Photovoltaics
Photovoltaics includes solar panels, inverters, battery storage and installation accessories for residential and commercial PV systems. Choose panels by brand and output (Wp), inverters by power and number of phases (1-phase / 3-phase), and batteries by usable energy (kWh) and voltage (low-voltage / high-voltage). Everything needed to build a complete solar power system in one category. Guide
We offer a wide selection of photovoltaic panels ideal for domestic and commercial applications. You can choose from our AEG, Aiko Solar, Canadian Solar, Hanersun and Jinko Solar brands. High quality and reliability of the panels are guaranteed, as they are one of the leading manufacturers in the industry.
In addition to the panels, you will also find inverters in this category, essential for converting solar energy into electricity suitable for household appliances. The inverters are reliable, efficient and easy to install. You can choose the inverter according to the brand, the power itself or the number of phases.
For those who want to maximize the use of solar energy, we also offer different types of batteries. These batteries allow excess energy to be stored for later use, making them ideal for areas with limited access to the power grid, increasing energy independence, or efficient use of stored energy. We offer batteries from quality manufacturers in brands such as AEG, BYD, Dyness, Goodwe, Huawei, LG ES, Marstek, Pylontech, SolarEdge, Solinteg, Solis, Soluna, Victron Energy, and Vision Battery. Another option is commercial energy storage. You can also choose by voltage from both low-voltage and high-voltage batteries.
Finally, our category includes many accessories, including smart meters LAN, or Wi-fi modules, Optimisers, Monitoring devices, Solar heating and Connectors
With our comprehensive range of photovoltaic systems, you will step towards a more sustainable future. For more information or individual advice, please do not hesitate to contact our team of experts, who are ready to assist you in choosing the ideal solution for your needs. Discover the power of solar energy with us and start your journey to a greener and more efficient home today!
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Related photovoltaic categories
Photovoltaics: components, selection and compatibility
This category brings together everything a complete solar system is built from: photovoltaic modules, inverters (grid-tie, hybrid, off-grid and microinverters), battery storage, mounting systems and electrical installation material.
You can choose from brands such as AEG, Aiko Solar, Canadian Solar, Hanersun or Jinko Solar, with the filters in the left column.
FROM THE FIELD
"When you design a system, first decide whether you want battery readiness. That determines whether you go for a hybrid or a grid-tie inverter. Then match the number of inverter phases to the grid connection, and only at the end fine-tune the modules by output and cell technology. The opposite order means redoing the design."
Ladislav Proc · Photovoltaics specialist, ONSA Plus
How to choose a photovoltaic system
A photovoltaic system should serve you for twenty years, and its parts complement each other rather than replace each other. That is why the order in which you approach the selection matters. Most redone designs start from the modules, although modules should come last.
First decide whether you want battery readiness. That sets the inverter type. Then match the number of phases to your grid connection, which sets the power ceiling. And only at the end pick the modules by output in Wp, cell technology and connector type.
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What a photovoltaic system contains
Modules generate direct current, the inverter converts it to alternating current, optional batteries store energy, and the supporting parts, that is mounting, cabling, connectors and protection, hold the whole thing together. The right combination depends on the type of installation, the roof structure and whether you are aiming at self-consumption or backup.
How to choose photovoltaic modules
Start with the module output in Wp and the available roof area. Then compare the module type, monofacial or bifacial, and pick the cell technology: TOPCon, N-type monocrystalline, HJT or Mono PERC. Finally check the practical details such as frame colour and connector type, most often MC4.
- Higher Wp cuts the number of panels you need, but it takes enough space and a compatible string design.
- Bifacial modules gain extra yield when there is enough spacing and a light surface underneath.
- TOPCon, N-type and HJT are chosen for efficiency and behaviour at higher temperatures, Mono PERC is the more affordable option.
Tip from practice
Match the number of inverter phases to the grid connection before you pick the modules. A single-phase inverter on a three-phase connection causes phase imbalance and the grid operator may not approve the connection.
Which inverter type you need
The inverter decides how the system works with the grid and whether it can handle a battery. You can filter by type.
- Grid-tie: standard connection to the grid, focused on generation and self-consumption.
