Battery or not? Three numbers in your app decide it

Since subsidies ended, the question we hear most from customers who already have panels is the same: should I add a battery? The honest answer is "it depends" — but on only three numbers, and you already have all three in SolarisTrack.

1. How much you export

Open Total consumption and look at the last year. If you export more than 40% of what your panels produce, you have enough spare energy to fill a battery almost every day from March to October. Below 25%, the battery will sit half-empty on many days. It probably doesn't pay off yet.

2. How much you use when the sun is down

In History, compare your 20:00–8:00 consumption with your total. A family that works away and comes home in the evening usually uses 55–65% of its energy at night. That's the gap a battery fills.

3. What you're paid for surplus

Check your bill for the price your supplier credits per exported kWh. In 2026 it has been 4 to 7 cents. A kWh bought at night costs 15 to 22. So every kWh you store instead of exporting is worth about 12 cents more.

The quick sum

A Reserva 10 (10.24 kWh) does about 280 useful cycles a year. If each cycle stores 8 kWh you used to export:

8 kWh × 280 × €0.12 = about €270 a year.

Add outage backup, which doesn't show in the sum but does in peace of mind. At €4,950 installed, payback is around 12–15 years for an average home, and drops to 8–9 years for homes with high evening use (heat pump, EV, pool).

Our advice

• You export over 40% and use a lot at night: yes to a battery.
• You have an electric car: before a battery, look at a Vía charger in solar mode. It usually pays back sooner.
• You export little: wait. Your system is already well sized.

If in doubt, request a review from the app. A technician will call you, not a salesperson.