Generac GB1000 vs Vtoman FlashSpeed 1000
What is the difference?
The Generac GB1000 has 1.6 kW of power, 3.2 kW peak, a 1.09 kWh battery. The Vtoman FlashSpeed 1000 has 1 kW of power, 2 kW peak, a 828 Wh battery.
The Generac GB1000 uses a lithium-ion (NMC) battery, the Vtoman FlashSpeed 1000 a LiFePO4 one. LiFePO4 generally lasts more charge cycles, so the Vtoman FlashSpeed 1000 should last longer.
The Generac GB1000 is rated for 800 cycles, the Vtoman FlashSpeed 1000 is rated for 3000 cycles.
The Generac GB1000 takes up to 468 W from solar, the Vtoman FlashSpeed 1000 takes up to 300 W from solar. The Generac GB1000 charges faster from panels.
The Generac GB1000 has a 3-year warranty, the Vtoman FlashSpeed 1000 has a 5-year warranty.
The Vtoman FlashSpeed 1000 can add extra batteries.
Specs side by side
| Generac GB1000 | Vtoman FlashSpeed 1000 | |
|---|---|---|
| Capacity (Wh) | 1086 | 828 |
| Continuous (W) | 1600 | 1000 |
| Peak (W) | 3200 | 2000 |
| Solar input (W) | 468 | 300 |
| Chemistry | NMC | LiFePO4 |
| Cycles | 800 | 3000 |
| Expandable | — | yes |
| Weight (lb) | 29 | — |
| Warranty (yr) | 3 | 5 |
| Fridge run time | 20.5 h | 15.6 h |
| CPAP run time | 24.6 h | 18.7 h |
| Wi-Fi router run time | 71.7 h | 54.6 h |
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Specs as read from manufacturer pages on 2026-10-28 / 2026-10-26. Specs one maker does not list are left out of the comparison. Run times are for that appliance alone with a typical duty cycle, after inverter and depth-of-discharge losses. Sponsored links; we may earn a commission.
Common questions
Which has more capacity, Generac GB1000 or Vtoman FlashSpeed 1000?
The Generac GB1000. More capacity: 1086 Wh vs 828 Wh.
Which has the longer warranty, Generac GB1000 or Vtoman FlashSpeed 1000?
The Vtoman FlashSpeed 1000. Longer warranty: 5 years vs 3 years.
Which charges faster from solar, Generac GB1000 or Vtoman FlashSpeed 1000?
The Generac GB1000. Faster solar charging: 468 W input vs 300 W input.
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Compare other models → · All Generac models · All Vtoman models