FAQ #366
Energy Meter - Questions and Answers

Last Updated On 10/24/2025 06:07:39 PM by

sayovitz

Question
Formula SAE Electric will use the Energy Meters introduced for 2025

We have received questions about the Energy Meter. This FAQ may be revised as more details become available.
Answer
Energy Meter User Manual

The Energy Meter User Manual is available on the FSAE Online website, Series Resources, Technical Inspection Resources, Electric Vehicle, Energy Meter Resources. This User Manual contains supplemental Rules requirements and additional information about the Energy Meter

Manual Service Disconnect (MSD)

Q: May we use the new Formula SAE Energy Meter as the Manual Service Disconnect (MSD)? Or is a separate MSD required?
A: No. The Manual Service Disconnect (MSD) must be separate from the Energy Meter. See Formula SAE Rules EV.5.5.2

Receptacle

Q: We know we will have to purchase the receptacle. Can we just buy one ourselves?
A: No. The receptacle is a Amphenol part number MSDXLF000F that has been modified to include additional low voltage connectors

Q: When and where can we purchase the receptacle?
A: We are working on the process and timeframe for this. Please watch the newsfeed for any announcements.

Connections

Q: What are the details of the connection between the new Energy Meter and the Tractive System?
A: The receptacle that your team must include is a modified Amphenol part number MSDXLF000F (front mounted). The HV connection points are as provided on that plug, refer to vendor information and the Energy Meter User Manual for dimensions.

Q: What are the details of the power requirements and low voltage signals?
A: Other connectors will be included in the receptacle. Your team will have to connect the provided wires from these connectors into your circuits for GLV power and signals. This includes an interlock that is part of the receptacle/plug and needs to be included in your Shutdown Circuit. Refer to the Energy Meter User Manual

Q: May we integrate the wire connections on the receptacle into our wiring harness?
A: Yes, Be aware that the connectors in the receptacle “float” in their mounting and must be able to move so that the connectors will align properly. Make sure the wires are not pulled tight and allow the connectors to move. Refer to the Energy Meter User Manual for more details.

Before Competition

Q: Can we test our vehicle without an Energy Meter installed? How will we do this?
A: Yes, your team should purchase Amphenol part number MSDXLM000, this is the "plug" that the Energy Meter is based on. At the Formula SAE Electric competition, you will remove your plug and install the Energy Meter.

Q: Do we need to purchase this spare plug from SAE or a designated supplier?
A: No. The stock Amphenol plug will fit in the receptacle. Use whatever supplier you would like

Location

Q: Where should we physically locate the Energy Meter?
A: The receptacle must be accessible without opening the Accumulator Container. The download connector on the outside face of the plug must be directly accessible. The intent is that your team will be able to connect and download at any time during the event. The officials may also want to connect to the energy meter. Refer to the Energy Meter User Manual for more details.

Q: May we connect an intermediate cable to the download connector and route that to a more accessible location?
A: No, we need a direct connection to the download connector. It is ok if the download connector is behind something that is easily removeable and does not require a reinspection after removal - an access panel, bodywork, etc.
No Attachments
Rule Numbers
2025:EV.3.2 
2025:EV.5.5