SONOFF Smart Stackable Power Meter (SPM): SONOFF's product image of the Smart Stackable Power Meter (SPM) on its own product page. The image carries small connectivity icon badge (Wi-Fi/Zigbee/Matter) at lower left; shows Main unit and 4-Relay together (no clean image of this exact model is published).

1 photo · Image from sonoff.tech

Photo sources

Manufacturer and seller images. Configuration examples may include additional equipment.

Image source: SONOFF's product image of the Smart Stackable Power Meter (SPM) on its own product page. The image carries small connectivity icon badge (Wi-Fi/Zigbee/Matter) at lower left; shows Main unit and 4-Relay together (no clean image of this exact model is published).

SONOFF Smart Stackable Power Meter (SPM)

Name: SONOFF Smart Stackable Power Meter (SPM)
Brand: SONOFF
SKU: SPM

By SONOFFSKU SPM

Energy monitors

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Device typeNot yet documented Max switched load (A)Not statedMax switched load (W)Not statedMeasurement channelsup to 128 (32 SPM-4Relays x 4)Current sensorsNot stated Current ratingNot stated

Key specs

Units

SKU: SPM
Official product page
Sources
Printed as "Model SPM".
Official product page: SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: page Specification table
Documented
Communications: 802.11 b/g/n 2.4GHz
Official product page
Sources
Printed as "Wi-Fi 802.11 b/g/n 2.4GHz".
Official product page: SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Measurement channels: up to 128 (32 SPM-4Relays x 4)
Official product page
Sources
Printed as "can control up to 128 channels by connecting to 32 SPM-4Relays. Each channel handles up to 20A".
Official product page: SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented

All specs2

Communications: 802.11 b/g/n 2.4GHz
Official product page
Sources
Printed as "Wi-Fi 802.11 b/g/n 2.4GHz".
Official product page: SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Measurement channels: up to 128 (32 SPM-4Relays x 4)
Official product page
Sources
Printed as "can control up to 128 channels by connecting to 32 SPM-4Relays. Each channel handles up to 20A".
Official product page: SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented

Published claims and calculations, not independent test results.

Documents

2 on file

PDF
SONOFF Smart Stackable Power Meter (Main Unit+4-Relays) SPM-Main / SPM-4Relay User manual (V1.0 20210924)OfficialSONOFFOfficial instruction manual
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-12.
Location: Whole document
Retrieved Oct 12, 2026
SONOFF's own document, downloaded October 12, 2026 with the paced research fetcher. Manufacturer statements, not independent tests.
Archived copies
Archived copy of a document published by SONOFF. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived backup Revision not recorded · 1.28 MB
Archived copy, unaltered, kept as a record of what SONOFF published. Original address: https://cdn.shopify.com/s/files/1/0742/9963/8001/files/user_manual_SPM-Main_SPM-4Relay_V1.0_20210924.pdf. Copyright and takedown
Source first found
Oct 12, 2026
This copy captured
Oct 12, 2026, 10:31 AM PDT
Archived
Oct 12, 2026, 10:31 AM PDT
File details
Original source
Pages
21
Embedded creation date
Sep 24, 2021
Embedded modification date
Sep 24, 2021
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 6a8e08877fa425f53ff42993f27f17766f9fa1d2093514fe496c2b7b2d272496
Open
WEB
SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026)OfficialSONOFFOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-12.
Location: Product page
Retrieved Oct 12, 2026
SONOFF's own product page, captured October 12, 2026 with the paced research fetcher. Manufacturer statements, not independent tests.
Open

Archive and older revisions0

Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.

Archived documents

SONOFF Smart Stackable Power Meter (Main Unit+4-Relays) SPM-Main / SPM-4Relay User manual (V1.0 20210924)

Archived copy of a document published by SONOFF. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.

Archived backup Revision not recorded · 1.28 MB

Archived copy, unaltered, kept as a record of what SONOFF published. Original address: https://cdn.shopify.com/s/files/1/0742/9963/8001/files/user_manual_SPM-Main_SPM-4Relay_V1.0_20210924.pdf. Copyright and takedown