BESS maintenance for Malaysian battery storage, from daily checks to ST records

Run the daily, periodic and annual checks in Suruhanjaya Tenaga's BESS safety guideline, send competent persons to each site, and keep every container, rack, inverter and cooling unit's service and warranty history where an auditor can find it.

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Updated 15 Oct 2026

FieldEx scheduling board on desktop with a technician's inspection checklist open on the mobile app, as used by battery storage maintenance teams

FieldEx combines field service management with a computerised maintenance management system (CMMS) for battery energy storage owners, contractors and operations and maintenance (O&M) providers in Malaysia. For BESS maintenance it holds each container, battery rack, inverter and fire system on record, schedules routine and periodic inspections, assigns competent technicians, and keeps the maintenance records Suruhanjaya Tenaga (ST) expects to be kept and accessible.

What FieldEx does for BESS owners and O&M contractors

Battery storage arrives with its own rulebook: Suruhanjaya Tenaga's 2026 BESS safety guideline, Bomba's battery room requirements and the manufacturer's service plan, all on top of the Electricity Regulations 1994. FieldEx puts that work on the asset records of each site, so the daily check, the periodic inspection and the corrective repair for each rack or inverter end up in one history. Book a demo to see it on your own BESS sites.

Sites, containers and inverters on record

One site per BESS facility, solar farm or substation, with its address, map pin, service zone, contacts and every asset and plan under it.
One asset per container, battery rack, inverter, transformer, heating, ventilation and air conditioning (HVAC) unit and fire suppression panel, with serial number, specs, photos and warranty.
Containers as parents, with their racks, HVAC unit and fire panel as components that each carry their own history, in asset management.
The original equipment manufacturer's (OEM) manual, single-line diagram, UN 38.3 report and commissioning results stored on the asset, plus a log of every edit with the user and time.

Daily, periodic and annual checks

Inspections that recur daily, weekly, monthly, quarterly, every 6 months or yearly, each linked to its own checklist.
Planned preventive maintenance (PPM) plans that raise the annual service and longer overhauls by date, by meter reading such as cycles, or whichever comes first.
A fixed calendar, or a schedule counted from the last completed visit, with missed PPM moved forward after a set overdue period. Fixed calendar dates apply to time-based plans.
One plan across every site with the same container model, picking up new containers as they are added, in preventive maintenance.

ST and Bomba deadlines

Certifications per asset type on standard or custom frequencies, such as the five-yearly competent person inspection, with the certifying authority recorded.
Each record shown as due, overdue or done, with reminders by email, in the app or both.
The performer, the date, the result and remarks on every record, with the test report or certificate attached, through compliance documentation.
A dashboard of what is overdue, what falls due in the next 7 days and what was finished in the last 7 days, by site or service zone.

Readings and abnormal findings

Number fields on the job for values such as rack voltage, current and container temperature, entered exactly by the technician on site.
Container and HVAC temperatures logged as meter readings on the asset, giving a dated trend from visit to visit.
A "No" on a checklist question, such as unusual smell or water ingress, raising the corrective job and its tasks immediately, with an optional follow-up inspection.
A warning when a new job repeats a recent job on the same inverter or rack, in work order management.

Technicians on site and offline

The FieldEx mobile app in English, Bahasa Malaysia and Chinese, with the asset's history, its checklist, watermarked photos and the client's sign-off.
Jobs and tasks can be downloaded and worked offline, with check-in, check-out and travel synced later.
A QR or barcode sticker on every container and rack, scanned to open the asset and start its checklist.
Ordered procedures, with required steps such as isolation and personal protective equipment (PPE) confirmation that must be ticked off before the job can close.

Competent persons and dispatch

Jobs matched by skill, availability, shift, leave, service zone and live location, with a drag-and-drop scheduler for anything urgent, in scheduling and dispatch.
Response and repair targets per client, in stages, with a warning before a target is missed and a flag when it is.
Each trip logged as a task journey, with distance, travel time and time on site.

