Growatt SPH 10000TL-HU-US
For grid-tied homes that want solar, battery backup and export in one outdoor box at a lower price than Sol-Ark or Fortress.
Amazon$2,599
The Growatt SPH 10000TL-HU-US is the better hybrid solar inverter overall, rated 4.5 to 4.4. The Growatt SPH 10000TL-HU-US leads on value. The Growatt SPH 10000TL-HU-US costs $600.99 less ($2,599 vs $3,199.99).
EG4 FlexBOSS18
For grid-tied homes that want net metering and whole-home backup at a lower price than the FlexBOSS21. Choose the 21 if you need more battery-only output or a third tracker.
Signature Solar $3,199.99$3,199.99
Prices were last checked October 23, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Growatt SPH 10000TL-HU-US for value ($260 per kW of continuous output vs $320 per kW of continuous output).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 120/240 V split-phase hybrid solar inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Growatt SPH 10000TL-HU-US | EG4 FlexBOSS18 |
|---|---|---|
| Overall rating | 4.5/5 | 4.4/5 |
| Value 30% | 88 $260 per kW of continuous output | 76 $320 per kW of continuous output |
| Solar input 20% | 75 15,000 W of panels, 525 V max, 3 MPPTs | 82 18,000 W of panels, 600 V max, 2 MPPTs |
| Efficiency 20% | 66 60 W idle | 68 94% peak efficiency, 60 W idle |
| Features 15% | 100 UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, generator input, battery communication | 95 UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, battery communication |
| Warranty 15% | 100 10-year warranty | 100 10-year warranty |
Specifications
| Growatt SPH 10000TL-HU-US | EG4 FlexBOSS18 | |
|---|---|---|
| Output | ||
| Output voltage | 120/240 V split-phase | 120/240 V split-phase |
| Continuous output | 10,000 W | 10,000 W |
| Surge | 15,000 W | 20,000 W |
| Peak efficiency | - | 94% |
| Max efficiency | 98.1% | - |
| CEC efficiency | 97% | 97% |
| Idle draw | 60 W | 60 W |
| Transfer time | 10 ms | 20 ms |
| Parallel units | Up to 6 units | Up to 16 units |
| Solar | ||
| Max PV power | 15,000 W | 18,000 W |
| Max PV voltage (Voc) | 525 V | 600 V |
| MPPT range | 150 to 450 V | 120 to 440 V |
| MPPT trackers | 3 | 2 |
| PV current per tracker | 22 A | 26 A |
| Runs without battery | Yes | - |
| Battery and grid | ||
| Battery voltage | 48 V | 48 V |
| Battery types | Lithium, lead-acid | Lithium, lead-acid |
| Max charge current | 200 A | 208 A |
| Battery communication | Yes | Yes |
| Grid sell-back | Yes | Yes |
| Generator input | Yes | - |
| UL 1741 | UL 1741 SB | UL 1741 SB |
| Build | ||
| App monitoring | Included | Included |
| Enclosure | IP65 (NEMA 4) | NEMA 4X |
| Dimensions | 457 x 874 x 256 mm | 30.43 x 22.28 x 11.22 in |
| Weight | 93.7 lb | 115 lb |
| Warranty | 10 years | 10 years |
| Released | 2024-05 | 2025-03 |