Photovoltaic systems generate electricity when the sun is shining. But that is not always the case when you need the electricity, such as running a power heating system. Can you feed the self-generated electricity into an existing night storage heater instead of the grid? Or vice versa: Could night storage heaters serve as electricity storage for self-generated electricity? Answers can be found here.

Fluctuating amounts of electricity

The yield of electricity in photovoltaic systems is not constant. Depending on the strength and duration of the sun, different amounts of electricity are generated. Especially in the winter months, the power yield is already lower than in summer anyway, also the fluctuation range during the day is often higher than in summer.

Electricity for heating

Night storage heaters are a relatively antiquated technology to heat buildings. With a good insulation of the building, however, only small amounts of heat are needed, so that a night storage heating could certainly be sufficient.

The big advantage is that the amount of electricity generated with high fluctuations can be stored directly in the heater and later consumed. Depending on how the heater storage is dimensioned, so there is certainly a certain buffer for the heating.

In addition, electricity could be recharged very cheaply via a new technology. Up to now, the big electricity companies have been looking for a solution to harness the high losses in wind turbines with intelligent temporary storage solutions and have come across night storage heaters.

The lack of electricity, which can not be produced, could thus be replaced very cost-effectively, so the total cost of heating remains at a very low level.

Comparison to other energy storage devices

Storage system for electricity are currently still relatively expensive. For example, battery systems can be priced at around 6,000 euros with a capacity of 4.5 kWh. If higher storage capacities are required, the price increases accordingly.

Although there is also a government subsidy for solar batteries, but the high initial costs are only slightly reduced. The maximum subsidy amount is 600 EUR per household.

If the self-generated electricity is used for heating, but sufficiently powerful buffer memory must be available so that, for example, an infrared heater can be operated with it.

Another possibility is the so-called thermal storage, where the electricity is stored in the form of heated water. Again, the cost is relatively high, the heated water can then only be supplied to a hot water heater.

All in all, night storage heating seems to represent an interesting form of power storage, especially if it already exists.

Feeding problems

Apart from the technical problems with the design of the charging control, there are occasionally also legal problems: Night storage heaters are fundamentally subject to the TAB (Technical Connection Conditions) of the respective regional electricity supplier. Interventions in the charging control are usually prohibited.

One must also pay attention to the height of the charging currents - if the currents are too high, appropriate converters must also be connected upstream.

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