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400W Solar Panel

400W Solar Panel — compact monocrystalline modules for residential solar systems

400 W solar panels are the optimal choice for residential solar power stations where roof space is limited. Veichi VCS series modules are built on 108 half-cells of monocrystalline silicon using PERC+ technology, delivering efficiency from 20.48% to 22.02%. Compact dimensions (approximately 1755×1038 mm) allow installation on small roofs, canopies, and even balcony structures. The catalogue features 10 models from 400 to 430 W — both monofacial and bifacial variants. For higher power, consider 500W solar panels or 600W modules.

How to choose a 400W solar panel

When selecting a 400 W panel, consider the module type (monofacial or bifacial), efficiency, operating voltage, and current. Bifacial panels generate an additional 10-25% energy from reflected light, which is advantageous when mounted on trackers or above light-coloured surfaces. A home solar system of 3-4 kW requires 8-10 panels at 400 W.

ModelPowerEfficiencyTypeApplication
VCS-108H-400-P400 W20.48%MonofacialResidential PV, limited roof area
VCS-108H-410-P410 W20.99%MonofacialHome power station 3-5 kW
VCS-108H-415-D415 W21.25%BifacialGround mount, tracker systems
VCS-108H-425-D425 W21.76%BifacialCommercial generation, carports
VCS-108H-430-D430 W22.02%BifacialMaximum efficiency per m²

400W solar panel manufacturers

Veichi is an industrial equipment manufacturer specialising in VFDs, hybrid inverters, and solar panels. The VCS series with 108 half-cells covers the 390-430 W range. Veichi panels are certified to IEC 61215 and IEC 61730 standards, feature anti-reflective coating, and offer enhanced PID degradation resistance. The operating voltage of 31-32 V allows forming strings of 8-12 panels for most hybrid inverters.

Solar panels by specifications

Warranty and support

All 400 W solar panels come with an official warranty: 12 years on materials and workmanship, 25 years on linear performance (at least 84.8% of rated power after 25 years). Our engineers will help calculate the number of panels and select a suitable hybrid inverter and batteries for your project. Payment by bank transfer for legal entities or by card. Delivery across Ukraine.

Frequently Asked Questions

How does a 400 W panel differ from a 500 W?

A 400 W panel is more compact (approximately 1755×1038 mm vs 2280×1134 mm) and 4-5 kg lighter. It suits roofs with limited space or complex geometry. Silicon cell efficiency is the same (20-22%); the difference is cell count — 108 vs 144. Cost per watt is virtually identical.

How many 400 W panels are needed for a house?

For an average home consuming 10-15 kWh/day, 8-10 panels of 400 W are needed (3.2-4 kW array). For full autonomy — 15-20 panels (6-8 kW). An array of 10 panels occupies approximately 18 m² of roof space.

What is a bifacial solar panel?

A bifacial panel generates electricity from both sides: the front absorbs direct sunlight, while the rear captures light reflected from the surface below. Additional yield is 10-25% depending on surface albedo. Most effective above white roofs, concrete, or sand.

Are 400 W panels suitable for a balcony?

Yes, 400 W panels are optimal for a balcony micro-station. Dimensions of 1755×1038 mm allow mounting on balcony railings. One or two panels (400-800 W) with a micro-inverter are sufficient to partially cover household consumption.

Which hybrid inverter works with 400 W panels?

For an array of 8-10 panels (3.2-4 kW), a 3-5 kW hybrid inverter with an MPPT input is suitable. The panels' operating voltage of 31-32 V allows connecting 8-12 units in a string. Ensure the inverter's MPPT range covers the total string voltage.

What is the warranty on 400 W solar panels?

Standard warranty: 12 years on materials and workmanship, 25 years on linear performance. After 25 years, the panel must retain at least 84.8% of rated power (no less than 339 W). Actual service life is 30+ years with minimal maintenance.