Device Comparison
Chint DTSU666 vs GoodWe GMK330 vs SMA Energy Meter
A solar-ecosystem meter comparison for homes choosing between common inverter-aligned import/export meters.
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Which To Choose
Start with the practical fit, then read the table.
Chint DTSU666
Best fit when three-phase four-wire (3P4W), solar import/export visibility, and local dashboards and Home Assistant.
GoodWe GMK330 Smart Meter
Best fit when 1P2W / 3P3W / 3P4W, solar import/export visibility, and local dashboards and Home Assistant.
SMA Energy Meter
Best fit when uS split-phase; 208 V with added third CT; not 3-phase 480 V., solar import/export visibility, and local data access.
Use this comparison when the meter is being chosen mainly to support inverter monitoring, export control, or energy management inside a broader solar brand ecosystem.
At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
Chint DTSU666
- Phase
- Three-phase four-wire (3P4W)
- Installation
- Indoor DIN-rail mounted direct-connected meter in an IP20 enclosure
- Measurement
- Bidirectional three-phase smart energy meter measuring import/export energy and electrical parameters over RS485 Modbus RTU
- Max current
- 80 A
GoodWe GMK330 Smart Meter
- Phase
- 1P2W / 3P3W / 3P4W
- Installation
- Indoor DIN-rail mounted IP20 smart meter with external CTs.
- Measurement
- CT-based three-phase smart meter for consumption, demand, load monitoring, export power limit, and zero-feed applications.
- Max current
- 120 A
SMA Energy Meter
- Phase
- US split-phase; 208 V with added third CT; not 3-phase 480 V.
- Installation
- Main service-panel retrofit meter with mounting adapter; Ethernet to LAN/router/inverter, optional RS485 backup link.
- Measurement
- CT-based home-consumption and energy-management meter for SMA self-consumption, battery, peak-shaving and zero-export use cases.
- Max current
- 200 A
Before You Decide
Checks that matter before price.
- Confirm your supply type first: single-phase, split-phase, or three-phase.
- Decide whether DIN-rail wiring, CT clamps, or utility-meter access fits your switchboard.
- Choose between cloud convenience and local data access before comparing prices.
- For solar homes, make sure import, export, and load readings are measured at the right point.
| Install fit | |||
|---|---|---|---|
| Phase support | Three-phase four-wire (3P4W) | 1P2W / 3P3W / 3P4W | US split-phase; 208 V with added third CT; not 3-phase 480 V. |
| Installation | Indoor DIN-rail mounted direct-connected meter in an IP20 enclosure | Indoor DIN-rail mounted IP20 smart meter with external CTs. | Main service-panel retrofit meter with mounting adapter; Ethernet to LAN/router/inverter, optional RS485 backup link. |
| Measurement | Bidirectional three-phase smart energy meter measuring import/export energy and electrical parameters over RS485 Modbus RTU | CT-based three-phase smart meter for consumption, demand, load monitoring, export power limit, and zero-feed applications. | CT-based home-consumption and energy-management meter for SMA self-consumption, battery, peak-shaving and zero-export use cases. |
| Max current | 80 A | 120 A | 200 A |
| Meter fit | |||
| Accuracy class | Class B / 1.0 (MID Certified) | Class 0.5 voltage/current and active energy; Class 1 reactive energy | US meter accuracy: current 1.5%, voltage 0.5%, total active energy 2.0%. |
| Current sensing | Direct connection 0.25-5(80)A; DTSU666-CT variants are separate CT-input models | 3 external CTs included; 120 A:40 mA CT ratio. | US kit includes 2 x 200 A clamp-on CTs; 208 V service requires adding a third CT and an additional conductor per SMA guidance. |
| Monitoring | |||
| Protocol | RS485 / Modbus RTU | RS485 | Ethernet / RS485 / SMA Speedwire / Modbus RTU |
| Local API | Yes | Yes | Yes |
| Cloud dependency | No native vendor cloud dependency in the reviewed CHINT source set; integration is via local RS485 Modbus RTU to an inverter, BMS, SCADA, EMS, or gateway. | Local RS485 meter link; SEMS / GoodWe cloud monitoring is optional through the wider inverter system. | Local Ethernet / RS485 data path to the SMA system; SMA Energy App and Sunny Portal are used for app/cloud monitoring. |
| Home Assistant | Yes | Yes | No |
| Solar fit | |||
| Solar import/export | Yes | Yes | Yes |
| Buying context | |||
| Price range | Unknown | Installer-supplied or bundled with compatible GoodWe systems | Unknown |
| Availability | Global CHINT product range with localized availability through CHINT subsidiaries and distributors | Global GoodWe residential smart-meter range; regional availability and compatible inverter lists vary by market and distributor channel. | USA / Canada for the EMETER-US-50 SMA Energy Meter-US variant through SMA America and authorized distributors. |
| Source check | |||
| Last verified | Jun 17, 2026 | Jun 8, 2026 | Jun 7, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs |
Verdict
Choose the meter that best matches the inverter family and installer workflow you already expect to use, because ecosystem fit matters more here than raw feature count.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 3 energy meter options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Can these devices work with local dashboards or Home Assistant?
Chint DTSU666, GoodWe GMK330 Smart Meter list Home Assistant support in the catalog. Chint DTSU666, GoodWe GMK330 Smart Meter, SMA Energy Meter are marked with local API support. Confirm firmware, region, and integration maturity before treating this as a final compatibility guarantee.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.