Huawei Smart Dongle-WLAN-FE (SDongleA-05) — Wi-Fi and Ethernet Link to FusionSolar

The Huawei Smart Dongle-WLAN-FE, model code SDongleA-05, is the smallest component in a solar installation and the one that decides whether you ever see your own production data. It plugs into the inverter's USB port and pushes operating data to the FusionSolar platform over Wi-Fi or a wired LAN, so daily output and fault alerts appear on your phone. On every system Pearl Solar Energy designs we treat monitoring as part of the installation rather than an optional extra. See the equipment we build systems from, what is included under services, or contact us about an existing array.

What is the SDongleA-05, and how does it differ from the 4G Smart Dongle?

The SDongleA-05 is a compact communications module that plugs into the USB port on a Huawei inverter and connects the system to the FusionSolar monitoring platform. It generates no power and converts nothing; what it does is turn an investment you cannot see into one you can verify. The headline numbers are that it supports up to 10 devices in total and up to 10 inverters, so a site with several inverters does not need a dongle on each one. The clearest difference from the 4G Smart Dongle is how it reaches the internet: this unit uses Wi-Fi to 802.11 b/g/n at 2.412–2.484 GHz, or a 10/100M Ethernet port, which means the site must already have building internet. Remote land or an early-stage site with no connection needs the 4G version instead. The detail installers most often miss is that the listed frequency range is the 2.4 GHz band only. Modern villas running mesh routers usually combine the 2.4 GHz and 5 GHz networks under a single name, and the dongle then fails to find a network it can join. The fix is either to publish a separate 2.4 GHz network name, or simply run a LAN cable, which is more stable anyway. One more check before ordering: the publicly available datasheet is Version 03 from 2019, listing operation mode as STA and naming only the M0 inverter family as supported masters, while Huawei's current web specification page states AP plus STA. Because those two sources disagree, we verify compatibility against the actual inverter model and firmware on site before any order is placed. See our full services or contact us to have your inverter model checked.

Highlights from the datasheet

• One unit covers up to 10 inverters: it supports up to 10 devices in total, so multi-inverter sites consolidate onto a single communications point instead of one per machine.
• Wireless or wired in the same device: Wi-Fi 802.11 b/g/n or a 10/100M Ethernet port, so a site with unreliable wireless coverage can switch to cable without changing hardware.
• 2.412–2.484 GHz only: worth knowing before installation day, because mesh routers that merge the 2.4 GHz and 5 GHz networks under one name routinely prevent the dongle from connecting. A dedicated 2.4 GHz network name solves it.
• Plug-and-play through USB: with a status LED on the body, so an installer can confirm the link is alive at the inverter without opening an app.
• IP65 with a wide temperature range: -30°C to +65°C operating, -40°C to +70°C storage and 5%–95% relative humidity, which suits a unit living permanently on an outdoor-mounted inverter.
• Draws only 2.5 W typical: a small figure that matters because this device runs continuously, every hour of every year.
• Encryption worth asking about: WPA/WPA2 security mechanisms with TKIP/CCMP/AES encryption, and SRRC, CE and RCM certification listed on the datasheet.

Key specifications (SDongleA-05 (Smart Dongle-WLAN-FE))

Note: every figure above comes straight from the Huawei Technologies Co., Ltd. datasheet. Actual system design (strings per MPPT, cable sizing, breakers) must be calculated for each site.

Why this model suits Phuket

• Many villa owners are not on the island year-round: a large share of Phuket properties are owned from overseas, and FusionSolar reporting means system status and fault alerts reach the owner wherever they are.
• Hotel and estate managers watch several buildings at once: with support for up to 10 inverters per dongle, a multi-building site consolidates into one monitoring view.
• Hot and humid conditions almost all year: the IP65 rating and -30°C to +65°C operating range let it stay permanently attached to a wall-mounted inverter outdoors.
• Not every site has fixed internet yet: some plots outside town still have no wired connection. Those need the 4G Smart Dongle instead, since this model communicates only over Wi-Fi or LAN.

Who it suits

• Homeowners and villa owners with existing Wi-Fi or LAN: the most direct way to get daily generation figures and fault alerts into the FusionSolar app.
• Facility, hotel and resort managers: monitoring several inverters on one screen, with a single dongle supporting up to 10 of them.
• Overseas owners: who want to know the moment production stops rather than discovering it on the next electricity bill.
• Sites that need a stable link: the 10/100M Ethernet port lets you cable through thick walls or long runs where wireless is marginal.
• Not suitable for: sites with no building internet connection, which should use the 4G Smart Dongle instead.

Summary

The Huawei Smart Dongle-WLAN-FE (SDongleA-05) costs a tiny fraction of a system budget and is what makes that system verifiable. It supports up to 10 inverters, connects over Wi-Fi 802.11 b/g/n or a 10/100M Ethernet port, is rated IP65, draws 2.5 W typical, and carries 24 months of warranty per the 2021 APAC warranty document. Two things to confirm before ordering: the site must have internet, and the inverter model and firmware must be supported — the publicly available datasheet dates from 2019 and does not fully agree with Huawei's current web specification. To have us verify your inverter and set monitoring up properly, review our services or contact the team.

See other models from this brand on the Huawei overview, or browse all the equipment we install.

Download the datasheet (PDF) — full manufacturer specification sheet