Spares, warranties and service contracts

Spare fans, pumps, fuses, contactors and gaskets in each warehouse and each technician's van stock, with transfers and approvals, in spare parts inventory.
A warranty period on each spare part and warranty details on each asset, with every part fitted logged on the job.
Long-term service agreements as contracts with start and end dates, linked to the containers and PPM plans they cover.
A job sheet PDF for each finished job, and reports by site, asset or period, exported or emailed on a timetable.

Reports and records for owners

Completion PDFs with the equipment, fault and resolution, parts used, check-in and check-out times, photos and the customer's signature, emailed with a record of when each was sent.
Reports on asset reliability, maintenance cost and age, and on jobs and inspections by site, exported as CSV, Excel or PDF or emailed on a schedule, in reporting and analytics.
A branded customer portal where the asset owner sees registered equipment with last-serviced dates, upcoming asset maintenance and downloadable job reports.

What inspections does Suruhanjaya Tenaga's BESS safety guideline require?

Suruhanjaya Tenaga's Guidelines on Battery Energy Storage System (BESS) Safety, GP/ST/No.62/2026 (posted May 2026), split the work into routine checks and periodic inspection. The routine checks confirm that alarm indicators and status displays are normal, that the communication and monitoring systems (battery management system, or BMS, and energy management system, or EMS) are working, and look for any abnormal behaviour such as unusual smell, temperature rise, water ingress or impeded airflow. Periodic inspection goes deeper: it verifies the protection systems and inspects electrical connections and earthing for integrity and continuity. For comparison, international guidance from the Country Fire Authority (CFA) in Victoria, Australia, asks for monthly inspections of battery enclosures, containers and related infrastructure for physical damage.

That is a daily walk-round and a periodic technical inspection for every container, and both need a record.

What FieldEx does about it

Daily rounds as inspections: the guideline's routine checks become a daily inspection on each container, with yes or no questions for alarms, displays, smell, heat, water and airflow.
Periodic inspection with its own checklist: protection checks and the connection and earthing inspection run on a longer cycle, with a separate checklist and a qualified technician.
Abnormal findings acted on: an answer that flags smell, heat or water ingress raises a corrective job at once and can schedule a re-inspection.
Missed rounds visible: the dashboard shows overdue inspections by site, so a skipped daily check is seen the same day.

Who can service or repair a BESS in Malaysia?

Only competent persons, or people working under their control. ST's BESS safety guideline states that any repair, replacement, servicing or cleaning of a BESS or its components shall be carried out by competent persons or a person acting under his control. The Electricity Regulations 1994 add a fixed inspection cycle for the wider installation: non-domestic installations must be inspected and tested by a competent person at least once every 5 years.

So each job needs the right registered person named on it, and the five-year inspection needs a date that nobody can lose track of.

What FieldEx does about it

Skills that match the job: each BESS job carries a required skill, and only technicians holding that skill are matched to it. Skills can be named after ST competency classes, such as chargeman or wireman, and after BESS manufacturer authorisations, each with an expiry date.
Supervised work recorded: a job can be assigned to a group, and the technicians who checked in and out are recorded on every task.
The five-yearly inspection as a certification: the competent person's inspection and test runs as a certification with a custom five-year frequency, reminders and the report attached.
Thermal images on file: infrared photos are attached to the job and the asset, with automatic watermarks on photos taken in the app.

Which tests are needed to commission a BESS in Malaysia?

ST's guideline lists electrical safety tests at commissioning, including grounding, insulation, continuity, protective devices, isolation switches and anti-islanding. Before the equipment even reaches site, the guideline requires each BESS to undergo testing to UN 38.3 before transport, with the test report made available. Bomba's thresholds bring in further evidence: Jabatan Bomba dan Penyelamat Malaysia (JBPM) allows larger energy storage quantities only with UL 9540A test results and a Hazard Mitigation Analysis.

Commissioning is therefore a stack of documents, and those documents become the starting point of each asset's history.

