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Problem diagnosis · Huawei

Huawei WiFi Not Connecting — Smart Dongle & Smart Logger Setup Guide

Can't connect your phone to the Huawei dongle or logger for commissioning? Or the device won't stay connected to your home WiFi? This guide covers both the Smart Dongle (residential) and Smart Logger 3000A (commercial), including how to find the device network, reset WiFi, and configure router settings.
  • Smart Dongle WLAN-FE (residential)
  • Smart Logger 3000A (commercial)
  • FusionSolar app walkthrough
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WiFi won't pair, device not appearing in FusionSolar, or RS485 chain broken on a multi-inverter system? We configure Huawei connectivity remotely.

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5.0
13 Trustpilot reviews
Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

⚡ Safety Warning

Do not open your inverter or interfere with DC cabling. Solar panels produce live DC voltage whenever exposed to light. Always use your DC isolator switch and contact a qualified solar engineer for hands-on fault diagnosis.

ℹ️

Two different devices, two different processes. Most residential Huawei systems use a Smart Dongle plugged into the inverter. Commercial systems with multiple inverters use a Smart Logger 3000A connected via RS485 cable. Start at step 1 to identify which you have — the connection process differs between them.

Diagnostics

6-step WiFi connection guide

Start by identifying your device (step 1), then connect your phone to it (steps 2–3). Once connected, configure the router link (steps 4–5). Step 6 covers RS485 issues on multi-inverter Smart Logger systems.

1

Identify whether you have a Smart Dongle or a Smart Logger

Huawei systems use two different connectivity devices. The connection process differs between them:

Smart Dongle (SDongleA-05)

A small module plugged into the USB port on the bottom of a single SUN2000 inverter. Used on most residential systems. Has WiFi and Ethernet. Default installer password: 00000a.

Smart Logger 3000A

A separate wall-mounted box used on commercial systems with multiple inverters. Connected via RS485 daisy chain. WiFi hotspot: Logger_[SN]. Default password: Changeme.

If you are unsure, check the bottom of the inverter. A Smart Dongle is a small device about the size of a USB flash drive plugged directly into the inverter.

2

Connect your phone to the device's local WiFi network

Both devices broadcast their own local WiFi network for configuration. You need to be within a few metres of the device.

Smart Dongle: Open the FusionSolar app → tap MeDevice commissioning → scan the QR code on the right side of the inverter. Your phone connects to the dongle's WiFi automatically.
Smart Logger: Open your phone's WiFi settings and look for a network named Logger_ followed by the serial number from the device label. Connect using the default password Changeme. Then open the FusionSolar app.

Temporarily disable auto-join on your home WiFi — phones often reconnect to the stronger home network instead of staying on the weaker device network.

3

If the device WiFi network is not visible — reset it

If you cannot see the device's WiFi network in your phone's WiFi list:

Smart Dongle: The WiFi is always available when the inverter is powered on. If not visible, power cycle the inverter — AC off, DC off, wait 60 seconds, DC on, AC on. Wait 2 minutes for the dongle to boot.
Smart Logger: The WiFi hotspot is only available for 4 hours after power-on. If more than 4 hours have passed, press and hold the RST button for 1–3 seconds to re-enable WiFi. Do not hold longer than 5 seconds — this triggers a factory reset.

If the Smart Dongle WiFi still does not appear after a power cycle, the dongle may be faulty or not properly seated in the USB port. Remove and reseat it firmly.

4

Log in via FusionSolar and check communication settings

Once connected to the device WiFi, open the FusionSolar app:

Smart Dongle: Select Installer → log in with password 00000a → navigate to Settings → Communication configuration. The dongle automatically communicates with the inverter via the USB connection.
Smart Logger: Select Installer → log in with password Changeme → check the device list to confirm all connected inverters are detected via RS485.

If the login password has been changed by your installer, you will need their credentials. The default passwords only work if they have not been modified.

If the FusionSolar app cannot find the device after connecting to its WiFi, try force-closing and reopening the app. On some Android phones, you may need to disable mobile data temporarily to prevent the phone routing traffic through 4G instead of the local WiFi.

5

Configure the router WiFi connection

In Communication configuration, go to Router connection settings. Select your home or site WiFi network and enter the password:

Smart Dongle: Only supports 2.4GHz WiFi (802.11b/g/n). If your network does not appear, it may be broadcasting on 5GHz only. Create a dedicated 2.4GHz SSID or disable band steering on your router.
Smart Logger: Some models support both 2.4GHz and 5GHz. Check the device specifications. If the network does not appear, move the Smart Logger closer to the router or use the Ethernet port instead.
Both devices: After entering the WiFi password, tap Connect. Then go to Management system settings, enable authorisation and TLS, and tap Connect to establish the link to FusionSolar cloud.

