FELICITY FLA48500 48V 500AH 25KWH Battery (Grade A)

Felicity FLA48500 — 48V 500Ah 25kWh Deep Cycle Lithium Battery

The Felicity FLA48500 is a floor-mounted, large-format LiFePO₄ (Lithium Iron Phosphate) battery system rated at 25kWh of usable capacity at a nominal 51.2V. Designed for high-demand solar energy storage, the FLA48500 combines deep cycle durability with a scalable parallel architecture — making it a practical choice for installations that need sustained, reliable power delivery beyond what a single smaller battery can offer.

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LiFePO₄ Cell Chemistry and Prismatic Cell Construction

At the core of the FLA48500 is Lithium Iron Phosphate chemistry, which differs from NMC (Nickel Manganese Cobalt) alternatives in two critical ways: thermal stability and cycle longevity. LiFePO₄ cells do not enter thermal runaway as readily under high-temperature or overcharge conditions, which matters in warm climates like Kenya where ambient temperatures regularly exceed 30°C.

The FLA48500 uses prismatic cells rather than cylindrical cells. Prismatic cells offer higher energy density per unit volume, which contributes to the battery’s relatively compact footprint of 718 × 380 × 990 mm given its 25kWh capacity.

Furthermore, the chemistry supports a depth of discharge (DOD) of ≥95%, meaning nearly all of the rated 25kWh is accessible during normal operation. By comparison, lead-acid batteries are typically limited to 50% DOD before cycle life degrades significantly.

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Cycle Life and Operational Lifespan

The FLA48500 is rated for ≥6,000 charge-discharge cycles at 0.2C charging/discharging rate at 25°C with 80% DOD. To put this in practical terms:

• At one full cycle per day, 6,000 cycles represents approximately 16 years of daily operation.
• Even at two cycles per day — common in commercial applications with morning and evening peak loads — the battery’s service life extends beyond 8 years.

This cycle rating compares favourably to VRLA/AGM lead-acid batteries, which typically deliver 300–500 cycles under similar depth of discharge conditions.

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Battery Management System (BMS) and Safety Features

The FLA48500 integrates a built-in smart BMS that actively manages each cell group across the following protection parameters:

• Overcharge protection — cuts off charge at 57.6V maximum
• Over-discharge protection — recommended discharge cut-off at 48V
• Overcurrent protection — limits sustained current to ≤200A (recommended), with a 15-second maximum burst of 300A
• Short circuit protection — via integrated fuse
• Temperature-based charge inhibit — charging is restricted to 0°C–55°C to prevent lithium plating on cells during cold conditions

Additionally, the FLA48500 includes an aerosol fire extinguishing system — an internal passive safety layer that activates in abnormal thermal events, reducing fire propagation risk.

The unit carries an IP21 ingress protection rating, suitable for indoor, sheltered installations, and holds CE-EMC certification (EN 61000-6-3) and IEC 62619 safety certification for lithium battery systems.

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Communication Protocols: CAN and RS485

The FLA48500 supports dual digital communication interfaces — CAN bus and RS485. Both protocols allow the battery to exchange state-of-charge (SOC), state-of-health (SOH), voltage, current, and temperature data directly with compatible hybrid inverters and energy management systems (EMS).

This is significant in practice: rather than relying on voltage estimation alone, a CAN/RS485-connected inverter can make charge and discharge decisions based on real-time BMS data, improving both efficiency and battery protection. CAN is common in Pylontech-protocol-compatible inverters; RS485 is widely supported across Voltronic, Deye, and SolarEdge platforms, among others.

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Scalability: Parallel Expansion Up to 375kWh

One of the more useful architectural features of the FLA48500 is its support for up to 15 units in parallel connection, expanding total storage to 375kWh without requiring a separate battery controller. Each additional FLA48500 unit connects at the battery bus, and the BMS on each unit communicates with the inverter/EMS to balance load distribution.

This makes the FLA48500 particularly suitable for installations where capacity may need to grow incrementally alongside expanding solar panel arrays or rising energy consumption.

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Power Output Specifications

The FLA48500 delivers a recommended continuous output of ≤10,000W (10kW) with a maximum instantaneous output of 15,000W for short-duration peak loads. The recommended charge/discharge current ceiling of 200A continuous (300A burst over 15 seconds) allows it to pair with high-output hybrid inverters without becoming the limiting factor in the system.

At the 51.2V nominal voltage with 200A continuous discharge, the FLA48500 can sustain approximately 10.24kW of real power delivery — sufficient to run substantial mixed loads in commercial premises.

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Who Is This Suited For?

The FLA48500 is most appropriately matched to the following user profiles:

• Large residential homes (4+ bedrooms) with significant appliance loads — A single FLA48500 provides 25kWh of usable storage. At a typical household consumption of 8–12kWh per day, this covers 2–3 days of full autonomy without solar input, or substantially longer with adequate PV generation.
• Small-to-medium commercial premises — Retail shops, clinics, offices, and light manufacturing facilities with sustained loads of 5–10kW. The FLA48500’s 10kW continuous output and 15kW peak capacity match common inverter sizes in the 8–15kVA range.
• Agricultural and off-grid installations — Farms, water pumping stations, and remote facilities where grid connectivity is unreliable. The -20°C discharge temperature floor allows operation in cold highland environments, while the 55°C charge ceiling covers hot lowland conditions.
• Telecom and BTS backup sites — The RS485/CAN communication capability, combined with the IP21 enclosure and aerosol fire suppression, makes the FLA48500 compatible with monitored telecom infrastructure where remote BMS data logging is required.
• Installers and EPC contractors building scalable ESS — The 15-unit parallel capability (375kWh total) provides a growth path for clients whose energy demands increase over time, reducing the need to replace the battery bank entirely.
• Solar installers transitioning clients from lead-acid — The ≥95% DOD versus ~50% for lead-acid, combined with the 6,000-cycle rating, means the FLA48500 delivers substantially more lifetime energy throughput per installation.

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Technical Specifications

General

Electrical

Cycle Life

Operating Temperature

Communication & Protection

Scalability

Physical

Warranty