Indevolt BK1600 Ultra
(3 reviews)
30% lighter and more compact than comparable balcony batteries, with EPS backup power switching in 10 ms and wireless expansion up to 4.9 kWh.
Characteristics
- Capacity: 1636 Wh LiFePO4, expandable to 4.9 kWh
- Solar: 2 x 600 W built-in MPPT, 1200 W max
- Format: 300 x 215 x 250 mm, 16 kg, IP54
- EPS backup power in 10 ms, missing on the standard BK1600
Detailed overview: Compact Indevolt solar battery with backup power, 1636 Wh
The Indevolt BK1600 Ultra is a compact plug and play solar battery, built for a balcony, a small terrace, or any space where room is tight. At 300 x 215 x 250 mm for 16 kg, it claims roughly 30% more compact than comparable balcony batteries, while keeping a usable capacity of 1636 Wh in LiFePO4 cells.
It packs 2 built-in MPPT trackers rated at 600 W each, for up to 1200 W of solar input, letting you connect new panels with no extra inverter. It also stays compatible with an already installed microinverter through AC coupling, with no change to the existing setup.
The key difference from the standard BK1600 is its EPS (Emergency Power Supply) function: during a power cut, the BK1600 Ultra switches to battery automatically in about 10 milliseconds, keeping the household's essential appliances running. The standard BK1600 lacks this automatic switchover and is limited to manual off-grid use.
Capacity extends by pairing up to 3 BK1600 Ultra units (or a mix with standard BK1600 units) wirelessly in parallel, reaching 4.9 kWh of storage and up to 3600 W of combined output power. The IP54-rated enclosure operates from -20 °C to 45 °C, with a stated noise level under 30 dB. Control runs through the Indevolt app (Bluetooth, 2.4 GHz Wi-Fi, 4G), with local control independent of the cloud and stated compatibility with third-party meters such as Shelly, HomeWizard P1 or Solarman. It is backed by a 10-year manufacturer warranty for a stated 15-year service life.
Full specifications
Detailed characteristics
Battery
| Technology?Battery chemistry; LiFePO4 lasts far longer and can be fully discharged, gel/AGM is maintenance-free and cheaper. | LiFePO4 (lithium) |
|---|---|
| Energy?Stored energy in watt-hours. | 1636 Wh |
| Cycle life?Rated number of charge/discharge cycles, at the stated depth of discharge. | 6000 cycles |
| Expandable up to?Maximum capacity reachable with add-on modules. | 4908 Wh |
Power and protection
| Output power?Maximum power delivered (for storages with a 230 V output). | 1200 W |
|---|---|
| Built-in BMS?Battery management system protecting against overcharge, deep discharge, short-circuit and overcurrent (lithium batteries). | Yes |
| Low-temperature protection / heating?Cuts off or heats charging in cold weather to protect the lithium cells. | Yes |
Solar section
| MPPT controllers?Number of built-in MPPT solar controllers (lets you connect panels facing different directions). | 2 |
|---|---|
| Max solar input?Maximum connectable PV power. | 1200 W |
| Micro-inverter?Power of the inverter that feeds energy back into the home grid. | 1200 W |
Connectivity
| Bluetooth?Monitoring and settings via an app over Bluetooth. | Yes |
|---|---|
| Wi-Fi?Remote control and updates over Wi-Fi. | Yes |
Durability and format
| Ingress protection?Water and dust resistance (IP rating). | IP54 |
|---|---|
| Maintenance-free?Sealed battery needing no water top-up (gel / AGM). | Yes |
| Weight?Weight of the battery. | 16 kg |
| Dimensions (L × W × H)?Length × width × height, in millimetres. | 300 × 215 × 250 mm |
Availability and warranty
| Market launch?Date the model first became available on the European market. Useful to place its generation: technology moves fast in this segment, and a device several years old may be at the end of its commercial life. | September 2025 |
|---|---|
| Warranty?Length of the manufacturer's warranty. | 10 years |
Comparison
How does the Indevolt BK1600 Ultra compare with other compact solar batteries, for searches like "balcony battery with backup power"? Here is how it stacks up against two references already in the catalogue: the Growatt NOAH 2000, a higher-capacity balcony battery without built-in MPPT, and its bigger sibling the Indevolt SolidFlex 2000, more powerful but pricier.
| Criterion | BK1600 Ultra | Growatt NOAH 2000 | Indevolt SolidFlex 2000 |
|---|---|---|---|
| Capacity | 1636 Wh, expandable to 4.9 kWh | 2048 Wh, expandable to 8192 Wh | 1792 Wh, expandable to 66 kWh |
| Built-in MPPT | Yes, 2 x 600 W (1200 W) | No, separate microinverter required | Yes, 4 x 600 W (2400 W) |
| Backup power (EPS) | Yes, 10 ms switchover | No | Yes, 10 ms switchover |
| Weight | 16 kg | Not disclosed | 21.5 kg |
| Observed price | €499 | ≈ €389 | €799 |
In short, the BK1600 Ultra positions itself as a lightweight, compact compromise between the NOAH 2000, cheaper but without MPPT or automatic backup, and its bigger sibling the SolidFlex 2000, more powerful and higher-capacity but also heavier and pricier. For a small balcony or a first installation with backup power included, it is a coherent entry point from Indevolt.
Related video
Video: Je teste la batterie domestiqur Indevolt BK1600 Ultra 🔋 Guide d'installation autoconsommation ☀️ - Published on 28/11/2025
Our tester's review: Julien De Jurquet
The BK1600 Ultra plays the compact card without cutting corners: its 16 kg and case the size of a large suitcase make it easy to fit on a tight balcony, and its two built-in MPPT inputs let you connect new panels directly without a third-party inverter. The EPS function, which switches to battery in 10 ms during an outage, is what really sets it apart from the base BK1600 for just €100 more. Control through the app is simple and clear, with real-time production tracking, though one review found on the manufacturer's own site notes the displayed savings figures are not always easy to follow. Its compatibility with Shelly and HomeWizard meters makes it a popular pick in the home-automation community. Its one real limit: 1200 W of output on a single unit, best reserved for everyday appliances rather than heavy loads. For a small household wanting backup power without blowing the budget, it is a solid choice.
Frequently asked questions: Compact Indevolt solar battery with backup power, 1636 Wh
Both share the same 1636 Wh capacity and the same 2 MPPT inputs, but only the BK1600 Ultra includes the EPS function, which switches to battery automatically in 10 ms during a power cut. The standard BK1600 does not have this automatic switchover.
Yes, it packs 2 built-in MPPT trackers (1200 W total), so it can accept new solar panels without a third-party inverter. It also stays compatible with AC coupling to an already installed microinverter.
Yes, up to 3 units (BK1600 Ultra or a mix with standard BK1600) can be paired wirelessly in parallel, reaching 4.9 kWh of total capacity and up to 3600 W of combined output power.
Yes, the manufacturer states compatibility with several third-party meters including Shelly Pro 3EM, Shelly 3EM, HomeWizard P1 and Solarman, for local control independent of the cloud.
Yes, its enclosure is IP54-rated and operates from -20 °C to 45 °C, which suits installation on a balcony or terrace, away from prolonged direct exposure.
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Published on 24/08/2026