When you ask an automotive electronics PCB assembly supplier for a quotation, the first number you receive often looks deceptively simple. The problem is that for two- and three-wheel electric vehicle factories, that number rarely tells you the full cost of getting a working controller, charger, or BMS into production. We work with procurement teams across Europe who are tired of receiving quotes that omit critical steps like component sourcing risk, test fixture design, or the cost of consolidating a fragmented BOM. So, let us walk you through how we handle quotation requests and what you can do to make the process clearer from your side.
What a useful PCB assembly quotation actually contains
A direct answer to the question most buyers ask us: a reliable quotation for automotive electronics PCB assembly should list not only the price per board, but also the assumptions behind that price. For an electric scooter or motorcycle, the PCB is rarely the most expensive part. The real cost drivers are the active components (MCUs, gate drivers, MOSFETs), the connector selection, and the testing strategy. When we send a quote, we include a clear breakdown of PCBA cost, component cost, and assembly cost. But more importantly, we state the lead time for each critical component and the risk of obsolescence.
Technical reference: For related engineering context, see IPC standards and industry resources.
If you are evaluating a supplier quotation, check for three specific line items: NRE (non-recurring engineering) for test fixtures, a defined sampling plan, and the cost of conformal coating or potting if your vehicle operates in wet conditions. If those items are missing, the quote is incomplete. We always include them because a controller that fails after 10,000 km due to moisture ingress is a warranty problem, not a component problem.
Why your BOM is the real bottleneck
We see the same pattern repeatedly. A factory in Milan or Barcelona sends us a BOM with 80 line items. Some components are from distributors, some are direct from manufacturers, and a few are marked as "customer supplied." That is where the confusion starts. For a two- or three-wheeler, the BOM often includes a mix of automotive-grade and commercial-grade parts. The purchasing team knows the difference, but the assembly supplier might not. We ask you to mark the operating temperature range for each board. Is this a hub motor controller that lives near the wheel? Or a central VCU (vehicle control unit) mounted under the seat? The answer changes the component selection and the price.
Our role is to consolidate that BOM into a single purchasing stream. We do not simply take your list and buy from the cheapest distributor. We check for alternate sources, compare lifecycle status, and flag parts that are approaching end-of-life. For example, a specific MOSFET might be available today but have a short remaining lifespan. If we do not flag it, you could be redesigning the board in 18 months. That is the kind of practical advice we give before we send a final quotation. The goal is to make your purchasing clearer, not to add another layer of opacity.
How to structure your RFQ for faster, more accurate pricing
You can speed up the quotation process significantly by sending a structured RFQ. Here is the information we need from you, and we recommend you ask every potential supplier for the same list:
- Target annual volume and expected ramp-up schedule. A quote for 500 units per year is different from 5,000 per month.
- Complete BOM with manufacturer part numbers, not only distributor SKUs. Include quantities per board and any known alternates.
- Gerber files and a bill of materials that matches the revision you want quoted. If you send revision A and we quote it, then you send revision B, the price changes.
- Testing requirements. Do you need a full functional test, or just an in-circuit test? For automotive safety-related boards, we recommend a full functional test, but you need to specify it.
- Packaging and delivery terms. Are you shipping to a single location in Europe or multiple sites?
When we receive this information, we can usually provide a preliminary quote within three working days. A detailed quote with component risk analysis takes longer, but it is worth the wait. We have seen factories lose money by accepting a low quote that did not include test development or component escalation costs.
A practical table for comparing supplier quotations
To help you compare offers from different suppliers, we use a simple scoring table. You can replicate this in your own evaluation process. It forces you to look beyond the unit price.
| Evaluation Criterion | What to Look For | Why It Matters |
|---|---|---|
| Component sourcing strategy | Single-source vs. alternate sourcing plan | Prevents line stoppages due to shortage |
| Test coverage | ICT, AOI, and functional test description | Reduces field failures and warranty costs |
| Lead time transparency | Separate lead times for PCB, components, assembly | Helps you schedule production realistically |
| DFM feedback | Supplier provides specific, actionable suggestions | Shows they understand manufacturing, not only assembly |
| Communication responsiveness | Time to answer technical questions | Indicates how they will handle urgent issues later |
We use this table internally when we review our own performance. It is easy to say you are a good partner, but harder to prove it with clear criteria. When you evaluate us or any other supplier, ask for a similar breakdown.
