Pylontech Fidus Battery
A low-voltage battery module of 5.12 kWh with IP65 protection, 8,000+ rated cycles and wall, floor or rack mounting.
- Best for outdoor installs
- Installed battery
- 5.12 kWh
- IP65
- Made by Pylontech.
- Energy: 5.12 kWh nominal and 4.97 kWh usable per module (51.2 V, model FB-L-5.12). The text of the product page says 4.8 kWh per unit; the specification table says 5.12 kWh.
- A battery only: it connects to an inverter. Pylontech says it works with 50+ popular inverter brands but does not name them on the page.
- Rated for 8,000+ cycles at 25 °C, 15-year design life, IP65 and anti-corrosion class C5-M.
- Pylontech's page gives no warranty period, so confirm the terms with your installer.
Not tested by us
We have not tested the Pylontech Fidus Battery. The figures on this page come from the sources listed at the end of the page, checked on 11 November 2026, and we do not show prices. "Best for" is based on what the maker says the product is designed for, not on our own tests.
Key figures
5.12 kWh
Nominal energy per module
IP65
Protection rating
8,000+
Cycles at 25 °C
Specifications
Last checked on 11 November 2026. The grey text under each name explains what the value means.
| Specification | Value |
|---|---|
| Storage | |
| CapacityHow much energy the battery stores. Bigger means longer runtime or more of your own solar power used later. | 5.12 kWh nominal per module (51.2 V; the page text says 4.8 kWh per unit) |
| Usable capacityThe part of the stored energy you can actually use. It is lower than the nominal capacity. | 4.97 kWh per module |
| Depth of dischargeHow much of the battery can be emptied without harming it. 90% means 10% is kept in reserve. | 97% in the specification table (the page text says 95%) |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | Not stated on the product page |
| Cycle lifeHow many full charge and discharge cycles the cells are rated for before they hold less than the stated share of their original capacity. | 8,000+ cycles at 25 °C; design life 15 years (end-of-life capacity not stated) |
| ExpansionExtra battery units that add storage to the same system. | Up to 6 strings, with up to 20 modules in one battery group (the page text says up to 576 kWh with parallel expansion) |
| Power | |
| Charge and discharge powerHow fast the battery can take in and give out energy. It sets how many devices it can serve at once. | Normal 100 A, maximum 100 A, peak 121 to 200 A for 15 seconds; Pylontech describes a continuous 1C rate and a 2C peak for 15 s (about 5.1 kW at 51.2 V nominal, our arithmetic) |
| Round-trip efficiencyThe share of the energy you put in that comes back out. The rest is lost as heat. | Not stated on the product page |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Not stated: the page mentions seamless grid switching, which depends on the inverter system |
| Solar | |
| Solar inverterTurns the DC power from solar panels into AC for the home. Built in means no separate solar inverter is needed. | None: this is the battery only. Pylontech says it is compatible with 50+ popular inverter brands and does not list them |
| Connection and housing | |
| Grid connectionThe supply type it is built for. Check it matches your home's supply. | Not applicable: the battery connects to an inverter (51.2 V nominal, low-voltage DC) |
| Dimensions (W × D × H)Check the space before you buy, including room around it for airflow and cables. | 638 × 137 × 370 mm |
| WeightMatters for lifting, wall mounting and moving it. | 45 kg |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP65, anti-corrosion class C5-M, protective class I; wall-, ground- or rack-mounted; altitude up to 4,000 m; humidity 5 to 95% without condensation |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | Charging -10 to 55 °C; discharging -10 to 55 °C; storage -20 to 60 °C in the table (the page text says -20 to 55 °C with cell-level heating) |
| Battery heatingA built-in heater that lets the battery charge in cold weather. | Cell-level heating is mentioned for extreme cold; no heater power or switch-on temperature is given |
| ConnectivityHow you monitor and control it, usually through an app. | RS485 and CAN; LED, and Bluetooth and Wi-Fi (optional) |
| CertificationsSafety and grid standards the maker says the product meets. | IEC 62619, IEC 63056, VDE 2510-50, IEC 62477-1, EMC, CE |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | Not stated on the product page |
Compatible with
What Pylontech says this product works with. Anything not listed here is not confirmed.
- Inverters
- Pylontech says the Fidus is compatible with 50+ popular inverter brands but does not name them on the product page. Ask your installer to confirm your exact inverter.
- Expansion
- Up to 6 strings, up to 20 modules per battery group.
- Mounting
- Wall-mounted, ground-mounted or rack-mounted.
Rules where you live
An installed battery normally needs a qualified electrician, and in many countries you must also tell your grid operator, especially if it can export. This is not a plug-in battery. Rules, incentives and tax treatment differ by country: see our country guides for what applies where you live.
Strengths and things to check
Strengths
- IP65 and C5-M corrosion class, for harsh sites
- 4.97 kWh usable per module
- 8,000+ rated cycles and a 15-year design life
- Wall, ground or rack mounting
- Cell-level heating mentioned for cold sites
Worth checking before you buy
- A battery only: you need a compatible inverter
- No warranty period or efficiency figure on the product page
- The page text and the specification table disagree on capacity
- Compatible inverters are not named
Change log
We record changes to this page here, so you can see when figures such as the warranty were last updated.
- 11 November 2026
- Page published. Figures are from Pylontech's Fidus Battery product page; the page text and its specification table differ on capacity (4.8 vs 5.12 kWh) and depth of discharge (95% vs 97%), and we show the table value. Warranty at publication: not stated. Pylontech also lists a Fidus Battery Plus and a Fidus Max; those are not covered here.
Where this information comes from
We have not tested this battery. Every figure above comes from Pylontech's Fidus Battery product page, last checked on 11 November 2026. The dimensions and weight are for one module. A value that the page does not state is shown as not stated.
We do not show prices, because they depend on the installer's quote.
- Manufacturer Pylontech Fidus Battery product page
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Common questions about Pylontech Fidus Battery
How much does the Pylontech Fidus Battery store?
Pylontech's specification table lists 5.12 kWh nominal and 4.97 kWh usable per module. The text above the table says 4.8 kWh per unit, so check the datasheet for your order.
Does it include an inverter?
No. It is a battery module only, so it needs a compatible inverter. Pylontech says it works with 50+ inverter brands but does not list them.
Can I install it outdoors?
Pylontech rates it IP65 with C5-M corrosion protection and describes it as designed for various outdoor installation scenarios. Follow the installation manual and your installer's advice.
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