Frequently asked questions

ONSA Plus is a European B2B wholesale distributor of solar PV, battery storage, heat pumps and EV chargers for professional installers. We hold 1,500+ products from 25+ brands in three EU warehouses and deliver to all 27 EU countries. We are an authorised Solis distributor. Unlike a pure trading house, we design and install energy systems ourselves, so the technical advice you get comes from that practice.

All 27 EU countries. Orders ship from our own three EU warehouses, so goods start close to your market rather than crossing the continent. Our largest markets are Germany, Romania, Poland, Czechia, Austria, Hungary, Greece and Slovakia.

The full energy stack for one project: photovoltaic panels and inverters, battery storage, mounting systems, heat pumps and EV chargers, with 1,500+ products held in stock. You can filter the catalogue by power output, number of phases and other installation parameters.

25+ manufacturers, including Huawei, Solis, SolaX and Dyness. We stock premium brands only, so every product comes with an established manufacturer's warranty and support behind it.

In-stock items are dispatched within 24 hours. We hold stock in three EU warehouses rather than in one central depot, so goods start from a warehouse near your market. Delivery times vary by country; lead times and terms per destination are listed on the shipping and payment page.

Yes. We ship to your premises or straight to the installation site, so the material is ready where your crew works and does not hold up the job.

No. You order what a job actually needs, a few panels or a single inverter, without committing to a full pallet. Distributors that impose bulk minimums make you tie up cash in stock you do not need yet.

Yes, from a dedicated specialist rather than a ticket in a queue. Your contact knows the products from our own installations. Ask about sizing, compatibility, or which inverter and battery work together, and you get a straight answer.

The manufacturer. Warranty claims go directly to the manufacturer's support team, which handles diagnosis and replacement for its own products. Our support page at onsaplus.eu/support lists the right contact for each brand we stock.

Yes, after you log in to your partner account. You see real stock availability and your individual prices, so you can plan an order without waiting for a quote.

Register for a partner account on onsaplus.eu. We approve new registrations within 24 hours, after which you see live stock and your own pricing. There is no minimum order and no annual volume commitment to open an account.

Large distributors optimise for volume buyers: bulk minimum orders, one central warehouse and support through a ticket queue. We deliver across all 27 EU countries from three EU warehouses, dispatch in-stock orders within 24 hours, have no minimum order and give you one named specialist instead of a queue. We also design and install energy systems ourselves, so the technical advice comes from installation practice. Nine out of ten of our customers order again.