Buying a Photovoltaic System with Storage: 8–10 kWp with BYD at a Fixed Price

At PVPro Solar, buying a photovoltaic system with storage means a package of a PV system and a BYD battery. Before you decide, you get separate guide prices for PV alone, PV with storage, and optional backup power. If you already have a PV system and only want to add a battery, this isn’t really the right page. Read retrofitting a solar battery instead. Request your free, no-obligation quote now.

Photovoltaic System with Storage: Key Facts at a Glance

One Package: A Photovoltaic System with Storage

The battery size depends on your consumption. For most households with an 8–10 kWp package, the HVS 7.7 fits. With higher evening consumption or a heat pump, the HVS 10.2 is usually the better choice. With lower consumption up to about 3,500 kWh a year, the HVS 5.1 is often enough.

The Fronius inverter has an extra benefit. If you register it free of charge in Fronius Solar.web within 30 months of commissioning, you get a 10-year manufacturer’s warranty, which can be extended to 15 years for an additional fee. The BYD battery comes with a 10-year warranty: BYD guarantees that it retains 60% of its usable energy during this period or reaches a minimum energy throughput. Online registration is required.

Guide Prices: PV Alone, with Storage, with Backup Power

The following figures are guide prices, not a fixed price for your roof. We give you your actual price in writing after the on-site visit. After that, it no longer changes, even if material prices move before installation. Payment follows the 30/70 model: 30% when the contract is signed and 70% after commissioning, not the full amount in advance.

All prices are final prices with 0% VAT, including installation, electrical connection and registration.

Why Online Kits Look So Cheap

Online shops offer 10 kWp kits with a battery for about €5,000 to €9,500. These are hardware-only packages, though: installation, scaffolding, electrical connection, meter cabinet, registration with the grid operator and commissioning are missing, and only a registered electrical contractor may connect the system to the grid anyway. Turnkey installed systems with 10 kWp and about 10 kWh of storage cost about €18,000 to €26,000 according to guides. So always compare complete prices with the same scope, the same usable battery capacity and clear model numbers.

How Large Should Your System with Storage Be?

Here’s an example. A four-person household using around 5,000 kWh a year often manages with an 8 kWp system in Hanover. At around 893 kWh of yield per kWp per year, it produces about 7,100 kWh a year, which is more than the annual consumption. Without a battery, part of the midday power that isn’t used directly goes into the public grid. With the BYD battery, more of it is stored for the evening instead of being fed in. If your consumption or roof area doesn’t fit this example, you’ll get an individually calculated size at the on-site visit, not a template.

For the battery, HTW Berlin’s rule of thumb is at most about 1.5 kWh of usable capacity per 1,000 kWh of annual consumption. For the household using 5,000 kWh, that’s up to 7.5 kWh, exactly the size of the HVS 7.7. A battery that is too large rarely fills up in autumn and winter and lengthens the payback period.

Is a Photovoltaic System with Storage Worth It?

With a battery, a household uses about 55–70% of its solar power itself instead of about 25–35%. Every kilowatt-hour you use yourself replaces grid power at an assumed 37 ct instead of being fed in for about 7.70 ct. The PV system without a battery usually pays for itself after about 10 to 12 years, the battery alone after about 12 to 14 years, faster with high evening consumption and rising electricity prices. A detailed worked example is under 10 kWh battery storage price.

PV Point or Whole-House Backup: Two Levels of Backup Power

The Fronius GEN24 Plus has the PV Point function built in. It is a single socket wired to the inverter that keeps working during a grid outage in the daytime when there is enough sun, even without a battery. If you want to keep the whole house supplied during an outage, including at night and regardless of the weather, you also need the battery and a backup box. Each level has its own surcharge, as shown in the table above. Neither is automatically included in the basic package. More under solar backup power systems.

Buy or Rent?

With PVPro Solar you buy the system and battery, and both are yours from day one. Rental models often run for around 20 years and usually cost considerably more over the term. If you don’t want to pay everything at once, you can finance the purchase with the KfW 270 loan, and thanks to the 30/70 model you pay most of it only once the system is running. More under buying a photovoltaic system in Hanover.

The Process We Follow

1. Call or form. You give us your postcode, approximate annual consumption, and whether you want storage and backup power.
2. On-site visit. We check the roof, structure and meter cabinet. We also check the location for the BYD battery and the cable routes a backup box would need.
3. Written quote. It shows the price for PV, storage and your chosen backup level, broken down as in the table above.
4. Installation. Mounting, electrical connection and integration of the battery. We also register the system with your grid operator (in the Hanover region usually enercity Netz or Avacon) and in the Market Master Data Register (MaStR).

VAT When Buying a System and Battery

If you buy a PV system and battery for a residential building, the zero VAT rate under Section 12(3) UStG has applied since 1 January 2023 to the whole package, including the battery. That means 0% instead of 19%. It applies to supply and installation on or at residential buildings, including rented houses. A battery retrofitted later can also qualify for the zero rate. You can find details under retrofitting a solar battery.

Already Have a PV System but No Battery Yet?

Then you don’t need a new PV package, just the battery. We cover this on a separate page: retrofitting a solar battery.

A Completed Project

Our project in Rethen, in the Hanover district, is an example of exactly this package. It is a 10.23 kWp system with 24 JA Solar modules (425 Wp each), a Fronius GEN24 Plus and a BYD HVS 10.2, with a total investment of €21,400. That price applies to this roof and this order; your fixed price depends on your roof, meter cabinet and components. The yield forecast for this roof is around 9,800 kWh a year. That is a roof-specific value and is above our standard value of 893 kWh per kWp. You can find more projects under our references.

Funding for Photovoltaics with Storage

• KfW 270 loan: the “Renewable Energy – Standard” loan lets you finance the system and battery at a low interest rate. It is a loan, not a grant.
• proKlima DachVollToll: in Hanover, Hemmingen, Laatzen, Langenhagen, Ronnenberg and Seelze, fully covered roofs on residential buildings receive €100 per kWp, up to €2,000, for the PV system. According to proKlima, applications for 2026 are possible until 31 October 2026, and you must apply before placing the order.
• The Hanover Region’s Dach-Solar programme: funds the module area, not the battery.
• 0% VAT on the system and battery for residential buildings.

There is no nationwide grant for private batteries. We have summarised the current funding in Hanover and the surrounding region, and how to apply, under solar funding in Hanover. Important: always submit funding applications before the project starts.

Conclusion

Buying a photovoltaic system with storage from us means a package with a BYD battery and separate guide prices for PV, storage and backup power. There’s no technical lecture on lead-acid or redox-flow batteries, which we don’t install anyway. Request your free, no-obligation quote now. If you’d like the PV system first and to decide on the battery later, see buying a photovoltaic system in Hanover. For more on the battery itself, see BYD battery storage.

Note: This article provides a general overview (as of October 2026) and does not replace tax or legal advice.

Frequently Asked Questions About PV Systems with Storage