# COTECH Solar (cotechsolar.com)

> Vertically integrated solar manufacturer founded in Shanghai in 2005 (subsidiary of COTECH SOLAR GROUP LIMITED, Hong Kong).
> 20 GW of PV modules shipped to 120+ countries and ~800 clients. Top-50 global PV module supplier.
> Offices: Shanghai (HQ), Hong Kong, Rotterdam (Europe).

## Products
- Solar Modules: On-grid, off-grid, flexible and portable solar panels (PV modules) — TOPCon, HJT and back-contact, up to 730 W. → https://cotechsolar.com/products/solar-modules/
- Energy Storage: LiFePO4 storage from 300 W balcony kits to 5 MWh liquid-cooled containers. → https://cotechsolar.com/products/energy-storage/
- Mounting System: Roof, ground, carport, balcony, tracker and floating structures rated to 60 m/s. → https://cotechsolar.com/products/mounting-system/
- Mobile Solar Power: Solar light towers, surveillance trailers, generator trailers and portable stations. → https://cotechsolar.com/products/mobile-power/
- Cleaning Robots: Full-auto, semi-auto and trackless robots — dry cleaning that lifts yield 6-20%. → https://cotechsolar.com/products/cleaning-robot/
- Solar Water Pumps: Brushless pumps for wells, irrigation, pools and livestock — MPPT, dry-run protected. → https://cotechsolar.com/products/water-pump/
- Solar Lighting: Street, wall, garden lights and home kits — LiFePO4, 180 lm/W, PIR smart control. → https://cotechsolar.com/products/solar-light/
- Solar Ventilation: Nine ventilation lines — roof, wall, industrial, ceiling, ducted, tent fans and skylights. → https://cotechsolar.com/products/solar-fan/

## Key facts
- Founded: 2005 · 2 production bases · 4 branches · annual module capacity >1.2 GW
- Module platforms: N-type TOPCon (NeoPro), HJT (HyperX), back-contact (NeoBlack); up to 730 W / 23.2% efficiency
- Module warranty: 15-year product, 30-year linear power (dual-glass)
- Storage: LiFePO4 from balcony kits to 5 MWh liquid-cooled 20-ft containers
- Certifications: ISO 9001, ISO 14001; product marks incl. TÜV, UL, IEC, VDE, CE

