How a German Solar Wholesaler Turned Checkout Add-Ons Into €123K in Upsell Revenue
This case study in 30 seconds
- What happened: B&M Distribution, a German B2B solar-equipment wholesaler on Shopify, generated €123,040.33 in lifetime upsell revenue using WB: Frequently Bought Together.
- The catch: €22,382.51 of that — 18% of the all-time total — came in the last 30 days alone. The upsell channel is accelerating, not flat.
- Who this is for: Shopify merchants selling high-ticket or B2B products who assume upsell apps are a low-margin, DTC-only tactic.
In this case study
- Who is B&M Distribution
- The challenge
- How WB: Frequently Bought Together runs on their store
- The results
- What this means for your store
- Frequently asked questions
Most Shopify upsell app case studies come from apparel or beauty brands selling $30 add-ons. B&M Distribution sells solar battery storage systems, inverters, and PV modules — items that run from €75 for a solar panel to over €5,000 for a full battery bank. That's a different kind of cart, and it turns out a different kind of upsell opportunity.
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Who is B&M Distribution
B&M Distribution GmbH (bm-distribution.shop) is a German wholesale distributor of solar components — inverters (Sungrow, Kostal, GoodWe, SMA, Fronius, Huawei), battery storage systems (BYD, Dyness, Fronius, GoodWe, Sungrow), solar modules, EV wallboxes, and mounting/cabling accessories. The company operates from a ~6,000 m² warehouse in Weissach, Germany, runs on its own solar power, and sells to both retail and registered trade (Gewerbekunden) customers at wholesale pricing.
This is a B2B/prosumer catalog: multi-hundred to multi-thousand-euro tickets, technical products, and customers who often need several compatible parts in the same order — not a single impulse add-on.
The challenge
Solar hardware purchases are rarely single-SKU. An inverter needs the right mounting brackets and cabling. A battery module often needs a BMS/BCU unit or an expansion pack to hit the customer's target capacity.
For a B2B wholesaler, the risk of not surfacing these pairings at checkout isn't a missed $5 add-on — it's a customer who orders an inverter, forgets the mounting kit, and either places a second order later (extra shipping, extra admin) or doesn't reorder at all.
How WB: Frequently Bought Together runs on their store
WB FBT surfaces AI-driven "frequently bought together" bundle recommendations that merchants can still filter and override by product, collection, tag, type, or vendor — rather than a fully automated black-box recommendation engine. On a technical B2B catalog like B&M Distribution's, that manual control matters: a generic algorithm might pair a solar panel with an unrelated accessory, but rule-based filtering keeps recommendations compatible (e.g., BYD battery accessories only with BYD batteries).
The results
| Metric | Value |
|---|---|
| Lifetime upsell revenue | €123,040.33 |
| Upsell orders (lifetime) | 244 |
| Total lifetime orders | 9,895 |
| Upsell attach rate | 2.5% of all orders included an upsell |
| Average upsell value per order | ≈€504 |
| Upsell revenue, last 30 days | €22,382.51 |
| Last 30 days as % of lifetime total | 18.2% |
Two things stand out here. First, the average upsell add-on — about €504 — is roughly what you'd expect from attaching a battery expansion module or a premium inverter accessory, not a $10 impulse buy. High-ticket catalogs produce high-ticket upsells; the mechanism doesn't only work for cheap add-ons.
Second, nearly a fifth of all upsell revenue this store has ever generated came in in just the last month. That's not a one-time spike from a single big order — at 2.5% attach rate across 1,823 orders in the same 30-day window, it points to the upsell program compounding as the store's order volume grows, not plateauing.
What this means for your store
This is one store's result, not a guaranteed outcome — B&M Distribution's high average order value is a big part of why the upsell revenue number is large. A store selling $20 items will see a different absolute number even at a similar attach rate. What generalizes is the mechanism: surfacing genuinely compatible add-ons at checkout captures revenue that would otherwise require a second order, a support ticket, or a lost sale — and that holds whether the add-on is a $5 accessory or a €500 battery expansion.
Install WB: Frequently Bought Together free → — free plan covers up to 50 orders with no expiry; paid tiers start at $19.99/mo for stores doing up to 200 orders/month.
Frequently asked questions
Does a Shopify upsell app work for B2B or high-ticket stores, not just DTC?
Yes — B&M Distribution's results show the same mechanism (surfacing compatible add-ons) works on a catalog with items from €75 to over €5,000, producing a per-order upsell average around €504.
What's a realistic upsell attach rate?
B&M Distribution's attach rate is 2.5% of all orders — one store's result, not an industry benchmark.
How much can an upsell app add to Shopify revenue?
It depends heavily on average order value and catalog fit. B&M Distribution generated €123,040.33 in lifetime upsell revenue on a high-ticket B2B catalog — a lower-AOV DTC store would see a different absolute number even at a similar attach rate.
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Written by Dhvanit.
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