Which solar technology will dominate the future?
The new HPBC technology. Maximum efficiency & design.
HPBC (Hybrid Passivated Back Contact)
This technology stands for top performance, modern design and exceptional durability. A clear improvement over conventional modules.
Are you tired of watching your solar production drop when your panels are shaded? HPBC technology delivers 10-15% more energy in partial shading by moving all electrical contacts to the back of the cell, creating multiple paths for current flow.
HEPA Solar relies on the latest generation of solar panels.
The advantages at a glance:
- Back-contact technology : All conductive traces are located on the back – the entire front surface captures sunlight. Result: highest efficiency and maximum power output .
- Elegant full-black design : Without visible metal contacts, the modules appear elegant, deep black and perfect for demanding architectural projects .
- Peak efficiency up to 25.3% : Thanks to optimized power-temperature coefficient and high open-circuit voltage, the modules achieve above-average yields.
- More power in hot weather : With a low temperature coefficient of only -0.26%/°C Pmax, the modules deliver noticeably more energy, especially in summer.
- Longevity through innovative cell contacting : No solder joints on the front, fewer microcracks, less degradation – higher yield over decades .
- High low-light performance : Even in cloudy conditions, during the morning and evening hours, the modules reliably produce electricity – maximizing the use of every hour of sunshine.
- Future-proof : HPBC is a best-in-class technology that is already setting tomorrow's standards today.
The shadow problem : The weakness of conventional solar panels
Standard solar panels are connected in series, similar to Christmas lights where a broken bulb affects the entire string. If a leaf or branch shades just 51 TP3T of your panel, you can lose 15–251 TP3T of your output.
Solar panels function in the shade, but their output decreases. Generally speaking, solar panels produce about half as much energy under clouds and in the shade as under direct sunlight.
This weakness exists because conventional modules only have a single electrical path. If shadows block part of this path, resistance is created that affects the entire module.
Current flow in conventional modules (left) compared to HPBC modules (right) under partial shading.
The new HPBC technology combines aesthetic perfection with top technical performance.
HEPA panels are the best choice for anyone who doesn't compromise on their energy supply.
Alternative power paths
This architecture creates multiple parallel power paths. If an area is shaded, the power can still flow efficiently via alternative routes, much like traffic bypasses a road closure.
HPBC cell structure with all contacts on the back, so that the front remains completely open for absorption of sunlight.
Performance comparison: HPBC vs. TOPCon vs. PERC
Comparison of key performance indicators of solar module cell technologies (cell efficiency, module efficiency, temperature coefficient, bifaciality, shading behavior, aesthetics and market maturity).
| Special feature | HPBC | TOPCon | PERC |
|---|---|---|---|
| Cell efficiency | 24.3–26.6% | 24.5–25.5% | 22.0–23.5% |
| Module efficiency | 22.8–24.8% | 22.5–23.1% | 20.0–21.5% |
| Shadow output | Supervisor | Good | standard |
| temperature coefficient | -0.26% to -0.28%/°C | -0.30% to -0.33%/°C | -0.35% to -0.40%/°C |
| Bifacial ratio | 30–50% | 70–80% | 60–70% |
| aesthetics | Premium (no grid lines) | standard | standard |
| Market readiness | New (since 2022) | Founded | Tires |
| Current market share (N-type) | 10–15% | 55–60% | N/A (P-type) |
Technical features
HPBC: Combines TOPCon and IBC (Interdigitated Back Contact) technologies to create a cell without metal contacts on the front, thus maximizing light absorption.
Longi has been developing HPBC cells since 2018. Standard versions achieve a remarkable mass production efficiency of 25%. Through internal structural improvements, the technology significantly enhances light absorption and photoelectric conversion capability.
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