Battery Storage
GoodWe Lynx D G2 Series
GoodWe GW5.1-BAT-D-G20 / GW6.0-BAT-D-G20 / GW8.3-BAT-D-G21 / GW9.0-BAT-D-G20
Device Comparison
GoodWe Lynx D G2 vs Lynx Home U vs SMA Home Storage vs SAJ B2 HV
A modular home battery comparison for buyers choosing between inverter-aligned storage stacks from major solar brands.
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Which To Choose
Start with the practical fit, then read the table.
GoodWe Lynx D G2 Series
Best fit when future expansion and 10-year warranty coverage.
GoodWe Lynx Home U Series
Best fit when about 4.8 kWh usable storage, future expansion, and 10-year warranty coverage.
SMA Home Storage
Best fit when about 3.28 kWh usable storage, backup needs like system-dependent backup and black-start support with compatible SMA hybrid inverter., and future expansion.
SAJ B2 HV Series
Best fit when about 4.5 kWh usable storage, backup needs like backup support depends on the paired SAJ H2 / H2 HV hybrid inverter; B2 HV is the battery stack, while outage backup / UPS behavior is provided by the compatible inverter system., and future expansion.
Use this comparison when the battery choice is being made alongside a compatible inverter ecosystem and the shortlist includes brand-native modular storage options.
At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
GoodWe Lynx D G2 Series
- Chemistry
- LFP (LiFePO4)
- Expansion
- Up to 12 battery packs in parallel, with multi-cluster expansion and mixed-capacity pack support within the Lynx D G2 series.
- Warranty
- 10 years
- Price
- Installer-quoted
GoodWe Lynx Home U Series
- Usable capacity
- 4.8 kWh
- Nominal capacity
- 5.4 kWh
- Chemistry
- Lithium iron phosphate (LiFePO4)
- Charge/discharge
- 2.88 kW
SMA Home Storage
- Usable capacity
- 3.28 kWh
- Chemistry
- Lithium Iron Phosphate (LiFePO4)
- Expansion
- 3.28 kWh per module; stack options from 6.56 to 16.40 kWh depending on compatible SMA hybrid inverter and module count.
- Warranty
- 10 years
SAJ B2 HV Series
- Usable capacity
- 4.5 kWh
- Nominal capacity
- 5 kWh
- Chemistry
- LFP (LiFePO4)
- Expansion
- Modular one-stack family from 5.0 kWh to 25.0 kWh, depending on the number of battery modules
Before You Decide
Checks that matter before price.
- Separate bill-shifting size from backup size before comparing models.
- Check usable capacity, discharge power, and expansion path together.
- Confirm whether the battery fits your existing inverter or needs a new system stack.
- Compare warranty terms and installer support, not only kWh per dollar.
| Install fit | ||||
|---|---|---|---|---|
| Phase support | Single-phase and three-phase compatible GoodWe storage systems | Depends on the compatible inverter and home electrical system. | Compatible with single-phase and three-phase SMA hybrid storage systems depending on inverter model | Depends on paired SAJ hybrid inverter; commonly used in residential single-phase systems |
| Installation | Floor-stacked, wall-mounted, or grounded high-voltage residential battery pack. | Stackable wall-mounted or floor-mounted low-voltage battery for indoor or outdoor residential installation | Floor, wall, back-to-back, or outdoor IP65 modular battery installation by a qualified installer. | Wall-mounted or ground-mounted modular high-voltage residential battery |
| Measurement | High-voltage LFP battery storage for self-consumption, energy trading, and off-grid-capable GoodWe systems. | Battery storage system with integrated BMS-managed DC energy storage | Modular LiFePO4 home battery storage for compatible SMA hybrid inverter systems. | High-voltage residential battery storage family for solar self-consumption and compatible backup-ready hybrid systems |
| Max current | Unknown | Unknown | 36 A | 50 A |
| Inverter fit | ||||
| Backup support | Unknown | Unknown | System-dependent backup and black-start support with compatible SMA hybrid inverter. | Backup support depends on the paired SAJ H2 / H2 HV hybrid inverter; B2 HV is the battery stack, while outage backup / UPS behavior is provided by the compatible inverter system. |
| Battery fit | ||||
| Nominal capacity | Unknown | 5.4 kWh | Unknown | 5 kWh |
| Usable capacity | Unknown | 4.8 kWh | 3.28 kWh | 4.5 kWh |
| Chemistry | LFP (LiFePO4) | Lithium iron phosphate (LiFePO4) | Lithium Iron Phosphate (LiFePO4) | LFP (LiFePO4) |
| Charge/discharge power | Unknown | 2.88 kW | Unknown | Unknown |
| Warranty | 10 years | 10 years | 10 years | 10 years |
| Expansion | Up to 12 battery packs in parallel, with multi-cluster expansion and mixed-capacity pack support within the Lynx D G2 series. | 5.4-32.4 kWh nominal / 4.8-28.8 kWh usable | 3.28 kWh per module; stack options from 6.56 to 16.40 kWh depending on compatible SMA hybrid inverter and module count. | Modular one-stack family from 5.0 kWh to 25.0 kWh, depending on the number of battery modules |
| Monitoring | ||||
| Protocol | CAN / RS485 | CAN | SMA battery interface / RJ45 | CAN |
| Local API | No | No | No | No |
| Cloud dependency | Local CAN/CAN-RS485 battery communication; SEMS monitoring and remote diagnostics are optional GoodWe system services. | GoodWe SEMS is typically used for remote monitoring and system management. | Battery operation uses compatible SMA hybrid inverter hardware; Sunny Portal, SMA Energy app, and SMA Smart Connected support monitoring and service workflows. | Usually monitored through the paired SAJ inverter and eSolarCloud ecosystem. |
| Home Assistant | No | No | No | No |
| Solar fit | ||||
| Solar import/export | Yes | Yes | Yes | Yes |
| Buying context | ||||
| Price range | Installer-quoted | Installer-quoted | Installer-quoted | Installer supplied; varies by battery stack size and region |
| Availability | Global GoodWe battery range with region-specific availability and warranty terms. | North America | Europe-focused SMA Home Storage availability through SMA partners; rollout and installer access vary by market. | Global / region-specific SAJ residential battery availability varies |
| Source check | ||||
| Last verified | Jun 3, 2026 | May 31, 2026 | Jun 18, 2026 | Jun 21, 2026 |
| Product page | Official page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs | Official docs |
Verdict
Choose the battery that best matches the inverter family and installer ecosystem you plan to use, because compatibility and support matter more here than isolated spec-sheet comparisons.
FAQ
Common decision questions.
Which battery storage should I choose?
Choose the option that matches your installation constraints and data path first. For 4 battery storage options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.