What FieldEx does about it

Commissioning as a job with tasks: each test, from insulation resistance to anti-islanding, is a task on the commissioning job, in order, with results entered on the phone.
Test reports on the asset: the UN 38.3 report, UL 9540A evidence and commissioning results are attached to the container's record from day one.
Punch-list items tracked: snags found at commissioning become follow-up jobs on the asset they affect, and stay open until closed.
Baseline readings: the first readings taken at commissioning are stored against each asset, ready to compare with later visits.

What does Bomba require for battery rooms and energy storage systems?

JBPM's fire safety guideline for data centres (Garis Panduan Keperluan Keselamatan Kebakaran Bagi Pusat Data, posted September 2024) sets the clearest Bomba requirements for battery rooms and energy storage systems. It requires aspirating smoke detection (ASD) and automatic sprinklers, and allows battery rooms and energy storage systems to be placed up to 18 metres high, measured to the last occupied floor. ST's BESS safety guideline points the same way for indoor systems: if indoor installation is unavoidable, appropriate fire suppression must be provided and the installation must comply with all applicable Fire and Rescue Department requirements.

Once installed, the ASD, sprinklers and suppression system are assets that need their own servicing and records.

What FieldEx does about it

Fire systems as assets: the ASD unit, sprinkler valves and suppression cylinders sit under the battery room or container, each with its own service history.
Service on Bomba's cycle: each fire system runs on recurring inspections and certifications, with reminders before the due date.
Proof for the fire certificate: service reports and certificates are attached to each completed record, ready when Bomba or an auditor asks for them.
Defects to repair: a failed test on any fire system raises a corrective job straight away.

How much battery capacity does Bomba allow in one fire area?

Under JBPM's data centre fire safety guideline, a fire area may hold up to 600 kWh; more is allowed only with UL 9540A results, a Hazard Mitigation Analysis and JBPM approval. The guideline's installation criteria also set a maximum energy storage system size of 50 kWh and a minimum separation of 1 metre.

Those figures belong in the asset register: the rated capacity of each unit, which fire area it sits in and how far it is from the next one.

What FieldEx does about it

Capacity on each asset: each battery unit's specifications, such as its rated kWh, are stored on its asset record.
Fire areas as locations: battery rooms or fire areas can be set up as parent assets, so the units in each one are listed together.
Changes logged: any edit to an asset's details, including moves between rooms, is kept in its change history with the user and time.
The incident on record: the corrective job keeps the times, photos, findings and parts used, on the asset that failed.

What cooling and environmental protection must a BESS container have?

ST's BESS safety guideline requires an HVAC system or equivalent to keep temperature-sensitive parts within their limits, and requires each BESS to be tested to IEC 60529 to verify its IP rating against moisture and pollution. In Malaysia's heat and humidity, that makes the container's HVAC and its seals some of the hardest-working parts on site. For a liquid-cooled design, international practice from the manufacturer plan filed with the Connecticut Siting Council in the United States checks coolant levels, the ventilation system, radiator cleaning and debris on the air inlets every year.

HVAC units, filters and door seals need their own PPM, not just a line on the container checklist.

What FieldEx does about it

HVAC as a component: each container's HVAC or chiller unit is its own asset with its own PPM plan, filters and spare parts.
Temperature trends: container and coolant temperatures recorded as meter readings show whether cooling is keeping up between visits.
Seals and ingress checked: door seal and water ingress questions sit on the routine checklist, and photos of any damage are attached to the job.
Filter changes on schedule: filter cleaning and replacement can run monthly or quarterly, separate from the annual service.

What BESS maintenance records must be kept in Malaysia?

ST's BESS safety guideline is direct: all records of maintenance shall be kept, periodically updated and be accessible to relevant persons. It also lists routine maintenance tasks such as updating BMS or EMS software or firmware where required. The Electricity Regulations 1994 add a reporting duty for installation inspections: the competent person gives the owner an inspection report of findings, recommendations and instructions within 2 weeks of the inspection, and the owner keeps a book of records and reports.