If the device connects to WiFi but FusionSolar still shows no data after 10 minutes, check that management system settings are correctly enabled — this is the step that links the device to the FusionSolar cloud platform.

6

For Smart Logger systems — check the RS485 daisy chain

If you are using a Smart Logger 3000A with multiple SUN2000 inverters connected via RS485, communication issues between the logger and inverters are a separate problem from WiFi:

Unique addresses: Each inverter must have a unique RS485 address (1–247). Duplicate addresses cause communication conflicts.
Daisy chain wiring: RS485 must be wired in a daisy chain — logger to inverter 1, inverter 1 to inverter 2, and so on. Star wiring does not work reliably.
Baud rate: All devices must use the same baud rate — default is 9600.
Termination: The last device in the chain should have a termination resistor (120Ω) to prevent signal reflections. Long cable runs over 100m need shielded twisted pair cable.
Cable connections: Check all RS485 terminal blocks for loose wires. A single broken connection in the chain disconnects every inverter after that point.

In FusionSolar, check the device list — any inverter not appearing has a communication break somewhere between it and the Smart Logger.

Smart Dongle vs Smart Logger — which do I need?

The Smart Dongle (SDongleA-05 WLAN-FE) is the standard connectivity solution for residential Huawei installations with a single SUN2000 inverter. It plugs into the inverter's USB port and provides both WiFi and Ethernet (RJ45) connectivity to FusionSolar. It supports connection to up to 10 daisy-chained devices via RS485 if needed, but in practice most residential systems use it for a single inverter. The dongle is small, self-powered from the inverter, and requires no separate installation.

The Smart Logger 3000A is designed for commercial and large residential systems with multiple SUN2000 inverters. It is a separate DIN-rail or wall-mounted device that connects to inverters via RS485 cable and provides centralised monitoring through a single internet connection — either WiFi or Ethernet. The Smart Logger supports up to 80 connected devices and provides features like local data storage, alarm management, and centralised firmware updates that are not available on the Smart Dongle.

Most WiFi connectivity issues on residential systems trace back to the Smart Dongle losing its WiFi connection after a router change — see our dedicated FusionSolar offline guide for a full walkthrough of that specific scenario. The guide above covers the broader range of connection issues including initial setup, phone-to-device WiFi pairing, and Smart Logger RS485 communication.

FAQ

WiFi & Smart Logger — common questions

The most common causes are being too far from the inverter (you need to be within a few metres), the inverter being powered off (the dongle only broadcasts when the inverter has power), or your phone auto-reconnecting to your home WiFi instead of staying on the dongle network. Disable auto-join on your home WiFi temporarily, move close to the inverter, and try again. If still not visible, power cycle the inverter.
The Smart Dongle plugs into a single inverter's USB port and provides WiFi and Ethernet connectivity — used on most residential systems. The Smart Logger 3000A is a separate wall-mounted device for commercial systems with multiple inverters, connected via RS485 daisy chain. Both connect to FusionSolar cloud but the Smart Logger supports up to 80 devices with centralised management.
The Smart Logger WiFi hotspot is only active for 4 hours after power-on. To re-enable it, press and hold the RST button for 1–3 seconds. The hotspot name is Logger_ followed by the serial number, and the default password is Changeme. Do not hold the RST button longer than 5 seconds — this triggers a factory reset. If you need a full factory reset, hold for 10 seconds or more.
Yes, but it is unnecessary for most residential installations. A single SUN2000 inverter only needs a Smart Dongle for connectivity. The Smart Logger is designed for commercial systems with multiple inverters and provides RS485 daisy chaining, centralised device management, and advanced monitoring features. For a single inverter, the Smart Dongle is simpler and more cost-effective.
Persistent communication drops via RS485 are usually caused by loose cable terminations, duplicate RS485 addresses (each inverter must be unique), electromagnetic interference on long cable runs, or a missing termination resistor at the end of the chain. Check all connections, verify unique addressing, ensure the baud rate is 9600 on all devices, and use shielded twisted pair cable for runs over 100 metres.
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WiFi or Smart Logger still not connecting?

Device WiFi not appearing, FusionSolar login failing, RS485 chain broken, or Smart Logger not detecting inverters? We configure Huawei connectivity remotely — Smart Dongle, Smart Logger, and multi-inverter RS485 systems.

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