How to Choose a PET Solar Panel? Power, Size and Voltage Explained
Keywords: PET solar panel sizing, flexible solar panel parameters, how to buy small solar panels ｜ Target product: PET flexible solar panel ｜ Suggested placement: Blog (EN site)
Search intent: Matching a PET flexible panel to your product — how to set power, size, voltage and leads? Full sizing process from parameters to sampling.
Quick Answer
PET panel sizing in 5 steps: ① Set power (daily energy ÷ sunlight ÷ 0.8) → ② Set voltage (match battery/charging module) → ③ Set size (mounting surface + power density) → ④ Set leads (length/connector) → ⑤ Set quantity and sampling. Most consumer electronics use 0.5-5W panels; outdoor small devices use 5-20W.
Step 1: Power
| Use | Reference power |
|---|---|
| Power bank / night light | 0.5-2W |
| Camping light / fan | 2-5W |
| Sensor / tracker | 3-10W |
| Camera / small base station | 10-40W |
- Formula: panel wattage = daily energy ÷ sunlight hours ÷ 0.8
- Example: device uses 8Wh/day, 4h sunlight → 8÷4÷0.8 = 2.5W
Step 2: Voltage
| Charging target | Recommended panel voltage |
|---|---|
| Single Li-ion 3.7V | 5-6V panel |
| Two-cell Li-ion 7.4V | 9-10V panel |
| 12V lead-acid/LiFePO4 | 17-18V panel |
| USB 5V direct | 6V panel + regulator |
Voltage mismatch = never fully charged or fried devices — the most common mistake.
Step 3: Size
- Area determines power: A-grade monocrystalline ≈ 130-160W/m² (panel area)
- Example: 2.5W panel ≈ 0.016-0.02m² ≈ 10×16cm
- Measure the mounting surface first, then set power — don’t “pick power then find it doesn’t fit”
Step 4: Leads and Connectors
- Lead length: reserve 20-30% margin per mounting position
- Connector: USB/Micro/XH2.54/bare wire per device interface
- Waterproofing: seal lead roots / use waterproof connectors for outdoor projects
Step 5: Sampling Verification
- Ask the factory for engineering samples (same spec)
- Measure open-circuit voltage, short-circuit current, power
- Install in the real environment for 1-2 weeks, watch the charge curve
- Confirm before mass production — sampling is cheap, rework is expensive
FAQ
Q: How to tell if panel wattage is exaggerated?
A: Measure at noon under sun with a multimeter: open-circuit voltage near Voc and short-circuit current near Isc means roughly real; generic brands commonly exaggerate 30-50%. Trust measurable parameters and warranty.
Q: How thin can PET panels be?
A: PET lamination is typically 1-2mm; thinner ultra-thin encapsulation (0.5-1mm) is possible, but strength and waterproofing drop — trade off by scenario.
Q: Can I get custom shapes (round/irregular)?
A: Yes — Geningtech supports round, hexagonal and other irregular custom cutting; irregular panels have lower power density than rectangular and slightly higher cost.
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: Consumer-electronics buyers care most about BOM cost and production consistency. SQTlot PET modules offer mature processes, high yield and short lead times — turning “stable supply” into the anchor of any sourcing decision.
PET scenario: power banks, garden lights, e-price tags and sensors ship in high volume with tight margins; PET modules deliver 3-5 years of outdoor life at the lowest cost — the mainstream choice for mass-production projects.
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) PET panels support 0.5-40W, any size/shape/voltage customization, free sizing sheet and sample testing.
💡 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: PET Flexible Solar Panels
