WiFi won't pair, or the device isn't appearing in FusionSolar? Follow the free step-by-step guide on this page. If it still won't connect, we set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. An RS485 chain broken on a multi-inverter system isn't the WiFi: our free remote diagnostic finds the cause.
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Saw Ron was advertising a refurbished 9.5 kWh on Facebook, within a couple of days Ron delivered and installed it into my current system, my existing 9.5 batter was also. Gen 2 running on firmware 3022. Literally took him 30 mins, from start to finished, within a couple of days the two batteries had balanced themselves, it’s now been a week with Predbat in control. Working perfectly , could not recommend Ron more highly Top Man!
Wow... a firmware update to my inverter sent the whole system into meltdown – the battery discharged, and the house seemed to be drawing power, and the solar, who knows where that was going? Aghhh... A short email exchange with Roland and Solar Tech Support sorted the problem... the firmware had reversed a setting (from when it was installed), and the CT clamp needed to be reversed. As soon as I had done that, the world returned to normal. Thanks, Roland; there is no way I would have come to that conclusion. Would I recommend them? You bet! Worth the fee? You bet, again!
Unfortunately, only weeks after Givenergy went into receivership, our system failed. Our installers were unhelpful in the extreme but Solar Tech Support were able to diagnose a terminal problem with our Gen 1 AC3 inverter. They advised regarding the available options and (having decided to buy a replacement Givenergy inverter as the simplest solution) they were able to get us up and running. They made themselves readily available to talk through the process and manage any faults. I would have no problem recommending them.
My installer put me through Hell with so botched install that you can not imagine Than Ron came , He did not managed to do miracles (because my system components were impossible to work together) and he Gave me a detailed report of what is wrong , why is wrong , why can not be fixed etc. with all the details which I can use in a claim. Without His his help knowledge and attitude I would've been lost
Ron is a life saver sorted out a connectivity problem and had to replace one of my inverters all good now so I can stop stressing. Thank you again
After 7 months of not being able to access/control my system following a change of wi-fi provider, followed by the news that GivEnergy had ceased trading i was left high and dry. I was unable to get any help whatsoever from my installer, tried various electrical tradespeople etc but no-one knew how to help me. Changed the Dongle but then couldnt get this change recognised in the inverter. Found Solar Tech Support while researching yet again online. Ronald has been amazing. Responding very quickly to my emails and very knowledgeable on the system. Managed to give us the information we needed to get the Dongle up and running and created me another account which now works as it should. His help has been invaluable. Thank you so much. Reviews I saw from other people said Solar Tech Support are very good, but i would say they are Outstanding!! Thanks again for all your help- Mick & Sandra
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.
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.
Huawei systems use two different connectivity devices. The connection process differs between them:
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.
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.
Both devices broadcast their own local WiFi network for configuration. You need to be within a few metres of the device.
Temporarily disable auto-join on your home WiFi — phones often reconnect to the stronger home network instead of staying on the weaker device network.
If you cannot see the device's WiFi network in your phone's WiFi list:
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.
Once connected to the device WiFi, open the FusionSolar app:
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.
In Communication configuration, go to Router connection settings. Select your home or site WiFi network and enter the password:
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. If it still won't report to FusionSolar, we can set it up on site, from £195.
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:
In FusionSolar, check the device list — any inverter not appearing has a communication break somewhere between it and the Smart Logger.
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.
Device WiFi not appearing, or it won't join your router? Follow the free step-by-step guide on this page. If it still won't connect, we set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. If the signal doesn't reach, a WiFi extender is an extra £75, and we carry them with us. FusionSolar login failing, an RS485 chain broken, or a Smart Logger not detecting its inverters? That isn't the WiFi, and our free remote diagnostic finds the cause.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
Every message is read and answered, so please don’t send it twice; that only slows the queue.
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