Battery Energy Storage Systems (BESS)

Independent third‑party field evaluations for Battery Energy Storage Systems (BESS) that assess safety and code compliance to support regulatory approval and AHJ acceptance.

NFPA Global Solutions provides independent third-party field evaluations for Battery Energy Storage Systems (BESS). Field evaluations are conducted to assess electrical safety, construction, and compliance with applicable electrical and fire codes, referenced standards, and acceptance criteria.

Battery Energy Storage Systems are increasingly installed in commercial, industrial, and infrastructure applications and often consist of integrated electrical, control, and energy management components. Our evaluations help demonstrate compliance when systems are custom built, modified, or not listed by a nationally recognized testing laboratory, supporting regulatory review and acceptance by Authorities Having Jurisdiction (AHJs).

Why BESS Compliance Matters

Battery Energy Storage Systems are subject to rigorous electrical and fire safety requirements due to high energy density, system complexity, and site-specific installation conditions. Systems that are custom engineered, modified after manufacturing, or assembled from multiple components often fall outside traditional certification pathways, creating additional scrutiny during inspection and approval.

When required documentation or third-party compliance evidence is incomplete, unclear, or not aligned with how the system is installed and operated, approvals by Authorities Having Jurisdiction can be delayed or denied.

Issues identified during inspection or commissioning can result in corrective modifications, additional testing, restricted operation, or project delays. Clear, code aligned field evaluation data helps reduce uncertainty during regulatory review and supports more consistent acceptance across jurisdictions.

BESS Field Evaluation Overview

Battery Energy Storage System field evaluations are performed as one time conformity assessments on installed systems to support regulatory review and acceptance by Authorities Having Jurisdiction. Evaluations focus on whether the system conforms to applicable electrical and fire codes, referenced standards, and acceptance criteria.

Field evaluations are typically used when Battery Energy Storage Systems have not undergone traditional product certification, when components are integrated into a site-specific configuration, or when modifications or installation conditions differ from the original certification scope. These evaluations provide AHJs with independent, third-party information to support approval decisions.

These services are commonly applied to Battery Energy Storage Systems intended for permanent installation in commercial, industrial, utility, and infrastructure environments.

Key Capabilities Include:

  • Conformity assessment of electrical construction and system safety features relative to applicable codes and standards
  • Evaluation based on installed configuration, operating conditions, and intended use
  • Review of technical documentation to support regulatory and AHJ review
  • Documentation to support field evaluation reports, regulatory approval, and acceptance

How BESS Field Evaluations Reduce Risk and Support Compliance

Battery Energy Storage System field evaluations provide Authorities Having Jurisdiction with clear, documented information to support review and acceptance of installed systems against applicable electrical and fire safety requirements. These results support more informed decision making and help streamline the approval process.

By identifying non-conformities and installation considerations early, field evaluations help limit corrective work, re-inspection, and unplanned delays during commissioning. This supports more predictable project timelines and reduces disruption during system startups.

For manufacturers, system integrators, and owners, field evaluations provide a practical compliance pathway when traditional certification is not feasible. Documented evaluation data helps support consistent acceptance across jurisdictions and provides confidence that installed systems meet applicable safety expectations.

Battery Energy Storage System Accreditations

ISO/IEC 17020 Accredited Field Evaluation Body

  • ANSI National Accreditation Board (ANAB): AI-3355

Inspection Body for SPE 1000 Field Evaluations

  • Standards Council of Canada (SCC)

Relevant Battery Energy Storage System Standards and Test Methods

  • NFPA 70, National Electrical Code
  • NFPA 855, Standard for the Installation of Stationary Energy Storage Systems
  • NFPA 790, Standard for Competency of Third Party Field Evaluation Bodies
  • NFPA 791, Recommended Practice and Procedures for Unlabeled Electrical Equipment Evaluation
  • UL 9540, Energy Storage Systems and Equipment

BESS codes and standards are actively evolving. Applicable editions, versions, and local amendments are determined based on the requirements of the jurisdiction where the system is installed. Contact our team for current information on applicable BESS requirements.

