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Courses/Solar PV & Renewables/Battery Storage

lesson · 9min · Lesson 16 of 29

Battery chemistries: LFP vs NMC

Course syllabusCourse overview
01PV Physics & Panel Technology
  1. ReadPhotovoltaic effect: how a cell works
  2. ReadMonocrystalline vs polycrystalline vs thin-film
  3. ReadPanel specifications: Voc, Vmp, Isc, Imp
  4. ReadTemperature and irradiance effects
  5. quizPV physics quiz
02System Design & Sizing
  1. ReadSite survey: roof orientation, shading, pitch
  2. ReadString sizing: voltage and current matching
  3. ReadSeries vs parallel string configurations
  4. ReadYield estimation: kWh/kWp calculations
  5. exerciseSystem sizing design exercise
03Inverters
  1. ReadString inverters: topology and MPPT
  2. ReadMicroinverters and power optimisers
  3. ReadHybrid inverters for battery systems
  4. ReadInverter selection criteria
  5. quizInverter quiz
04Battery Storage
  1. ReadBattery chemistries: LFP vs NMC
  2. ReadBattery sizing for self-consumption
  3. ReadAC vs DC coupled systems
  4. ReadBattery safety and installation requirements
  5. exerciseBattery sizing exercise
05Grid Connection
  1. ReadG98: systems up to 3.68kW per phase
  2. ReadG99: larger systems, DNO approval
  3. ReadExport limitation and smart export tariffs
  4. ReadGeneration and export metering
  5. quizGrid connection quiz
06Installation & Commissioning
  1. ReadRoof mounting systems: rail and clamp
  2. ReadDC cable sizing and routing
  3. ReadCommissioning and functional testing
  4. quizFinal assessment
Lesson · 9min
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In this lesson

PurposeCore theoryWorked exampleKnowledge checkSources

In this lesson

PurposeCore theoryWorked exampleKnowledge checkSources
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ElectraCore lesson handout

Battery chemistries: LFP vs NMC

Solar Pv · Lesson 16 · Advanced

AdvancedReview: professional review pending

Purpose

Compare LFP and NMC battery systems through exact product safety, performance and application data rather than chemistry slogans.

Before you beginPV strings and I-V curves · AC/DC protection fundamentals

Learning objectives

  • Explain the architecture
  • Match electrical limits
  • Identify safety/protection boundaries
  • Use exact product evidence

LFP and NMC are lithium-ion cathode families. Typical differences in energy density and thermal behavior do not remove the need for product-level qualification and system controls.

BATTERY ENERGY AND SAFETY PATHSBATTERY ENERGY AND SAFETY PATHSMODULEMPPTcold Voc · hot Vmpirradiance · temperature · shading · exact product limits

Core theory

Compare usable energy, continuous/peak power, voltage/current, efficiency, cycle/calendar aging, temperature range, warranty throughput and expansion rules at system level.

A BMS monitors and limits cells but cannot make poor siting, incompatible power conversion, damaged modules or absent protection safe.

Thermal runaway propagation, off-gassing, fire response, enclosure, detection, separation and emergency information depend on the certified product and applicable fire assessment, not chemistry name alone.

Terms, symbols, and units
TermMeaningSymbolUnit
LFPLithium iron phosphate cathode chemistryNot applicableNot applicable
NMCNickel manganese cobalt oxide cathode chemistryNot applicableNot applicable
BMSBattery management systemNot applicableNot applicable
Worked exampleTwo batteries each have 10 kWh nominal energy; usable fractions are 90% and 80%.

Assumptions: All numerical data are supplied fictional design inputs.

  1. A: Usable A=10×0.90=9.0 kWh.
  2. B: Usable B=10×0.80=8.0 kWh.
  3. Limit: Power, efficiency, aging and safety still require product comparison.

Usable energies are 9.0 kWh and 8.0 kWh on the supplied basis.

Reasonableness check: The result is checked against the stated architecture and limits, not treated as universal product approval.

Common mistakes
  • Selecting from power rating alone
  • Assuming grid loss makes ordinary outputs backed up
  • Mixing nominal, usable and delivered battery energy

Where this appears in practice

PV and storage design coordinates conversion equipment, protection, controls, network requirements, fire safety and user operating modes.

SafetyPV DC and batteries remain energized independently of the public supply. Follow exact shutdown, isolation, verification and emergency procedures; never unplug loaded DC connectors.
Local code checkConfirm current BS 7671 Chapter 57/Section 712, PAS 63100 where applicable, DNO G98/G99/G100 process, exact ENA/Connect Direct status, fire risk assessment, manufacturer-approved battery/inverter combination and all protection/isolation/earthing requirements. Stored energy and illuminated PV remain hazardous after grid isolation.

Knowledge check

Does an LFP label by itself prove a safe installation location?

No. Product evidence, PAS 63100/fire assessment and site conditions govern.

Answer: No. Product evidence, PAS 63100/fire assessment and site conditions govern.

Practical exercise

Compare two supplied battery certificates/datasheets without assuming chemistry alone decides.

Summary

  • Architecture changes fault and energy paths
  • Every port has independent limits
  • Backup behavior must be deliberately designed

Sources and review

  • IEC 62109-3:2020: Safety of PV power converters: IEC; 2020; International
  • IEC 62619:2022: Safety requirements for secondary lithium cells and batteries: IEC; 2022; International
  • Amendment 4:2026 impact on BS 7671: IET; 2026; United Kingdom
  • ENA generator type-test register: Energy Networks Association; Current status must be checked in Connect Direct; Great Britain / Northern Ireland

Editorial review date: 2026-08-22. Professional electrical review is pending.

Educational material for learning and preliminary checks. Verify current local requirements and exact equipment instructions. This lesson does not replace competent professional work.

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