DFM feedback: the part of the quote that saves you money
DFM stands for Design for Manufacturing. When we receive your Gerber files, we run a review before quoting. We look for common issues in electric vehicle PCBs: insufficient clearance between high-voltage and low-voltage traces, vias placed too close to pads, or connectors that are mechanically weak for the vibration levels of a two-wheeler. We do not charge for this initial review because it is part of our service. But we do expect you to listen to the feedback.
For example, a customer recently sent us a design for a 72V battery management system. The trace spacing was too tight for the voltage rating, and we flagged it. They redesigned the board, and the cost increased slightly due to a larger PCB. But the reliability improved dramatically. That is the kind of conversation we prefer to have before you send the board to a cheaper supplier who might not notice the issue. Our DFM feedback is not about inflating the price; it is about reducing the risk of field failures. You can read more about our approach to pcbManufacturing and how we integrate DFM into the early stages of your project.
Component consolidation: how we simplify your purchasing
One of the main services we offer is BOM consolidation. Instead of you dealing with five different distributors and two direct manufacturers, we handle the entire component purchasing. This is particularly useful for electric vehicle factories because your BOM often includes long-lead items like custom connectors or specific battery management ICs. We consolidate those into a single order, which reduces your administrative workload and often improves pricing due to volume.
We also maintain a stock of common components for two- and three-wheelers, such as standard MOSFETs, gate drivers, and current sensors. This does not mean we guarantee stock, but it means we know the market availability. When a component is scarce, we tell you immediately and suggest an alternative. That is the kind of proactive communication that saves your production schedule. If you are looking for a complete assembly service, we offer pcba solutions that include component sourcing, assembly, and testing under one roof.
The testing question: what we recommend for electric vehicles
Testing is the most underrated part of PCB assembly. For a two-wheeler, the environment is harsh: vibration, temperature swings, and exposure to water. A basic ICT (in-circuit test) checks for solder defects, but it does not verify that the firmware works or that the board functions at the correct voltage. We recommend a functional test that simulates the actual operating conditions. For a motor controller, this means applying a simulated throttle signal and checking the output to the motor. For a charger, it means testing under load.
When you request a quotation, ask specifically about the test procedure. If the supplier says "we do standard testing," ask what that means. You want a written test specification that you can review. We provide this for every project, and it is included in the quotation. It might add a small cost per board, but it is far cheaper than recalling a batch of defective controllers. We have seen factories lose an entire production week because a supplier skipped a thermal cycling test. Do not let that happen to you.
How to get a clear quotation from us
If you are ready to move forward, the fastest way is to send us your BOM and Gerber files through our quote page. We will review them and come back with a structured quotation that includes component risk analysis, DFM feedback, and a clear test plan. We do not promise the lowest price, but we do promise a transparent process. You will know exactly what you are paying for and why.
For a typical electric scooter controller project, our quotation process takes one to two weeks, depending on the complexity of the BOM and the availability of components. We communicate every step of the way, and we flag any issues before they become problems. That is the level of service we provide to factories across Europe, and we are ready to help you with your next project.
FAQ
What is the typical lead time for an automotive electronics PCB assembly quotation?
For a standard project with a complete BOM and Gerber files, we provide a preliminary quote within three working days. A detailed quote with component risk analysis and DFM feedback takes up to two weeks, depending on the number of line items and the availability of critical components. The key is to send a complete and accurate BOM with manufacturer part numbers.
Do you source components from multiple distributors or only from a single supplier?
We source from a network of authorized distributors and direct manufacturers. Our goal is to consolidate your BOM into a single purchasing stream, but we compare availability and pricing across multiple sources to ensure you get the best lead time and cost. We also track component lifecycle status to avoid using parts that are approaching end-of-life.
How do you handle component shortages or obsolescence for older electric vehicle models?
When we identify a shortage or an obsolete component, we immediately inform you and propose an alternative. This might be a drop-in replacement or a minor redesign, depending on the part. We do not wait until the last minute to tell you. For long-term projects, we recommend that you maintain a buffer stock of critical components, and we can help you plan for that.
