Are Powerline Adapters Worth It? How They Work

Powerline adapters are worth trying when you can’t run an Ethernet cable and Wi-Fi can’t reach a room well. They are not a sure thing. They send data over your home’s electrical wiring, so speed depends on that wiring and on what else is plugged in. The speed printed on the box is a theoretical maximum.

This is a research-based guide built from Netgear, TP-Link and devolo documentation. We have not tested powerline adapters in our own homes, so there are no speed results here.

Quick answer: should you buy powerline?

How do powerline adapters work?

Netgear says powerline adapters “use your home’s electrical wiring to transmit internet data.” You plug one adapter into an outlet near your router and connect it with an Ethernet cable. You plug the second into an outlet in the room that needs a connection, then connect a device, a TV or a mesh point to it.

TP-Link says that “in most cases” its adapters pair automatically. Netgear notes that powerline products have both a network password and a device password, and some older adapters have no reset or security button.

Why is the speed on the box so high?

Powerline ratings are theoretical. TP-Link says figures such as “600Mbps, 1200Mbps, or 2000Mbps are the highest powerline rate in theory.” Netgear sells the Powerline 2000 (PLP2000), rated “up to 2 Gbps.”

Those figures describe the electrical link under ideal conditions, not what a laptop will measure. TP-Link lists the things that pull real speed down:

• Power strips and surge protectors. Adapters “should always be plugged directly into a wall outlet.”
• Appliances with motors, such as air conditioners, washing machines, fans and kitchen appliances, which “can interfere with powerline signals.”
• Phone and laptop chargers, which “can introduce noise on the power line.”
• Distance. TP-Link gives a maximum range of 300 meters, but says noise and line quality reduce the effective range.

Will powerline work in my home?

Wiring is the deciding factor, and you can’t see it. The practical rules from the manufacturers:

1. Same circuit. Netgear says both adapters should be on the same electrical circuit. TP-Link says adapters on separate circuits can pair but won’t communicate.
2. Phases. TP-Link says powerline works across phases, but the rate drops. If an adapter pair is slow, try a different outlet for the remote unit.
3. Wall outlets only. Netgear says performance is “always better” plugged directly into a wall socket. TP-Link adds that some outlets with a built-in surge protector “can also cut the powerline connection.”
4. Keep away from noisy devices. Netgear’s product page also advises avoiding outlets near high-power appliances.

Because results vary, buy from a retailer with an easy return policy and test the connection with a wired speed test on day one.

HomePlug AV2 vs. G.hn: which standard?

Two standards are on sale:

• HomePlug AV and AV2. Netgear says “compatibility of the adapters is based on its HomePlug version,” and that HomePlug AV and the older HomePlug 1.0 networks can share a home but “cannot communicate with each other.”
• G.hn. Devolo describes G.hn as a standard developed by the International Telecommunication Union. Devolo moved its Magic adapters from HomePlug AV2 to G.hn and claims G.hn is faster; we have not verified that claim.

They don’t mix. TP-Link says: “G.hn powerline adapters are not compatible with HomePlug AV/AV2 powerline adapters.” Buy a matched kit, and check the standard on the box before adding another adapter later.

Powerline for mesh Wi-Fi

A powerline link can act as a wired backhaul for a mesh point, which frees the mesh system from relaying all traffic over Wi-Fi. Check that your mesh system supports Ethernet backhaul first. Our guide to wired vs. wireless mesh backhaul explains when that matters. Some powerline kits also include a Wi-Fi access point in the remote adapter, which can cover a single room without a full mesh system.

If you’re fixing one weak room, start with our guide to finding and fixing Wi-Fi dead zones.

Fact-check notes

Bottom line

Powerline is a reasonable fix for one hard-to-reach room when Ethernet and MoCA aren’t options. Treat the box speed as a ceiling, plug both adapters straight into wall outlets on the same circuit, buy a matched kit, and test it while you can still return it.