Qcells Q.HOME CORE vs Tesla Powerwall 3
A straight, side by side read on specs and warranties, with the honest caveats. Every figure is from the manufacturer datasheet; sources are at the bottom.
| Spec | Qcells Q.HOME CORE | Tesla Powerwall 3 |
|---|---|---|
| Chemistry | LFP | Not published |
| Usable capacity | up to 18 kWh | 13.5 kWh |
| Continuous power | 7.6 kW | 11.5 kW |
| Peak power | Not published | Not published |
| Round-trip efficiency | 95% | 89% |
| Warranty | battery 12 years at 90 percent DoD and 6,000 cycles; inverter and hub 10 to 12 years | 10 years |
| Backup scope | Whole-home capable | Whole-home capable |
| Inverter | Separate | Integrated |
What actually differs
- More usable capacity: the Qcells Q.HOME CORE offers up to 18 kWh vs 13.5 kWh (its largest single cabinet; the base config is smaller), so at that size it carries more of your home for longer per charge.
- More continuous power: the Tesla Powerwall 3 sustains 11.5 kW vs 7.6 kW, which matters for running big loads like an AC at once.
- Longer warranty term: the Qcells Q.HOME CORE is warranted 12 years vs 10, though always read the throughput or cycle cap too.
- Integration: the Tesla Powerwall 3 has a built-in inverter, while the Qcells Q.HOME CORE needs a separate one, which affects install cost and complexity.
- Efficiency is not apples to apples here: the Qcells Q.HOME CORE quotes 95% (battery module round trip (system cycle efficiency is lower)) and the Tesla Powerwall 3 quotes 89% (solar round trip (solar to battery to home); not a pure AC to AC figure), so do not read the raw numbers as a direct ranking.
Which one pays off is a numbers question.
Neither spec sheet tells you the payback in your home. That comes from your rate plan and incentives.
Run the Worth It calculator →Q.HOME CORE vs Powerwall 3 FAQ
Is the Qcells Q.HOME CORE or the Tesla Powerwall 3 better?
Neither is universally better. The Qcells Q.HOME CORE carries more usable capacity (up to 18 kWh vs 13.5 kWh), while the smaller unit can cost less and fit tighter spaces. The right pick depends on your home's loads, backup needs, and budget, not the brand on the box.
What is the difference in usable capacity between the Qcells Q.HOME CORE and the Tesla Powerwall 3?
The Qcells Q.HOME CORE offers up to 18 kWh and the Tesla Powerwall 3 offers 13.5 kWh of usable capacity.
Which has more continuous power, the Qcells Q.HOME CORE or the Tesla Powerwall 3?
The Tesla Powerwall 3 sustains 11.5 kW continuous vs 7.6 kW, which matters for running big loads like an air conditioner at once.
Which has the longer warranty, the Qcells Q.HOME CORE or the Tesla Powerwall 3?
The Qcells Q.HOME CORE is warranted 12 years vs 10 for the Tesla Powerwall 3. Read the throughput or cycle cap too, since that can limit coverage before the year count does.
Is the Qcells Q.HOME CORE or the Tesla Powerwall 3 cheaper?
Neither spec sheet tells you the installed cost or the payback in your home. That depends on your electricity rate plan and local incentives, so run the numbers for your address rather than comparing sticker prices.
Sources
Source: Qcells Q.HOME CORE datasheet (H3S/H7S), May 2025. Specs verified 2026-07-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.
Source: Tesla Powerwall 3 datasheet, 2026. Specs verified 2026-07-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.