Annual Maintenance Checklist

A Trained Operator can perform the following maintenance tasks. If any maintenance items fail, measures should be taken to remedy the problem and prevent damage to the energy storage system.

The following maintenance tasks should be performed once a year, in addition to the tasks listed in the Monthly Maintenance Checklist and the Quarterly Maintenance Checklist.

Cabinet ID:
Technician:
Date:

✅ System Annual Test (SAT)

Task

Pass/Fail

Notes

The SAT is performed by a Qualified Service Operator.

Full system test of the fire detection, suppression, and control logic.

☐ / ☐

This test is an exception to all the other annual maintenance tasks that can be performed by a Trained Operator.

✅ Inverter / Battery Functional Test

Task	Pass/Fail	Notes
Using the inverter interface, verify charge/discharge and closed-loop control between battery and inverter.	☐ / ☐

✅ Grounding Resistance Check

Task	Pass/Fail	Notes
Measure cabinet ground resistance (<1Ω). Clean contact points, if required.	☐ / ☐

✅ Cabinet

Task	Pass/Fail	Notes
Inspect enclosure seams and structural joints. Perform resealing if required.	☐ / ☐
Confirm the airways of the deflagration vent are clear.	☐ / ☐
Inspect cooling fans inside the cabinet	☐ / ☐
Replace if fan is failing or vibrating, or an alarm is detected. Replace Cooling Fans Inside the Cabinet	☐ / ☐

✅ LYNK II

Task

Pass/Fail

Notes

Check current firmware of the LYNK II. Apply updates per Discover’s documentation and procedures.

☐ / ☐

Update the BCU firmware only as directed by Discover Energy.

☐ / ☐

Use LYNK ACCESS to confirm fault-free operation.

Log any active communication or sensor faults.

☐ / ☐

✅ Fire Suppression System

Task	Pass/Fail	Notes
Visually inspect the aerosol canister (FS0050) for corrosion, physical damage, or displacement.	☐ / ☐
Confirm the canister is securely mounted. Check the tightening marks on mounting screws to ensure canisters have not moved or loosened.	☐ / ☐
Inspect the wiring and sensor positioning.	☐ / ☐

✅ Battery Pack

Task

Pass/Fail

Notes

Visually inspect for physical damage, swelling, or corrosion.

☐ / ☐

Check for discoloration or other signs of overheating on the battery cables, wires, ring terminals (wire ends), and fuses.

☐ / ☐

Verify all battery and busbar terminals are torqued to spec.

M10 bolts: 35 to 45 N·m (25.8 to 33.2 ft-lb)

Racks: 16 to 25 N·m (11.8 to 18.4 ft-lb)

☐ / ☐

✅ Thermal Management System

Task

Pass/Fail

Notes

Remove dust and debris from airflow paths and filters.
Clean the exterior door vent screen and the TMS screens.
- Depending on the operating environment, door vent and TMS screens may require cleaning more than once a year.

☐ / ☐

Confirm inlet/outlet temperatures.

Use an infrared thermometer on the front of the TMS to confirm it is operating at the correct temperature (outlet temp around 20ºC/68ºF, and inlet temp higher)

☐ / ☐

✅ Dehumidifier System

The dehumidifier is part of the auxiliary systems and powered via the 24 V UPS.

Task	Pass/Fail	Notes
Clean or replace filters	☐ / ☐
Confirm power supply voltage (24 Vdc) is within range.	☐ / ☐
Confirm operation and airflow. Check for errors on the screen.	☐ / ☐
Confirm CAN communication status with LYNK ACCESS.	☐ / ☐
Check for fault codes or malfunction indicators in LYNK ACCESS.	☐ / ☐
Confirm the firmware and parameter settings match the expected configuration.	☐ / ☐

✅ Manual Service Disconnect (MSD)

Task

Pass/Fail

Notes

Turn off the system.

Remove and reinsert each MSD to confirm physical integrity and contact performance.

☐ / ☐

Verify the terminals on the Fused DC Distributor are torqued to spec.

☐ / ☐

Check for discoloration or other signs of overheating on the battery cables, wires, ring terminals (wire ends), and fuses.

☐ / ☐