Batteria Domestica Payback Period Calculator

The basic formula

"Is a batteria domestica worth it?" It is the question we hear most often. The honest answer: that depends on your situation. But with the right calculation, you can predict it fairly accurately. In this article, we show you how to calculate the periodo di ammortamento, with concrete scenarios and current 2026 prices.

Sounds simple, but the annual savings consist of several components:

• Avoided feed-in — elettricità you store instead of feeding back at a low rate
• Dynamic tariff advantage — charge cheaply, discharge at a high rate
• Avoided costi di immissione — some suppliers charge fees for feeding back to the grid
• rimborso IVA — one-off 21% of the purchase price

Scenario 1: Average nucleo familiare with pannelli solari

Ipotesi: 12 pannelli solari, 4,200 kWh generation all'anno. 3,800 kWh annual consumption. 60% of generation is attualmente fed back (2,520 kWh). Energy purchase price: €0.28 per kWh. Feed-in tariff after 2027: €0.07 per kWh. Home batteria: 10 kWh, purchase price €4,500.

Savings calculation all'anno

Periodo di ammortamento calculation

With an expected lifespan of 15-20 years, you continue to earn €463+ all'anno for 7-12 years after the periodo di ammortamento. That is a total return of €3,200-5,500 over the lifespan. Periodo di ammortamento: 7.7 years.

Scenario 2: Small nucleo familiare, plug & play batteria

Ipotesi: 8 pannelli solari, 2,800 kWh generation all'anno. 2,500 kWh annual consumption. Home batteria: 5 kWh plug & play, purchase price €1,800.

Calcolo

Plug & play batterie often have a shorter periodo di ammortamento due to the lower purchase price and the absence of costi di installazione.

Scenario 3: Large nucleo familiare with pompa di calore

Ipotesi: 20 pannelli solari, 7,000 kWh generation all'anno. 8,000 kWh annual consumption (including pompa di calore). Home batteria: 15 kWh hardwired, purchase price €7,000 + €500 installazione.

Calcolo

With a large system, the absolute savings are higher, but the periodo di ammortamento is slightly longer due to the larger investment. Tuttavia, the total return over the lifespan is considerevolmente greater.

Factors that shorten the periodo di ammortamento

1. Dynamic contratto energetico

With a contratto dinamico, you can actively trade on elettricità prices. Charge at €0.05/kWh, discharge when the price is €0.35/kWh. This can yield €100-400 extra all'anno, depending on your capacità della batteria and how actively you trade.

2. Rising prezzi dell'energia

The calculations above are based on current prices. If prezzi dell'energia rise by 3% all'anno, your savings increase each year and the periodo di ammortamento shortens by 1-2 years.

3. Feed-in costs

An increasing number of fornitore di energias charge costi di immissione. This makes a batteria domestica extra profitable because you avoid those costs.

4. rimborso IVA

The one-off 21% rimborso IVA reduces your net investment directly. This is a significant advantage — on a batteria of €5,000, that saves €1,050.

5. Subsidies

In some municipalities and provinces, incentivi are available for batterie domestiche. Always check the current schemes with your municipality and on the RVO website.

Factors that lengthen the periodo di ammortamento

• Low own consumption — If you use little elettricità, you won't fill the batteria daily
• Few pannelli solari — Less surplus means less to store
• Fixed contratto energetico — No advantage from tariffe dinamiche
• Expensive system with high costi di installazione — The investment is larger
• North-facing roof — Less generazione solare

Comparison: periodo di ammortamento by batteria type

The sweet spot for most nuclei familiari: a 10 kWh system with a periodo di ammortamento of 6-8 years.

Domande frequenti

Is a batteria domestica profitable in 2026?

Yes, for most nuclei familiari with pannelli solari, a batteria domestica is profitable with a periodo di ammortamento of 6-10 years. Soprattutto after the regime di scambio sul posto ends in 2027, the financial advantage grows. Assume a net return of 8-12% all'anno on your investment.

How do I calculate my own periodo di ammortamento?

Take your annual surplus solare (kWh that you feed back), multiply this by the difference between your prezzo dell'energia and the tariffa di immissione, add any tariffa dinamica advantage, and divide the net purchase price (after rimborso IVA) by this annual savings.

What is the periodo di ammortamento without pannelli solari?

Without pannelli solari, the periodo di ammortamento is longer: 10-15 years. You only earn on the difference between cheap and expensive hours with a dynamic contratto energetico. This yields €150-350 all'anno, depending on your strategy and capacità della batteria.

Conta l'aumento del valore dell'immobile?

A batteria domestica can increase the value of your property, similar to pannelli solari. Tuttavia, this is not included in the standard periodo di ammortamento calculation. It is an additional benefit.

What about degradazione della batteria?

Batterie domestiche gradually lose capacità, similar to a phone batteria but much more slowly. After 10 years, a good batteria LFP still has 80-90% of its original capacità. This effect is small and already accounted for in the produttore's garanzia terms.