Huawei FusionSolar’s Leading Safety Technologies for Residential PV

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Huawei FusionSolar’s Leading Safety Technologies for Residential PV

Iris Hellas
Δημοσιεύθηκε από PV Magazine σε Φωτοβολταικά - Διεθνή · Τετάρτη 12 Απρ 2023
Tags: SafetyTechnologiesforResidentialPV
Analysis of previous residential PV fire accidents reveals that, regardless of the causes, DC high voltage is a direct threat, whether in construction, operation and maintenance, or even rescue efforts. In 2019, a house in Schwerinsdorf, Germany caught fire. Although more than 70 firefighters from six fire departments arrived at the scene, due to the high voltage on the roof, they had to let the house burn in a controlled manner until the solar panels were completely burnt out.

User concerns are our priority. Let's look at how Huawei FusionSolar residential PV delivers superior quality and supports firefighting safety.

Huawei FusionSolar has upgraded its optimizer to allow a rapid voltage shutdown for the safety of firefighters and maintenance personnel.

Even if the inverter is shut down, PV modules keep generating electricity as long as there is sunshine. To tackle this safety issue, Huawei FusionSolar optimizers are equipped with a module rapid shutdown function. Every module is connected to an optimizer to monitor its output. In the event of a fire, the PV rapid shutdown function can be automatically triggered by the disconnection of the inverter from the grid, interruption of communication with the remote emergency switch, or manually actuated by turning off the DC switches. As a result, firefighting measures can be taken immediately to minimize losses.

Huawei FusionSolar's safety shutdown function has been verified in a rooftop PV project on a commercial building. Two triggers were used: disconnecting the DC switch and disconnecting the AC switch. The MPPT voltage at the input of the inverter dropped to 0 V, and the shutdown time was 25s and 11s respectively, which met the requirements of the NEC 2020 690.12 standard. The safety shutdown function provides the highest level of personal safety in the industry for homeowners, installation and maintenance personnel, and firefighters.
Automatic cut-off within 0.5s in case of a fire

In a typical small distributed PV system structure, electrical fires are mainly caused by DC arc. It is necessary to take comprehensive measures such as rapid shutdown technology and intelligent arc fault detection to improve the safety of distributed PV.

Huawei FusionSolar launched the Smart Energy Controller (inverter) many years ago. Unlike conventional inverters, which are unable to accurately detect and extinguish the arc, Huawei's FusionSolar Smart Energy Controller have the following advantages:
  • Through accurate and wide-range detection, Huawei's FusionSolar inverters can achieve 0.5s automatic shutdown.
  • The DC voltage on the roof can be automatically and quickly shut down to a safe level in case of a fire to protect the safety of firefighters, maintenance personnel, and properties.
  • The EMC compliance of inverters ensures immunity to electromagnetic interference.
  • The reliable design, production, and tests guarantee 25 years of service life with an annual failure rate < 0.5%. “Huawei FusionSolar inverters are very reliable, nearly maintenance-free. If there is a fire, I'm confident that the firefighters can put it out safely.” said an installer.
  • Modular+ safety and 4-layer protection certified to Germany's VDE AR-E 2510-50

VDE AR-E 2510-50 is regarded as the strictest safety standard in the residential storage industry. Huawei's FusionSolar LUNA2000 Smart String ESS has passed the certification.

This is because Huawei's FusionSolar battery cells are provided by leading battery suppliers, and the battery, LiFePO4 (LFP), is the most stable. Moreover, each battery has 16 LFP cells and 8 sensors, meaning that each sensor monitors only 2 cells. In addition, the voltage on battery ports is 0 V, and the internal electrical components are isolated, posing no risks to users. Last but not the least, each battery pack has a built-in fire suppression kit that meets the fire protection certification of many countries.
Nothing is more important than safety. Only when users have confidence in its safety will the residential PV industry develop at a faster pace and more sustainably to noticeably contribute to a greener planet.

Iris Hellas,  Δωδεκανήσου 40, 567 28, Θεσσαλονίκη. Τηλ.:+30 2310 809414  email: [email protected]
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