A digital record that the owner, the O&M contractor and the auditor can all reach covers each part of that.

What FieldEx does about it

Every record on the asset: jobs, inspections, readings, photos, certificates and parts used stay on the asset and site, with an edit log.
Firmware updates tracked: BMS and EMS updates run as jobs with the date, the technician and notes on what was changed.
Reports to the owner on time: the job sheet PDF is generated on completion and emailed, with a log of when it was sent, well inside a one-week deadline.
Owner access: the branded customer portal lets the owner see equipment, last-serviced dates and planned work, and download job reports.

What PPE do technicians need when maintaining a BESS?

ST's guideline states that personnel involved in maintenance work, or working on or near live parts of a BESS, shall wear appropriate PPE. The right kit depends on the task and the manufacturer's procedure, so the requirement belongs on the job itself, where the technician sees it before starting.

A plan is only as good as the contact list, the site drawings and the response times behind it, so those need to be kept current.

What FieldEx does about it

PPE as a required step: a PPE confirmation task can be placed first in the job's procedure, and it must be completed before the job can close.
A photo as evidence: the technician can attach a watermarked photo of the PPE in use.
Hazard notes on the asset: live-part warnings and the OEM's safety notes are attached to the asset and shown to the technician on the phone.
Plan reviews scheduled: the yearly review of the emergency plan runs as a recurring site job, created ahead of its due date.

What grid-scale BESS projects are coming to Peninsular Malaysia under MyBeST?

ST's statement of 19 December 2025 on the request for proposals for MyBeST covers battery energy storage with a total capacity of 400 MW/1,600 MWh for Peninsular Malaysia. It says four grid-connected BESS projects, each of 100 MW/400 MWh, will be commissioned in 2027.

Those four sites will need commissioning records, daily checks, periodic inspections and long-term service from their first day of operation.

What FieldEx does about it

Ready before energisation: sites, containers, racks and inverters can be uploaded before commissioning, so the history starts with the first test.
The same plan on every site: one PPM plan can cover all containers of the same model across several projects.
Owner and contractor on one record: the asset owner follows the work through the customer portal while the O&M contractor runs it in FieldEx.
Contractors included: grounds contractors can be set up as a user group, so the jobs go to them and the record stays on your site.

What causes most BESS failures worldwide?

International data from the Electric Power Research Institute (EPRI) in the United States points to how systems are put together. Its May 2024 analysis of the BESS Failure Incident Database finds integration, assembly and construction to be the most common root cause of BESS failures. The New York State Energy Research and Development Authority (NYSERDA), in its February 2026 guidebook, notes that thermal runaway can follow mechanical abuse (physical damage), electrical abuse (short circuits or overcharging) or thermal abuse.

For an O&M team in Malaysia, that puts connections, enclosure damage and controls at the top of every inspection.

What FieldEx does about it

Damage and defects on record: each defect is logged on the rack, inverter or enclosure where it was found, with photos.
Patterns across sites: reports group faults by asset type, model or site, showing where problems repeat.
Asset status updated: an inspection can change the asset's status, for example to out of service, until the repair is done.
Service agreements linked: the long-term service agreement is a contract with start and end dates, linked to the assets and plans it covers.

How long does a grid battery last before the cells need replacing?

International planning figures from the US National Renewable Energy Laboratory (NREL) use a 15-year technical life for utility-scale battery storage in the Annual Technology Baseline (ATB 2024), and assume all battery cells are replaced at year 15 in a 30-year PV-plus-battery project. NREL's O&M best practice guide (3rd edition, December 2018) adds that maintenance costs rise as a battery plant ages, so owners should plan when to replace batteries and do it in phases.

The cost and fault history of each rack is what tells you which ones go first.

What FieldEx does about it

Cost by asset: maintenance cost, reliability and age reports show which containers and racks are draining the budget.
Replacement tracked as a project: a phased cell replacement can run as a project, listing its sites, assets, jobs and tasks together.
Old and new on record: retired racks keep their history, and replacement racks start new records under the same container.
History that stays: replaced racks keep their full service history, and new racks start their own records under the same container.

