How to Choose BC Solar Modules? Power Range, OEM Customization and Series/Parallel
Keywords: BC module selection, solar module customization, OEM solar module ｜ Target product: SQT BC back-contact solar module ｜ Suggested placement: Blog (EN site)
Search intent: From 5W micro to 180W high power — how to choose BC modules? How to set power, what to customize, how to wire series/parallel?
Quick Answer
BC module selection in four steps: ① Set power (5W-180W covers micro to mid) → ② Set encapsulation (≤12W flexible/bendable, ≥30W tempered-glass rigid) → ③ Set parameters (voltage/current/interface) → ④ Set quantity and series/parallel. OEM customization MOQ 100 pcs; size, power, voltage, interface and color are all customizable.
How to Choose the Power Range
| Application | Recommended power |
|---|---|
| Micro sensor/tracker top-up | 5W (flexible) |
| Small surveillance/IoT device | 12W (flexible) |
| Surveillance point/float-charge system | 30-60W (rigid) |
| Telecom base station/weather station | 100-180W (rigid) |
| Residential roof/small plant | 180W-class, multiple in strings |
Reverse formula: panel wattage = daily energy ÷ sunlight hours ÷ 0.8 (keep margin)
Encapsulation Selection
- ≤12W (flexible): ETFE/PET flexible encapsulation, bendable to curved surfaces (min bending radius ≈ 3-5× thickness)
- ≥30W (rigid): tempered glass + aluminum frame, hail-resistant, standard flat installation
- Curved/irregular surfaces → flexible; long-term outdoor/high power → rigid
How to Wire Series/Parallel
- Series: raises voltage (for long-distance transmission, MPPT input range)
- Parallel: raises current (for high-current charging, expanding same-voltage systems)
- Rule: use the same module model in one string to avoid power loss from parameter mismatch
- Example: 48V system = 4×12V modules in series; 60V controller input = 2×30V in series
- Check parameters before wiring: Vmpp, Voc, Impp must match the controller/inverter
OEM/ODM Customization List
| Customizable | Options |
|---|---|
| Size | Any length/width/thickness |
| Power | 5-180W |
| Voltage/current | Matched to system |
| Interface | MC4/Dupont wire/solder tabs etc. |
| Color | Pure black/all black |
| Frame | Frameless/aluminum/irregular |
MOQ: low for standard models; ≈100 pcs for special customization.
Procurement Pitfalls
- Ask cell grade: A+-grade BC cells vs downgraded cells — big difference in efficiency and lifespan
- Demand degradation commitment: first-year ≤2%, 25-year linear ≤0.4% (put it in the contract)
- Inspect appearance: pure black uniform (no color deviation), no bubbles/scratches on the front
- Test actual power: sample I-V on arrival, compare with rated
- Keep warranty: module warranty years and power guarantee in black and white
FAQ
Q: How much can a 5W BC flexible panel bend?
A: Minimum bending radius ≈ 3-5× module thickness; it can fit moderate curves, but avoid repeated bending and creases. For sharp curves, use an arc bracket.
Q: Do you have a 300W BC module?
A: SQT BC covers 5W-180W; for 300W+, use multiple 180W in series/parallel, or contact us to evaluate a custom solution.
Q: Exporting overseas — are certifications complete?
A: SQT modules support certification documents for target markets (CE/ROHS etc.); confirm the specific list with sales.
Customized All-in-One vs. Sourcing Materials Yourself: Why Choose the SQTlot Module Solution?
| Comparison | Sourcing materials yourself | SQTlot custom modules |
|---|---|---|
| Material quality | Encapsulant grades vary wildly | Material selected by scenario (ETFE/PET/BC/glass), consistent batches |
| Process consistency | Handmade/small workshop, no yield guarantee | Production-line standard process + panel-by-panel testing |
| Certification | Lack of reliability data | Factory-direct, test reports and certification documents available |
| Custom response | High communication cost, uncontrollable lead time | Custom by drawing, full OEM/ODM process support |
| After-sales | No one accountable for quality | Source factory warranty, direct technical team access |
Core logic: BC back-contact modules move all front busbars to the rear, winning on both efficiency and looks. SQTlot BC modules generate more per square metre and tolerate partial shading, suiting projects where efficiency and appearance matter.
BC scenario: premium campus surveillance, villa roofs and vehicle sunroofs want maximum yield without ugly busbars; the clean front also self-cleans better, cutting soiling losses.
B2B Procurement FAQ (MOQ / Lead Time / Certifications / Warranty)
Q: What is the MOQ?
A: Standard modules start at 500 pcs with tiered pricing; custom shapes/colors start at 1,000 pcs, with 5-10 sample pieces arranged first.
Q: What is the lead time?
A: Standard modules ship in 7-10 days; custom tooling + sampling takes 1-2 weeks, and mass production takes 3-4 weeks depending on process and quantity.
Q: Which certifications do you hold?
A: CE / RoHS / REACH / FCC test reports and Declarations of Conformity are available; UL / TÜV certification can be evaluated in advance (lead time and cost apply).
Q: What is the warranty?
A: 5-year module warranty plus 10-year power warranty (≤2% degradation in year one, ≤0.7%/year linear thereafter); terms are written into the contract.
Q: What customization is supported?
A: Size/shape, power/voltage, leads and connectors, adhesive backing, color/LOGO printing; ETFE / PET / BC / epoxy-resin / glass / flexible encapsulation are all available.
Q: Trade terms and payment?
A: EXW / FOB (Shanghai) / CIF supported; standard terms are 30% deposit + 70% before shipment, with monthly settlement negotiable for long-term partners.
About Geningtech
Geningtech (SQTlot brand) is a source factory: BC modules 5W-180W fully customizable, free sizing and series/parallel proposals, flexible MOQ.
💡 Free sizing calculation: Send your load power, site sunlight hours and required rainy-day autonomy to our engineers (sales@sqtlot.com) — free one-on-one sizing, with a proposal & quotation returned within 10 minutes.
Related Reading (Internal Links)
Article provided by Geningtech, an IoT solar power system manufacturer. Product page: BC Back-Contact Solar Modules
