Microsoft Word - 80266993 VOC_PCS_MSAC.docx
Verification of Conformity
Summary
This report provides a detailed assessment of the compliance of the Lunar System with the requirements specified in UL 1741-CRD PCS and UL 3141-issue 1 standards. The evaluation was conducted under controlled conditions, ensuring adherence to the outlined certification requirements. The testing, verification, and evaluation activities focused on verifying the Power Control System (PCS) integrated into these products.
| Master Contract: | 302773 |
|---|---|
| Report Number: | 80266993VOC |
| Project Number: | 80266993 |
On the basis of the evaluations undertaken, the sample(s) of the below product have been found to comply with the requirements of the referenced specifications at the time the tests were carried out.
| Applicant Name & Address: | Lunar Energy, Inc755 Ravendale Dr, Mountain View, CA 94043, USA |
|---|---|
| Product(s) Tested: | Lunar ESS,Lunar Inverter,Lunar Meter Socket Adapter controller (MSAC),and ConnectDER,Inc:Meter Socket Adapter(MSA). |
| Model(s): | LunarESS:LE-ESS-20KWH,LE-ESS-15KWH,L2-ESS-15KWH,L2-ESS-20KWH,L2-ESS-25KWH,L2-ESS-30KWH,LunarInverter:10-005025,LunarMSAC:LE-MSAC-01,ConnectDERMSA:V-1-A-X. |
| Additional Devices Required for PCS Functionality(Optional) | None. |
|---|---|
| Maximum PCS controlled Current(Bridge&Main Panel) | 200A |
| RelevantStandard(s)/Specification(s): | UL 1741/Inverters,Converters,Controllers AndInterconnection System Equipment For Use WithDistributed Energy Resources[UL 1741,3rdEd,September 28,2021,Revision May 19,2023]Power Control Systems(PCS)CertificationRequirement Decision Date:2023-04-08,Revised:2024-01-18.UL 3141/Outline of Investigation for Power ControlSystems,[UL 3141,issue Number:1,January 11,2024] |
| Date of test(s): | 2025-07-11 to 2025-08-14 |
| Verification Issuing Office Name andAddress: | CSA GroupSuite 138-13888 Wireless Way,Richmond,BC,V6V 0A3 |
| Verification / Report Number(s): | Lunar ESS:80187942.(CSA Group)Lunar Inverter:80121274.(CSA Group)Lunar MSAC:106184038DAL-001.(Intertek)ConnectDER MSA:105948363DAL-001(Intertek) |
| Manufacturer's equipmentinformation&instructionsdocuments,UL 1741 CRD,Section 208;UL 3141,Section 11: | Refer to:Lunar Battery Installation Manual,Meter Socket Adapter Controller (MSAC)Installation Manual |
Lunar Power Control System (PCS): (Alternate Configuration).
The Lunar Battery system, consisting of the Inverter and Battery Block, combined with the Lunar Meter Socket Adapter Controller (MSAC) and third-party Meter Socket Adapter (MSA), is certified for compliance with UL 1741 PCS CRD and UL 3141 Issue 1 standards, where the PCS controller is integrated within the Lunar Inverter, and demonstrating an open-loop response time of less than 2 seconds.
PCS settings are not mandatory for system installation; however, installers have the option to configure these settings to facilitate compliance with National Electrical Code (NEC) requirements and/or specific utility interconnection requirements.
NOTE 1: The Lunar PCS is supplemental protection; therefore, all PCS controlled busbars or conductors shall be protected with suitably rated overcurrent devices appropriately sized for the busbar rating or conductor ampacity. The maximum operating currents in controlled busbars or conductors are limited by the settings of the power control system and may be lower than the sum of the currents of the connected controlled power sources. The settings of the PCS controlled currents may be used for calculation of the design currents used in the relevant sections of NEC Article 690, 705,706, 750, 220, 710, and elsewhere as applicable for supplemental protection. To fully address system-level overloading or short-circuit issues, overcurrent protective devices remain essential, as outlined in the product instruction manual and NFPA 70.
NOTE 2: Please refer to verification of Conformity Letter 80233547VOC for additional information on the other configurations for Lunar PCS.
