Pylontech · Home battery model
Pylontech Fidus Battery
Pylontech Fidus Battery is a current global 51.2 V family whose live documents cover IP65, IP20 and self-heating variants with different usable-energy and depth-of-discharge figures.
Specifications
| Specification | Value |
|---|---|
| Usable capacity (kWh) | 4.97 at 97% DoD for the base/P/PK schedule; 4.86 at 95% DoD for EU and EU-Pro |
| Nominal capacity (kWh) | 5.12 |
| IP rating | IP65 for P, EU and EU-Pro; IP20 for PK |
| Model codes | FB-L-5.12, FB-L-5.12-P, FB-L-5.12-PK, FB-L-5.12-EU and FB-L-5.12-EU-Pro in current hosted records |
| Nominal voltage (V) | 51.2 |
| Depth of discharge (%) | 97 or 95, depending on variant |
| Dimensions (mm) | 638 x 137 x 370 for P and PK; 630 x 170 x 363 for EU and EU-Pro |
| Weight (kg) | 45 |
| Maximum charge/discharge current (A) | 100 |
| Connectivity | RS485 and CAN |
Pylontech Fidus Battery is a low-voltage battery family in the manufacturer’s current global range. Its current records contain several variants and conflicting headline figures. Current UK new-supply and warranty terms are unconfirmed.
Variants in the current record
The base web table and current FB-L-5.12-P sheet state 5.12 kWh nominal, 4.97 kWh usable and 97% depth of discharge in an IP65 enclosure. FB-L-5.12-PK has the same energy schedule and dimensions but is IP20. The newer FB-L-5.12-EU and self-heating FB-L-5.12-EU-Pro sheet instead states 4.86 kWh usable, 95% depth of discharge, IP65 and dimensions of 630 by 170 by 363 mm.
The live introduction calls Fidus a 4.8 kWh unit at 95% depth of discharge, while its structured table states 5.12 kWh nominal, 4.97 kWh usable and 97%. These descriptions cannot all be assigned to one generic configuration. The model suffix and supplied document therefore decide the specification.
Electrical data
Nominal voltage is 51.2 V. The current variant sheets give 100 A maximum continuous charge and discharge current and 121 to 200 A for up to 15 seconds. The short peak is not a continuous rating, and the inverter or battery temperature may impose a lower limit.
CAN and RS485 are provided for inverter communications. A compatible 51.2 V voltage window is not enough by itself: the inverter needs the supported Pylontech protocol and firmware for FB-L-5.12.
Expansion
The system supports 20 units in one string or up to six groups, with a 19-unit-per-string limit in a multi-string installation. The 5 kWh to 583 kWh headline range reflects these larger architectures and depends on the required hub, protection and manufacturer design.
Enclosure and operating limits
The variants weigh 45 kg. The current sheets publish C5-M anti-corrosion classification and operating schedules that differ for the self-heating version. The structured web table gives a ten-year design life, while current downloadable sheets give 15 years and 8,000 cycles under stated test conditions. Neither design-life figure is a warranty duration.
Warranty boundary
UK product-specific warranty terms are unconfirmed.
Related entries
Brand
Reference type
Home battery model
Last reviewed
31 Jul 2026
Current status
UK new-supply status is unconfirmed.