## Buying guides (vendor-neutral, English)
- Solar Module Degradation & Warranties Explained: How to read a PV module warranty — product versus performance cover, what a 30-year linear curve guarantees, what causes degradation, and the exclusions that decide a claim. → https://cotechsolar.com/guides/solar-module-degradation-and-warranties/
- PV String Sizing & 1500 V System Voltage Design: How to size PV strings — temperature-corrected Voc for the cold-morning voltage limit, the hot-day MPPT check, current and fuse limits, with worked examples. → https://cotechsolar.com/guides/pv-string-sizing-and-system-voltage/
- How to Read a Container BESS Datasheet & Warranty: A buyer's guide to container battery specs — rated versus usable energy, C-rate and PCS pairing, round-trip efficiency, cycle-life definitions and warranty terms. → https://cotechsolar.com/guides/how-to-read-a-container-bess-datasheet/
- TOPCon vs HJT vs Back-Contact — Which N-Type Solar Module Technology?: A vendor-neutral comparison of the three mainstream N-type module technologies — TOPCon, heterojunction (HJT) and back-contact — covering efficiency, temperature behaviour, bifaciality, cost and where each fits best. → https://cotechsolar.com/guides/topcon-vs-hjt-vs-back-contact/
- Solar Water Pump vs Diesel Pump — Which Costs Less?: Diesel pumps are cheaper to buy but cost fuel and maintenance every year; solar pumps cost more upfront but run on free sunlight. This guide compares the two on total cost, reliability and where each fits. → https://cotechsolar.com/guides/solar-water-pump-vs-diesel/
- Solar Pump Types Explained — Submersible, Surface, Pool and AC/DC Hybrid: A guide to the main solar water pump types — deep-well submersible, surface, pool and AC/DC hybrid — with what each is for and how to pick the right one for wells, irrigation, pools or livestock. → https://cotechsolar.com/guides/solar-pump-types-explained/
- Solar Mounting Systems Compared — Roof, Ground, Carport, Tracker and Floating: An overview of the main solar mounting types — pitched and flat roof, ground-mount, carport, single-axis tracker and floating — with where each fits, and the load and material factors that decide a durable structure. → https://cotechsolar.com/guides/solar-mounting-systems-compared/
- Solar Light Towers vs Diesel — Off-Grid Site Lighting Compared: Solar light towers light up construction sites, events and remote areas with no fuel and no noise. This guide compares them with diesel light towers on cost, reliability and where each fits. → https://cotechsolar.com/guides/solar-light-towers-vs-diesel/
- Solar Attic and Roof Fans Explained — Do They Work?: Solar attic and roof fans exhaust hot air using free sunlight, easing cooling loads and moisture. This guide explains how they work, what they achieve, and where they help most. → https://cotechsolar.com/guides/solar-attic-roof-fans-explained/
- Sizing Solar Ventilation — Airflow (CFM / m³h) for Your Space: A step-by-step guide to sizing solar ventilation — how to work out the airflow (in m³/h or CFM) your attic, greenhouse or workshop needs, and match it to the right fan. → https://cotechsolar.com/guides/sizing-solar-ventilation-airflow/
- N-Type vs P-Type (PERC) Solar Modules — What Changed and Why It Matters: N-type modules have replaced p-type PERC as the industry mainstream. This guide explains the practical differences in efficiency, degradation and temperature behaviour, and what they mean for a project's energy yield. → https://cotechsolar.com/guides/n-type-vs-p-type-perc-modules/
- LiFePO4 vs Lead-Acid Batteries for Solar — Which Should You Choose?: A practical comparison of lithium iron phosphate (LiFePO4) and lead-acid batteries for solar storage — covering cycle life, usable capacity, efficiency, maintenance and total cost of ownership. → https://cotechsolar.com/guides/lifepo4-vs-lead-acid-solar-batteries/
- How to Size a Solar Water Pump — Head, Flow and Well Depth: A step-by-step guide to sizing a solar water pump for wells, irrigation and livestock — how to work out total head and required flow, and match them to the right pump and panel array. → https://cotechsolar.com/guides/how-to-size-a-solar-water-pump/
- How to Size a Home Solar Battery — A Simple Step-by-Step Guide: A step-by-step guide to sizing a home battery for solar self-consumption and backup — how to work from your evening energy use and backup needs to a battery capacity, and what else to check. → https://cotechsolar.com/guides/how-to-size-a-home-solar-battery/
- How to Choose a Solar Street Light — Lumens, LiFePO4 and PIR: A buying guide to solar street lights — how to match brightness (lumens), battery capacity, LED efficacy and smart controls to the road, compound or area you need to light. → https://cotechsolar.com/guides/how-to-choose-solar-street-light/
- How to Choose a Solar Mounting System — Wind, Snow and Roof Type: A step-by-step guide to specifying a solar mounting system — reading your roof or ground conditions, matching wind and snow loads, choosing materials and getting a structural calculation. → https://cotechsolar.com/guides/how-to-choose-solar-mounting/
- How to Choose Solar Modules for Rooftop, Utility and Off-Grid Projects: A practical buying guide to selecting the right solar module for residential rooftops, commercial and utility plants, and off-grid systems — covering power class, cell technology, format and warranty. → https://cotechsolar.com/guides/how-to-choose-solar-modules/
- How to Choose a Portable Power Station for Off-Grid and Backup: A buying guide to portable power stations — how to match output power, battery capacity, solar input and battery chemistry to your devices, sites and backup needs. → https://cotechsolar.com/guides/how-to-choose-portable-power-station/
- Full-Auto vs Semi-Auto vs Trackless Solar Cleaning Robots: Solar cleaning robots come in three main types — full-auto array-resident, semi-auto remote-controlled, and RTK trackless. This guide explains how each works and which suits your plant. → https://cotechsolar.com/guides/full-auto-vs-semi-auto-cleaning-robots/
- Floating Solar (FPV) Explained — When Water-Surface PV Makes Sense: Floating photovoltaics put solar on reservoirs and ponds, saving land and cooling the modules. This guide explains how FPV works, its benefits and challenges, and where it is the right choice. → https://cotechsolar.com/guides/floating-solar-fpv-explained/
- Fixed-Tilt vs Single-Axis Trackers — Which for Your Ground-Mount?: Single-axis trackers follow the sun to raise energy yield, but add cost and moving parts. This guide compares fixed-tilt and tracker ground mounts and explains when the extra yield justifies the tracker. → https://cotechsolar.com/guides/fixed-tilt-vs-single-axis-trackers/
- Do Solar Panel Cleaning Robots Pay Off? Yield, Water and Labour: Dust and soiling cut solar output; cleaning robots restore it automatically. This guide explains where cleaning robots pay off — through recovered yield, saved water and safer, cheaper O&M. → https://cotechsolar.com/guides/do-solar-cleaning-robots-pay-off/
- Choosing Commercial and Utility Storage — From Home Systems to 5 MWh Containers: A guide to specifying battery storage for commercial, industrial and utility projects — the value drivers, how to size power vs energy, and what safety and integration features to demand. → https://cotechsolar.com/guides/commercial-utility-storage-sizing/
- Brushless Motors, MPPT and Dry-Run Protection in Solar Pumps: Three features separate a good solar pump from a cheap one — a brushless permanent-magnet motor, built-in MPPT, and dry-run protection. This guide explains what each does and why it matters. → https://cotechsolar.com/guides/brushless-mppt-dry-run-solar-pumps/
- Bifacial Solar Modules Explained — When the Extra Yield Pays Off: Bifacial modules generate power from both sides, adding energy yield in the right conditions. This guide explains how bifacial gain works, where it pays off, and what to check before specifying bifacial modules. → https://cotechsolar.com/guides/bifacial-solar-modules-explained/
- Balcony Solar and Plug-In Storage Explained: Balcony solar kits let apartment residents generate their own power without a rooftop. This guide explains how plug-in solar and storage work, who they suit, and what to check before buying. → https://cotechsolar.com/guides/balcony-solar-plug-in-storage-explained/
- All-in-One vs Split Solar Street Lights — Which to Choose?: Solar street lights come as all-in-one units or split systems with a separate panel and battery. This guide compares the two on installation, performance, cold-climate use and cost. → https://cotechsolar.com/guides/all-in-one-vs-split-solar-street-lights/

## Documentation
- Datasheets (26 PDFs): https://cotechsolar.com/downloads/
- Contact: info@cotechsolar.com · +86-17717537975 (WhatsApp) · https://cotechsolar.com/contact/