Indevolt SolidFlex 3000 AC
An AC-coupled plug-in battery without solar inputs, using semi-solid LiFePO₄ cells and expansion batteries that can be mixed freely to reach 3,000 W.
- Best for adding storage
- Plug-in battery
- 1.8 kWh
- AC-coupled
- Made by Indevolt.
- Capacity: 1.8 kWh (1,792 Wh) in the main unit, expandable with SFA1800 (1,792 Wh) and SFA3600 (3,584 Wh) batteries.
- Solar: none. This is the AC version without MPPT, so it works with an existing solar inverter.
- Power: 3,000 W AC with two SFA1800 or one SFA3600, 2,000 W with one SFA1800, 1,000 W without expansion. 800 W in grid operation.
- 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 3000 AC. 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, expandable
3,000 W
AC output with expansion batteries
10,000
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 (1,792 Wh) in the main unit. Indevolt lists SFA3600 (3,584 Wh) and SFA1800 (1,792 Wh) expansion batteries. |
| 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. | 10,000 cycles |
| ExpansionExtra battery units that add storage to the same system. | Up to three systems in parallel. Expansion batteries of different sizes can be combined. |
| Power | |
| AC output, grid-connectedThe lower output allowed when it feeds power into the home's circuits or the grid. | 800 W in grid operation, up to 3,000 W with expansion batteries (3,000 W with two SFA1800 or one SFA3600, 2,000 W with one SFA1800, 1,000 W without). Maximum 13 A AC. |
| Backup outputA separate socket that keeps selected devices running when the grid is down. | Off-grid mode: 3,000 W with two SFA1800 or one SFA3600, 2,000 W with one SFA1800, 1,000 W without expansion batteries. Maximum 13 A AC. |
| AC charging inputHow fast it charges from a wall socket or the grid. | Up to 3,000 W with three SFA1800 or two SFA3600, 2,688 W with two SFA1800 or one SFA3600, 1,792 W with one SFA1800, 896 W without expansion batteries. Maximum 13 A AC. |
| Solar | |
| Solar inputHow much solar panel power it accepts. A higher figure fills the battery faster on a sunny day. | None. Indevolt describes this as the AC version without MPPT. |
| 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 and 5 GHz WLAN, LoRa, LAN and RS485 |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 10 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 3,000 W AC output with expansion batteries
- 10,000 cycles and a 10-year warranty
- Works with an existing solar inverter
- IP65 and -20 to 55 °C operating range
- Expansion batteries of different sizes can be combined
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 switchover time
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 SolidFlex 3000 AC is not yet Synergrid certified for Belgium; certification is in progress.
Where this information comes from
We have not tested the SolidFlex 3000 AC. 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, backup switchover time or maximum number of expansion batteries, so those are shown as not stated.
We do not show prices, because they change often and differ between sellers.
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Common questions about Indevolt SolidFlex 3000 AC
Can I use the Indevolt SolidFlex 3000 AC 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.
Does the SolidFlex 3000 AC have solar inputs?
No. Indevolt describes it as the AC version without MPPT, so it is coupled to an existing solar inverter.
How much power does the SolidFlex 3000 AC deliver?
Indevolt lists 800 W in grid operation and up to 3,000 W with two SFA1800 or one SFA3600 expansion battery, 2,000 W with one SFA1800 and 1,000 W without expansion batteries.
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