Deye SE-G5.1 Pro-B
A low-voltage 5.12 kWh LFP battery (51.2 V, 100 Ah) that can be expanded to 64 units in parallel, with a 5 or 10-year warranty depending on the installation site.
- Best for expandable 5 kWh units
- Installed battery
- 5.12 kWh
- 5 or 10-year warranty
- Made by Deye.
- Energy: 5.12 kWh nominal per unit at 51.2 V and 100 Ah; up to 64 units in parallel (327 kWh), of which 32 need no external setup.
- A battery only: it connects to a compatible inverter. Deye's page does not list which inverters.
- Warranty of 5 or 10 years depending on where the battery system is finally installed; refer to Deye's warranty policy.
- IP20 enclosure, so for indoor installation; operating range -20 to 55 °C with natural cooling. The SE-G5.1 Pro-B is listed for Europe, North America, Australia, Africa and Latin America.
Not tested by us
We have not tested the Deye SE-G5.1 Pro-B. 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 unit
64 units
Maximum in parallel (327 kWh)
5 / 10 years
Warranty, by installation site
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 energy (51.2 V, 100 Ah) |
| Usable capacityThe part of the stored energy you can actually use. It is lower than the nominal capacity. | Not stated separately |
| Depth of dischargeHow much of the battery can be emptied without harming it. 90% means 10% is kept in reserve. | Not stated in the sources we read |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | 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. | Not stated in the sources we read |
| ExpansionExtra battery units that add storage to the same system. | Up to 64 units in parallel (327 kWh); up to 32 units without external setup |
| 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. | Not stated in the sources we read (operating voltage 43.2 to 57.6 V; Deye mentions high discharge capability without a number) |
| Round-trip efficiencyThe share of the energy you put in that comes back out. The rest is lost as heat. | Not stated in the sources we read |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Not stated: backup comes from the inverter |
| 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 |
| 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 (nominal 51.2 V DC) |
| Dimensions (W × H × D)Width, height and depth of the unit, so you can check that it fits. | 440 × 133 × 540 mm |
| WeightMatters for lifting, wall mounting and moving it. | About 45 kg |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP20 |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | -20 to 55 °C, natural cooling |
| ConnectivityHow you monitor and control it, usually through an app. | Auto-battery networking, remote monitoring and USB firmware updates (communication interfaces not listed) |
| CertificationsSafety and grid standards the maker says the product meets. | Not stated in the sources we read |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 5 years or 10 years: Deye says the period depends on the final installation site of the battery system and refers to its warranty policy, which we have not read |
Compatible with
What Deye says this product works with. Anything not listed here is not confirmed.
- Inverters
- Deye's page does not list compatible inverters. Ask your installer to confirm the combination.
- Expansion
- Up to 64 units in parallel; up to 32 without external setup.
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
- Expandable to 64 units (327 kWh)
- Slim 133 mm unit height
- LFP chemistry, cobalt-free according to Deye
- Listed for Europe and several other regions
Worth checking before you buy
- A battery only: you need a compatible inverter
- IP20, so for indoor installation
- No cycle rating, charge power or efficiency on Deye's page
- The warranty is 5 or 10 years depending on the installation site
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: 5 or 10 years depending on the installation site. Figures are from Deye's product page only; no datasheet was read. Deye also sells newer SE-F5 low-voltage models, which this page does not cover.
Where this information comes from
We have not tested this battery. Every figure above comes from the Deye product page for the SE-G5.1 Pro-B, last checked on 11 November 2026. 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 Deye SE-G5.1 Pro-B product page
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Common questions about Deye SE-G5.1 Pro-B
How much does the Deye SE-G5.1 Pro-B store?
Deye lists 5.12 kWh nominal energy per unit (51.2 V, 100 Ah). Up to 64 units can be connected in parallel for 327 kWh; up to 32 need no external setup.
Does it include an inverter?
No. It is a low-voltage battery only. Deye's page does not name the inverters it works with, so ask your installer to confirm.
How long is the warranty?
Deye states 5 years or 10 years, depending on the final installation site of the battery system, and refers to its warranty policy for the details.
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