External Energy Meter Installation - CHINT DTSU666

IMPORTANT NOTE

The only compatible energy meter that can be connected to the Solis S6-EH2P(9.6-16)K03-SV-YD-L-US hybrid inverter series is the CHINT DTSU666 meter. There are many similar variations of this meter that can be found for sale online on various websites -- none of them are compatible with this inverter. The only compatible version of the CHINT DTSU666 energy meter must be purchased separately from a Solis-authorized distributor. It is not possible to connect a different brand/model of meter such as WattNode, etc. because those meters have not been mapped and will not communicate with the Solis hybrid.

The reason for this is the meter kit comes from the Solis factory pre-programmed with all of the right settings to work with the Solis inverter. The meter settings themselves are often locked and unable to be modified. This is why the meter kit must be purchased from Solis through an authorized distributor. Solis services and warranties the meter and will replace it if it fails.

List of Solis-Authorized Distributors: https://www.solisinverters.com/us/wheretobuy.html

When the Meter Kit is Required

1. If the inverter must be installed more than 16 feet from the utility POCC. Since the included CT wires are about 16.16 feet long and they cannot be extended, if the distance between the inverter and CTs is to be greater than 16 feet, the CHINT meter must be installed. The meter connects to the inverter with RS485 and can be run 300 feet without issues. Put simply, the CT wires cannot be extended so the solution is to install the meter. 

2. The maximum system current is large. Since the CTs included are rated for 250A, if the maximum system current is greater, the meter kit must be purchased. The meter kit includes 600A-rated CTs. There is a second meter kit that includes 1000A-rated Rogowski coils.

3. Rigid split-core CTs will not fit around the current carrying conductors. If the conductors that connect the utility to the inverter or to the system are large, flexible CTs (Rogowski coils) may need to be installed. The second meter kit includes Rogowski coils that are rated for 1000A.

Optional Meter Kits - Sold Separately by Solis-Authorized Distributors

Standard Meter Kit

SKU: CHINT DTSU666

Included Components: x2 CTs rated for 600A/5A and x1 CHINT DTSU666 meter

Rogowski Coil + Meter Kit꞉

SKU: CHINT DTSU666 (Rogowski Coil)

Included Components: x2 Rogowski coils rated for 1000A and x1 CHINT DTSU666 meter

Important Note: No other meter type can be used with this inverter. That includes other CHINT DTSU666 metesr purchased from third-party vendors not authorized by Solis. Do not attempt to purchase this meter from any merchant that is not a Solis-authorized distributor, it will not work with the Solis inverter. 

How to Recognize the Only Compatible Version of the CHINT DTSU666 Meter

There is only one type of CHINT DTSU666 meter that will work with the Solis inverter but there are many variations of this meter available for sale online from unauthorized vendors (not Solis-authorized distributors). There are three key ways to tell the right version from the wrong ones. Below are some photos showing examples of similar but not compatible meters. The one compatible version is the one at the bottom-middle with a green check mark on it.

1. The model number in the top right corner just under the “CHINT” brand in blue should display as “DTSU666” without anything else included. Sometimes there is a “-20” or a “-H” or some Chinese character. If you see something after DTSU666 then it is not a compatible meter.
2. The CT ratio should show as “CT: 250A/50mA” just down and to the left of the LCD screen. If it shows anything different, it is not compatible. 
3. Many of the other similar but non-compatible meters will look a little different from the compatible version. There should be an RJ45 (ethernet) port for RS485 communication and you should not have to open any protective covers to reach the terminals. 

Clear Photos of the Only Compatible Version of the CHINT DTSU666 Meter

Note: Your meter should look like this one. If it looks any different, it is not compatible.

Meter Installation Guide Video

Meter Manual and Installation Steps

The attached manual explains how to install this meter with the inverter. 

The CTs will connect to the CHINT meter instead of to the inverter. The meter will need split‑phase (240V L1-L2-N) power from a 2‑pole (15A) circuit breaker. The diagram below shows how to install the meter and CTs. Connect the meter to the inverter with a standard ethernet cable as the meter and inverter both have RJ45 (ethernet) ports. If you are making a cable, use pins 4 (RS485A) and 5 (RS485B) on both ends. It is recommended to use a factory-made cable since handmade cables can be made improperly. Be sure to use an ethernet cable tester if you are making your own cable. The “Meter” RJ45 port of the inverter must be used. Do not use the two “Meter” pins, these are not meant for the external energy meter. The meter