What should a BESS emergency plan give the fire services?

For the emergency plan itself, the clearest guidance is international. The UK National Fire Chiefs Council (NFCC) says site operators should develop emergency plans and share them with the fire and rescue service. CFA in Australia asks for the plan to include contact information for 24/7/365 specialist technical support.

Keeping those contacts and the site drawings current is a maintenance task in its own right.

What FieldEx does about it

Plans on the site record: the emergency plan, site layout and contact list are attached to the site, visible to technicians on the phone.
Yearly review on schedule: the plan review runs as a recurring site job, raised ahead of its due date.
Emergency call-outs timed: service-level stages time how fast a technician is on the way and on site after an emergency call.

Customer story

TapEffect designs, builds and operates piped water systems for hard-to-reach rural communities in Cambodia, and runs its remote sites from a head office in Phnom Penh on FieldEx. Its story describes central visibility of stock levels at each site, transfers of equipment and fittings between sites, and job tasks and instructions set for each remote site, with a 25% increase in inventory management efficiency.

Read the TapEffect story

AMRTUR, a Southeast Asian oilfield services contractor, runs offshore and onshore maintenance on FieldEx, across harsh rig environments and strict HSSEQ standards. Its story describes maintenance jobs created automatically once a machine reaches 300 hours of use or 6 months, whichever comes first, QR request forms routed to the right team, and maintenance tracked for each component of complex equipment.

Read the AMRTUR story

Questions Malaysian BESS operators ask about FieldEx

Which maintenance software suits BESS operators in Malaysia?

One that holds every container and its components, runs the ST guideline's routine and periodic checks, sends competent persons and keeps the records accessible. FieldEx does all of this in one system with field service management, and onboards Malaysian teams in person. See our guide to CMMS software.

Can FieldEx link with our BMS, EMS or SCADA?

FieldEx can connect to any open system through REST APIs and has connectors for QuickBooks and Xero.

Can we schedule daily BESS checks for every container?

Yes. Inspections can recur daily on each container, each with its own checklist, and anything missed shows as overdue on the dashboard.

Can BESS technicians use the app in Bahasa Malaysia?

Yes. The mobile app runs in English, Bahasa Malaysia and Chinese, so each technician works in the language they prefer.

Can FieldEx remind us before the five-yearly competent person inspection?

Yes. The inspection runs as a certification with a five-year frequency and reminders by email, in the app or both.

Can we keep OEM warranty records for racks and inverters?

Yes. Warranty details sit on each asset and warranty periods on each spare part, and every repair and part fitted is recorded against the asset's serial number.

Can one O&M contractor run BESS sites for several owners?

Yes. Each owner is a customer with its own sites, assets, contracts and response targets, and each owner sees only its own records in the portal.

Can jobs be done at remote sites with no signal?

Yes. Jobs and tasks can be downloaded and worked offline, with check-in, check-out and travel synced later.

Can we track spares between warehouses, sites and vans?

Yes. Each warehouse and each technician's van stock is tracked, with transfers, reorder alerts and a history of every part used on each job.

How soon can our BESS sites go live on FieldEx?

Once we know your requirements and your data is ready, FieldEx can be implemented in as little as a week with standard features for small businesses. Larger setups and custom work take longer. There is no setup fee: setup, data upload and training come with the subscription, and FieldEx onboards customers in person in Malaysia as well as online. See FieldEx implementation in Malaysia.

How quickly can our storage sites be running on FieldEx?

Once we know your requirements and your data is ready, FieldEx can be implemented in as little as a week with standard features for small businesses. Larger setups and custom work take longer. Setup, data upload and training are included in the subscription, with no setup fee. Sites and assets can be uploaded. FieldEx helps with setup, and training is included. See FieldEx implementation.

Keep every BESS container's checks, repairs and records on one system

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