- Hybrid: ready for battery storage, also handles energy flow management.
- Off-grid: for standalone systems with no connection to the public grid.
- Microinverters: mounted on the individual panel, they suit complex roofs and places where shading is a risk.
Choose the number of phases by your electrical connection and target output. Single-phase inverters are common in smaller residential systems, three-phase ones at higher outputs and where the load needs balancing. Always match your choice with the connection conditions of your grid operator.
Battery storage and usable capacity
Batteries raise self-consumption and, with the right design, allow backup as well. Choose by usable capacity in kWh, by charge and discharge power, and by compatibility with the inverter.
- Smaller capacity covers evening consumption and short peaks.
- Larger capacity extends the coverage and raises independence, depending on how the house consumes.
- Check whether your inverter is hybrid, that is ready for a battery, or whether you will need an add-on solution.
Mounting systems and electrical installation material
The reliability of the system rests on safe mounting. Choose the mounting system by roof type and load, and the electrical installation material, that is cables, protection devices and connectors, by safety and regulatory requirements.
Quick component comparison
| Component | What to compare | What it affects |
|---|---|---|
| Modules | Output in Wp, monofacial or bifacial, cell technology, connector, dimensions | Number of panels, use of the roof, yield, cabling compatibility |
| Inverters | Type, number of phases, model series, number of MPPT inputs | Work with the grid, battery readiness, behaviour under shading |
| Batteries | Usable capacity in kWh, model series, power, warranty | Self-consumption, backup, how long you stay independent |
| Mounting and material | Suitability for the roof type, corrosion resistance, load, protection devices | Safety, service life, compliance with regulations, mounting speed |
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Frequently asked questions about photovoltaics
What does Wp on a solar panel mean?
Wp is the rated output of the panel under standard test conditions. It lets you compare modules with each other, while the actual output depends on temperature, irradiation and installation conditions.
Are 500 W panels suitable for a family house?
Yes, if the roof and the structure can take the size and weight of the panel. Panels with higher Wp cut the number of modules, but the design still has to fit the limits of the inverter and the string.
What is the difference between a bifacial and a monofacial module?
A monofacial module generates mostly from the front side. A bifacial one also picks up light reflected from below, which raises the yield when there is enough spacing and a light surface underneath.
TOPCon, N-type, HJT or Mono PERC?
These are cell technologies with different properties. TOPCon, N-type and HJT are chosen for efficiency and behaviour at higher temperatures, Mono PERC is the more affordable option.
Which connector is more common, MC4 or EVO2?
MC4 is the most widespread in the industry, EVO2 shows up only on selected product lines. Always match the connector type with your existing cabling and accessories.
Do I need a single-phase or a three-phase inverter?
It depends on your grid connection and target output. Single-phase is common in smaller residential systems, three-phase at higher outputs and where the load needs balancing.
What is the difference between a hybrid and a grid-tie inverter?
A grid-tie inverter feeds the generated power into the grid and into self-consumption. A hybrid inverter is ready for a battery and also handles energy flow management.
Can I add a battery later?
Often yes, but it depends on the inverter and how the system is wired. Hybrid inverters are ready for a battery, with grid-tie ones you need an add-on solution or a change to the wiring.
How do I estimate the battery capacity I need?
Start from the consumption outside generating hours, that is evening and night, and from peak draws. Then choose the usable capacity by your goal, whether you want higher self-consumption or longer backup.
When do optimisers or microinverters make sense?
On roofs with several orientations or with partial shading, where control at the level of the individual module cuts the losses from uneven irradiation.
Final system sizing and compliance with regulations depend on the installation site, the grid operator's conditions and the technical design.
About ONSA Plus
Why installers across Europe work with us
ONSA Plus is a European B2B distributor of photovoltaics, battery storage, heat pumps and EV charging stations. In our own EU warehouses we keep over 1,500 products from 25+ brands, including Huawei, Solis, SolaX and Dyness.
We are not just a trading company. We design and service energy systems ourselves, so we answer questions on sizing and compatibility from engineering practice, not from a catalogue. You handle a warranty claim directly with us and you buy per job.
