2nd Q_A.pdf

36C25624Q0363 Solar Panel Maintenance Services 2nd Set Questions and Answers

2.3 INVERTER

A. Follow manufacturer’s recommended maintenance procedures and inspections. Can we get the manuals? Operation and maintenance manuals are typically found online. The station has some of the manuals. Training perhaps. Unclear what you are asking.

B. Check DC and AC voltage and current and record operating readings. Dashboard? Each inverter is equipped with a SRV display board. The facility uses a data software system to remotely monitor. Contractor must ensure both readings are accurate as needed.

C. Record solar radiance, wind speed and ambient temperature. Dashboard? Each inverter is equipped with a SRV display board. The facility uses a data software system to remotely monitor. Contractor must ensure both readings are accurate as needed.

D. Record inverter enclosure outside surface temperature and weather tight seals.

Dashboard? Each inverter is equipped with a SRV display board. The facility uses a data software system to remotely monitor. Contractor must ensure both readings are accurate as needed.

E. Record Inverter power generation display values. Dashboard? Each inverter is equipped with a SRV display board. The facility uses a data software system to remotely monitor.

Contractor must ensure both readings are accurate as needed.

F. Inspect inverter fans, filters, and proper cooling.

G. Perform inverter manufacture’s recommended inspections and data recording (filter, fan, or pump replacements, MOV, surge protectors, pressure gauges if applicable, heat exchanger, electronics, torque of connections, etc.) Mostly visual except torquing.

Torquing would require a power shutdown. Assuming they are referring to the busbars and bolted lugs.

H. Inspect for signs of infestation, excessive dirt, or contamination.

I. Once a year, conduct a thermographic survey of inverter internal components. Scan DC components, transformers, breakers, visible cable connection. Equipment must be energized for effective IR scanning. IR scanning should occur prior to equipment maintenance.

J. Clean front screens and rear louvers K. Provide maintenance recommendations if a correction is needed.

2.4 BALANCE OF SYSTEM

A. Inspect all conduits (thermal expansion or deterioration), disconnect switches and exercise if possible.

B. Inspect grounding connections and if deemed necessary, measure the ohms between the structure and the known ground. Greater than 25 ohms indicates that corrosion or a poor connection is present, which must be located and corrected.

C. Inspect electrical panel boards enclosures for signs of deterioration.

D. Operate DC and AC electrical switches or circuit breakers and operate if permissible E.

Inspect air transformers and test fan operation and record past maximum temperatures.

Inspect enclosure for signs of deterioration.

F. Inspect oil-filled transformers for signs of leaking oil, enclosure deterioration and record oil level, pressure/vacuum readings and current and maximum past operating temperatures.

G. Inspect heaters, filters, and fans of all enclosures.

H. Inspect and verify communications of all remote monitoring devices and local metering devices.

I. Perform appropriate immediate maintenance in compliance with the contract agreement and/or provide maintenance recommendations.

PART 3 - CORRECTIVE MAINTENANCE 3.1 CORRECTIVE MAINTENACE – GENERAL

A. Contractor must review monitoring system information weekly to determine if there is any corrective action needed. Remote monitoring hopefully? Yes, awarded contractor will be granted access to the data system.

B. Contractor must provide service support one (1) day-per month onsite during the contract period, 8:00 am to 4:30 pm, Monday thru Friday excluding Federal Holidays.

Service support must include a minimum of two qualified manufacturer technicians to adequately perform a complete troubleshoot of the system to determine the corrective action needed. All travel expenses must be included. Why once per month? Once a month is an estimated frequency based on budget allowance.

Contractors must account for the required frequency.

1. Assess any corrective action found in 4.1.A if the correction cannot be adequately identified remotely.

C. Provide documentation to assist facility as described in Part 4.

PART 4 - REPAIRS

4.1 REPAIRS – GENERAL

A. Contractor must prepare an itemized list of recommended repairs or improvements if identified in Part 2 and 3 in this SOW.

The COR will review the itemized list of repairs and improvements and the CO will notify the contractor of which repair and improvement items must be performed. The contractor must not proceed until a change order to this contract is executed.

Notes:

1. What type of data collection, monitoring, and event reporting is currently in place?

Athena powered by stem.

2. Are maintenance records available? Yes, some records are available for FY23.

Records are limited prior to FY23.

3. Would be good to know current system performance and maintenance issues outstanding. Need to get a baseline before taking the responsibility. All systems are performing and maintaining as design. The system was retro commissioned in FY23 to bring performance back to original condition.

4. Do they have electrical drawings for the system? Yes

5. The annual inspection with IR scanning would probably be the best one to bring more resources and deenergize the system to check bus torques, disconnects, circuit breakers, and all the items on the checklist that require the power to be off.

Perform the IR scan first to determine if there are connection issues and then correct if possible and go through the rest of the checklist items. Okay

6. I’m confused with the requirements of PART-3. It states that onsite support is needed one day per month and requires two technicians. Is this for correcting any items found during the weekly review of the monitoring system? Yes Why once per month? Is this based on a previous average or number of trips required to service the system. See above response with copied scope section.