What types of systems are evaluated?

Battery Energy Storage System field evaluations are commonly performed on stationary energy storage installations, including integrated battery systems, power conversion equipment, control panels, and associated electrical assemblies intended for permanent installation.

When is a field evaluation typically required?

Field evaluations are typically required when Battery Energy Storage Systems have not undergone traditional product certification, have been modified after manufacture, or when requested by an Authority Having Jurisdiction during inspection or review.

Note: FAQ responses reflect the general knowledge and experience of our technical team and are provided for informational purposes only. They do not constitute legal advice.

Does a field evaluation replace product certification or listing?

No. A field evaluation is a one-time conformity assessment for a specific system and installation. It does not replace full product certification or listing for mass produced products.

Note: FAQ responses reflect the general knowledge and experience of our technical team and are provided for informational purposes only. They do not constitute legal advice.

Will a field evaluation be accepted by the Authority Having Jurisdiction?

Field evaluations performed by an accredited Field Evaluation Body are commonly accepted by Authorities Having Jurisdiction when conducted to applicable codes, standards, and jurisdictional requirements. However, acceptance is at the discretion of the AHJ and may be subject to additional local requirements. Customers should confirm acceptance criteria with their AHJ prior to engaging field evaluation services.

Note: FAQ responses reflect the general knowledge and experience of our technical team and are provided for informational purposes only. They do not constitute legal advice.

What is the process for a field evaluation?

The process typically includes the following steps:

  • Engage a Field Evaluation Body: The customer engages an accredited Field Evaluation Body, such as NFPA Global Solutions, to provide conformity assessment services acceptable to the Authority Having Jurisdiction.
  • Discuss scope and requirements: NFPA Global Solutions works with the customer and, where appropriate, the AHJ to define evaluation scope and applicable requirements.
  • Conduct the evaluation: The field evaluation is performed, and a field evaluation label may be applied if all applicable requirements are met. Identified non-conformities must be addressed before final acceptance.
  • Receive a report: A documented field evaluation report is issued to support regulatory review and AHJ decision making.

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Disclaimer: BESS field evaluations assess system-level electrical and fire code conformity based on conditions observed and information available at the time of the evaluation. Battery energy storage systems involve dynamic electrochemical processes, including potential thermal runaway, that cannot be fully assessed through a one-time field evaluation. Ongoing system safety depends on battery management system functionality, thermal management, environmental controls, maintenance, monitoring, and operational practices, all of which are the responsibility of the system owner and operator.

Fire code evaluation focuses on compliance with applicable provisions of NFPA 855 and related fire code requirements as they apply to the installed BESS configuration. The field evaluation does not constitute a comprehensive fire protection engineering assessment, fire risk analysis, or fire suppression system design review.

For more information, please review our Legal Notices.

Why NFPA Global Solutions Battery Energy Storage System Field Evaluations

Our field evaluation team brings decades of experience evaluating complex electrical systems, including growing expertise supporting BESS installations as this technology category continues to expand.

NFPA Global Solutions is a wholly owned subsidiary of the National Fire Protection Association, and expands upon NFPA’s leadership in fire, electrical, and life safety codes and standards. Our approach emphasizes independent third-party conformity assessment, technical accuracy, and clear documentation that may be used to support regulatory review and acceptance by Authorities Having Jurisdiction.

NFPA Global Solutions operates independently from NFPA's codes and standards development activities. Field evaluations are conducted based on the published requirements of applicable codes and standards, consistent with the processes used by all accredited field evaluation bodies.

Connect With Our Team

Connect with a specialist to discuss your Battery Energy Storage System, applicable code and field evaluation requirements, and how evaluation data can be used to support regulatory review and acceptance by Authorities Having Jurisdiction. Our team will help identify appropriate evaluation pathways based on your system design, installation, and intended application.