Indevolt SolidFlex 2000 ECO
An AC-coupled plug-in battery without solar inputs, for adding day-to-night storage to an existing inverter, with semi-solid LiFePO₄ cells and mixable expansion batteries.
- Best for day-to-night storage
- Plug-in battery
- 1.8 kWh
- AC-coupled
- Made by Indevolt.
- Capacity: 1.8 kWh in the main unit, expandable to 22 kWh in one group and 66 kWh with three parallel groups.
- Solar: none. Indevolt says it has no MPPT input and is used with an existing inverter in AC-coupled operation.
- Power: up to 2,400 W AC with two SFA1800 or one SFA3600 expansion battery, 1,000 W without expansion.
- Rules: whether you can use it as a plug-in battery depends on your country.
Not tested by us
We have not tested the Indevolt SolidFlex 2000 ECO. 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
1.8 kWh
In the main unit, up to 66 kWh in total
2,400 W
AC output with expansion batteries
8,000
Cycles, semi-solid LiFePO₄
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. | 1.8 kWh, expandable to 22 kWh |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | Semi-solid lithium iron phosphate (LiFePO₄) |
| 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 |
| ExpansionExtra battery units that add storage to the same system. | Up to three groups in parallel, 66 kWh in total. PFA and SFA expansion batteries of any capacity can be combined. |
| Power | |
| AC outputThe power it can deliver through its sockets or inverter, in watts. | 2,400 W with two SFA1800 or one SFA3600, 2,000 W with one SFA1800, 1,000 W without expansion batteries |
| AC charging inputHow fast it charges from a wall socket or the grid. | 2,400 W with two SFA1800 or one SFA3600, 1,792 W with one SFA1800, 896 W without expansion batteries |
| Solar | |
| Solar inputHow much solar panel power it accepts. A higher figure fills the battery faster on a sunny day. | None. Indevolt says the ECO version has no MPPT input. |
| Operating voltageThe range of solar panel voltage the unit can use. Panels outside this range will not charge it properly. | 16 to 60 V DC |
| Solar inverterTurns the DC power from solar panels into AC for the home. Built in means no separate solar inverter is needed. | Indevolt lists app-integrated microinverters from Deye, FusionSolar, GoodWe, Growatt, SolarEdge, SolaX, Vay, Sunic, Solis, Sungrow and Solplanet. |
| Connection and housing | |
| Dimensions (W × D × H)Check the space before you buy, including room around it for airflow and cables. | 425 × 195 × 260 mm, as listed by Indevolt (axis order not stated) |
| WeightMatters for lifting, wall mounting and moving it. | 21.5 kg |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP65 |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | -20 to 55 °C |
| ConnectivityHow you monitor and control it, usually through an app. | Bluetooth, 2.4 GHz Wi-Fi, LoRa and optional 4G |
| CertificationsSafety and grid standards the maker says the product meets. | VDE-AR-N 4105, IEC 62619, EN 62109, IEC 61000-6-2/4, EN 50549, UN38.3 and RoHS 2.0 |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 10 years. Indevolt also lists a service life of 15 years. |
Compatible with
What Indevolt says this product works with. Anything not listed here is not confirmed.
- Smart meters
- Indevolt lists Shelly Pro 3EM, Shelly Pro EM, Shelly 3EM, Shelly Plug, Shelly Plug S Gen3, everHome EcoTracker IR, Solarman Meter, Solarman IR Reader, stromleser.one and HomeWizard P1.
- Existing solar inverters
- Indevolt lists app-integrated microinverters from Deye, FusionSolar, GoodWe, Growatt, SolarEdge, SolaX, Vay, Sunic, Solis, Sungrow and Solplanet.
Rules where you live
Rules for plug-in batteries differ by country, and we could not confirm a version or plug for Great Britain. In Great Britain, plug-in solar kits of up to 800 VA have been legal since 27 August 2026, but the rules exclude plug-in batteries.
Check the rules, incentives and tariffs for your own country in our country guides.
Strengths and things to check
Strengths
- Up to 2,400 W AC output with expansion batteries
- Expandable to 66 kWh in three parallel groups
- 8,000 cycles and a 10-year warranty
- Works with an existing solar inverter
- IP65 and -20 to 55 °C operating range
Worth checking before you buy
- No solar input: it only stores power from an existing system or the grid
- Without expansion batteries the AC output is limited to 1,000 W
- At 21.5 kg the main unit is heavy for a balcony
- Whether it counts as a plug-in product depends on your country: check the rules below
- The product page gives no efficiency, noise level or backup behaviour
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. Warranty at publication: 10 years (Indevolt Europe product page). Indevolt notes that the Synergrid certification for Belgium has been approved.
Where this information comes from
We have not tested the SolidFlex 2000 ECO. Every figure above comes from the specification list on Indevolt's Europe product page, last checked on 11 November 2026. The page gives no efficiency, noise level or backup switchover time, so those are shown as not stated.
We do not show prices, because they change often and differ between sellers.
Spotted an error?
Tell us through the contact form on our About Us page.
Common questions about Indevolt SolidFlex 2000 ECO
Can I use the Indevolt SolidFlex 2000 ECO as a plug-in battery in my country?
It depends on local rules. In Great Britain, plug-in solar kits up to 800 VA are legal since 27 August 2026 but the rules exclude plug-in batteries. Check our country guides.
What is the difference with the SolidFlex 2000?
Indevolt lists the ECO as the AC version with no MPPT input. The SolidFlex 2000 has four MPPT inputs for up to 2,400 W of solar panels.
How far can the SolidFlex 2000 ECO be expanded?
Indevolt lists 22 kWh in one group and 66 kWh with three parallel groups.
Related guides
How much could a battery save you?
Our calculator uses your own usage and tariff to estimate what a home battery could save, with conservative assumptions.