Whole Home: Lunar Battery with Meter Socket Adapter + Controller
Details on above PCS diagrams:
| Options | Max Limit | Controlled Conductor/Busbar | Current Sensors details |
|---|---|---|---|
| MSA Limit(optional) | 200A | Main panel busbar and feeder | Meter Socket Adapter(MSA)CTs are factory installed |
| Export Limit(Optional) | 48kW | Limits are controlled at the Main panel busbar at MSA. | BMeter Socket Adapter(MSA)CTs are factory installed |
PCS Functionality:
Lunar PCS fulfills the following functionalities for control of sources, loads or combinations of both:
| No. | PCS Functionality |
|---|---|
| 1. | Power Import Limiting(PIL) |
| 2. | Power Export Limiting(PEL) |
| 3. | Busbar Overload Control(BBOC) |
| 4. | Feeder Conductor Overload Control(FCOC) |
ESS Operating Modes:
Lunar PCS is rated to perform PCS control active power exchanges between the Area EPS and energy storage system (ESS), following functions are supported by the PCS. Each mode has been evaluated and complies with the requirements of the above-mentioned standards.
| PCS ESS Modes | Import Permission | Export Permission | Description | Maximum Open Loop Response time(msec) | Average Open Loop Response time(msec) |
|---|---|---|---|---|---|
| Unrestricted Mode | Charge from the grid is allowed. | Battery&PV | The battery can charge from PV and the grid.Battery and PV can export to the grid. | 61.535msec | 5.6918msec |
| Export Only Mode | Charge from grid is not allowed | Battery&PV | The battery can charge from PV only.Battery and PV can export to the grid. | 753.598msec | 11.19373msec |
| PCSESS Modes | Import Permission | Export Permission | Description | Maximum Open Loop Response time(msec) | Average Open Loop Response time(msec) |
|---|---|---|---|---|---|
| Import Only Mode | Charge from the grid is allowed. | PV Only | The battery can charge from PV and the grid.Only PV can export to the grid. | 309.262msec | 10.0109msec |
| No Exchange Mode | Charge from grid is not allowed | PV Only | The battery can charge from PV only,Only PV can export to the grid. | 226.679msec | 12.08352msec |
Test Summary:
The testing confirmed the key functionalities of the PCS. Following testing were performed and testing procedures adhered strictly to the requirements of the standards. External current sensors listed below were integrated and validated to ensure precision in the current measurement and system monitoring.
| UL 1741 CRD | UL 3141 | Test | Result |
|---|---|---|---|
| 203.5 | 8.3 | Step Change in Load Test | PASS |
| 203.6 | 8.4 | Step Change in Generation Test | PASS |
| 204.1.1 | 8.6.2 | Export Limiting from all sources to EPS | PASS |
| 204.1.1 | 8.6.2 | Export Limiting from all sources to EPS-Generation | PASS |
| 204.1.1 | 8.6.2 | Import Limiting from area EPS | PASS |
| 204.1.1 | 8.6.2 | Import Limiting from area EPS - Generation | PASS |
| 204.4 | 8.6.5 | Export Limiting from Energy Storage Systems(ESS) | PASS |
| 204.5 | 8.6.6 | Import Limiting to Energy Storage Systems(ESS) | PASS |
| 205.5 | 8.7 | Startup/Self check Abnormal Tests | PASS |
| 205.7 | 8.7 | Operating Abnormal Tests | PASS |
External Current Sensors to be used for PCS for this configuration:
None.
Marking Labels:
Appropriate marking labels were reviewed and verified for compliance with UL1741, UL 3141 labeling requirements. Following Markings are provided for PCS:
1. Panel Limit label:
○ A limit label applied to the panelboard where the MSA is installed.
○ For both Limit labels the installer shall write in the User Set Limit
2. Lunar Inverter Label:
3. Lunar ESS Label:
Conclusion:
The Lunar PCS system has demonstrated full compliance with the applicable standards, reflecting its capability to perform critical power control functions reliably and safely.
Thank you for the opportunity to service your product testing needs. Please do not hesitate to contact our engineering or sales team for any questions you may have.
Issued by:
Signature
: PeterLim
Name: Peter Lim
Date: August 25, 2025
Power and Energy