Does the Milesight SG50 have an Ethernet port?

No. The SG50's listed backhaul is 4G LTE Cat 1/GSM on a nano SIM (4FF), and its 2.4 GHz Wi-Fi is AP mode for device configuration only. The UG67 has 1 x RJ45 10/100/1000 WAN port that also accepts 802.3af PoE power.

How many LoRaWAN devices can the SG50 handle compared with the UG67?

Both are specified at around 2000 Class A/B/C devices - the UG67 at a 10-minute uplink interval, the SG50 depending on uplink/downlink frequencies. The difference is the onboard server: the SG50's embedded network server is LoRaWAN v1.0.3 Class A/C with a stated maximum of 100 devices, so beyond that it forwards packets to an external network server.

How long will the SG50 run without sunlight?

The datasheet quotes up to 4 days without sunlight, measured with 100 nodes on a 10-minute report interval, from its 3.6 V 25000 mAh 18650 backup batteries. Typical power consumption is 0.8 W.

Can the UG67 be run from solar instead?

The UG67's listed power inputs are 802.3af PoE and 6-12 V DC via an M12 A-coded connector; no battery and no solar input appear in its specification, and typical consumption is 3.6 W against the SG50's 0.8 W. Any solar arrangement would be a separate DC system you supply, which is exactly what the SG50 packages.

Which frequency variant do I need in the UK?

EU868 - both units are supplied here as the -868M variant, and both list EU868 within their supported band range (CN470/IN865/EU868/RU864/US915/AU915/KR920/AS923-1&2&3&4).

UG67 vs SG50: Milesight Solar LoRaWAN Gateway UK

Short answer: The Milesight UG67 and SG50 are both IP67 outdoor LoRaWAN gateways with the same headline radio — 8 channels, EU868 for the UK, −140 dBm sensitivity and 27 dBm maximum transmit power. What separates them is power and backhaul. The UG67 is the mains-fed gateway: 802.3af PoE or 6–12 V DC, a gigabit RJ45 WAN port, plus 4G and Wi-Fi. The SG50 is the solar LoRaWAN gateway: solar or 12–24 V DC input, 25000 mAh backup batteries, 0.8 W typical draw and 4G LTE Cat 1 as its only backhaul.

Which one do I need, the UG67 or the SG50?

Choose the UG67 if there is already power at the mounting point, or a cable run you were going to make anyway. One Cat 5e run from an 802.3af switch carries both power and backhaul to the pole, and if the far end has no LAN the same unit falls back to 4G or Wi-Fi. It is also the one to pick when the gateway has to do work on site rather than just relay packets: quad-core CPU, 8 GB eMMC, BACnet/IP, BACnet/SC and Modbus TCP integration, and a long VPN list including WireGuard and IPsec.

Choose the SG50 if the site has no power feed and getting one there is the expensive part of the job — a field, a reservoir compound, a car park light column, a farm building at the end of a track. Solar plus its 3.6 V 25000 mAh 18650 batteries removes the trench entirely, and the datasheet quotes up to 4 days of running without sunlight at 100 nodes on a 10-minute report interval.

The SG50 is not a solar version of the UG67

This is where most specifications get misread. Both list around 2000 Class A/B/C devices, but on the SG50 that is its capacity as a packet forwarder to an external network server. Its own embedded network server is LoRaWAN v1.0.3 Class A/Class C with a stated maximum of 100 devices and MQTT integration. If you were relying on the UG67’s built-in server to run the whole site, the SG50 is not a drop-in swap.

Three further differences follow from the power budget:

The SG50 has no Ethernet port. Backhaul is 4G LTE Cat 1/GSM on a nano SIM (4FF); its 2.4 GHz Wi-Fi is AP mode for device configuration only, not a data path. The UG67’s RJ45 is a 10/100/1000 WAN that also accepts PoE.
The UG67 has two N-female LoRa antenna connectors; the SG50 has one.
The UG67’s LoRa channels are half/full-duplex, the SG50’s are half-duplex. The datasheets do not quantify what that means for throughput, so treat it as an architectural difference rather than a published performance figure.

On cold sites, note the operating ranges differ: the UG67 is rated −40°C to +70°C, the SG50 −30°C to +70°C with battery charging restricted to −20°C to +50°C.

Does going solar make the installation cheaper?

Not on the hardware line. The SG50 is the more expensive of the two on our live pricing, despite the lighter processor and single antenna port — you are paying for the batteries, the cast aluminium housing and the 0.8 W power design, not for more radio. The saving is everything you do not have to install: no supply, no trench, no PoE switch, no electrician. If mains is ten metres away, the UG67 is the cheaper installed answer. If it is a hundred metres away across someone else’s land, the solar LoRaWAN gateway usually wins before you have priced the cable.