Solar panel 400 W: when we install it, and when we take 500
Customers order a 400-440 W panel for a small roof: townhouse, garage, veranda, balcony PV. The 108 half-cell format is roughly 1.13 × 1.72 m, weighing 21-23 kg (5-7 kg lighter than 500 W, which matters on soft roofing or old rafters). A typical customer this year: an apartment owner with a 4-6 m² balcony putting in 2-4 panels of 410 W with a microinverter to offset peak-tariff loads. Or a dacha with a 1.5-2.5 kW system for a well pump.
Technically this is monocrystalline PERC at 20-21% efficiency (lower than 500 W due to the smaller format). Working voltage Vmpp around 31-32 V, Voc 37-38 V. This matters: a string of 12 panels gives Voc ~456 V, already close to the 500 V ceiling on entry-level MPPTs. Our warehouse stocks Veichi VCS-108H series. We pick this series because it has half-cell and 3 bypass diodes, so partial shading does not kill the whole string.
We ask up front: why 400 W instead of 500
Three typical cases where 400 W is the right call. First: roof of 15-25 m², where 500 W does not give a clean panel count for the inverter. Second: weight. Old soft roofing or light rafters with a 22-25 kg/m² limit make 500 W marginal, 400 W comfortable. Third: balcony or veranda with size and wind-load limits (smaller panel, less wind sail).
What we check before ordering. First: is there space for the mandatory 30 cm offset from the roof edge (installer's wind-load rule). Second: mount type – metal tile uses short L-brackets, standing seam uses non-piercing clamps. Third: do you need DC pre-wiring now for a future inverter. Warranty: 12 years on materials, 25 years linear performance (84.8% after 25 years, per datasheet). We ship from Kyiv in 1-3 days. If you are torn between 400 and 500, ask us: we size your roof in 5 minutes.
| Model | Power | Efficiency | Type | Application |
|---|---|---|---|---|
| VCS-108H-400-P | 400 W | 20.48% | Monofacial | Residential PV, limited roof area |
| VCS-108H-410-P | 410 W | 20.99% | Monofacial | Home power station 3-5 kW |
| VCS-108H-415-D | 415 W | 21.25% | Bifacial | Ground mount, tracker systems |
| VCS-108H-425-D | 425 W | 21.76% | Bifacial | Commercial generation, carports |
| VCS-108H-430-D | 430 W | 22.02% | Bifacial | Maximum 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
- 500W Solar Panel: for medium-power home systems
- 600W Solar Panel: for commercial and industrial installations
- Solar Panels for Home: matched to residential needs
- Batteries for Solar Panels: energy storage solutions
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.
