Head to head
Growatt HELIOS 3600 vs Bluetti Apex 300: the 240 V question
Side by side
| Spec | Bluetti Apex 300 | Growatt HELIOS 3600 |
|---|---|---|
| 240 V from one unit | Yes: 120/240 V from the 14-50R | No: 120 V only; 240 V needs two units and Growatt's Double Voltage Power Hub |
| Capacity | 2.76 kWh | 3.69 kWh |
| Continuous AC output | 3,840 W | 3,600 W (one unit); 7,200 W from two on the hub |
| 240 V output on battery | 16 A (3,840 W), per Bluetti's manual | 7,200 W from two units (Growatt) |
| Big outlets | NEMA 14-50R (50 A, 120/240 V) and TT-30R (30 A, 120 V) | TT-30 (30 A, 120 V); the hub adds two L14-30 and one 6-20 |
| Expands to | 19.35 kWh (with up to six B300K expansion batteries) | 18.09 kWh (up to 4 extra batteries (3.6 kWh each)) |
| Add-on battery | $1,099 each | $1,589 each, sold out when we checked |
| Max solar input | 2,400 W | 2,000 W |
| Rated cycles | 6,000 to 80% | 4,000 |
| UPS switchover | 0 ms in online UPS mode on some outlets, 20 ms otherwise (Bluetti) | 20 ms (Growatt also says 15 ms) |
| Weight | 83.78 lb | 99 lb |
| Warranty | Not stated | 5 years |
| Price on the maker's site* | $1,499 (November 14, 2026) | $1,599 one unit; $3,337 for two with the hub (November 14, 2026) |
*Prices and specifications are from each manufacturer's US website, checked . Prices change often, sometimes daily during sales; the seller's page is the final word. Cycle ratings are the maker's own figures, measured to different end points, so treat them as rough guides.
The 240 V question, in dollars
One Bluetti Apex 300
$1,499
120/240 V, 2.76 kWh, 3,840 W. At 240 V on battery the 14-50R gives 16 A; its 50 A rating applies only when grid or generator power passes through (Bluetti manual).
Two Growatt HELIOS 3600 units + hub
$3,337
120/240 V, 7.37 kWh, 7,200 W, with two L14-30 outlets on the hub. Two batteries to charge and move (99 lb each).
Either way, getting that 240 V into house circuits means an inlet box with an interlock, a transfer switch or the maker's panel, installed by a licensed electrician with a permit. See the four ways to connect a battery and the Apex 300 hookup guide.
Our price log
Prices we read on each maker's US store, one unit, oldest first. We record them on our own checks, so gaps mean we did not look that day.
| Bluetti Apex 300 | Growatt HELIOS 3600 | ||
|---|---|---|---|
| October 15, 2026 | $1,599 | November 14, 2026 | $1,599 |
| October 26, 2026 | $1,599 | ||
| November 6, 2026 | $1,499 | ||
| November 14, 2026 | $1,499 | ||
Buying one
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Frequently asked questions
Can one Growatt HELIOS 3600 give 240 V?
No. Growatt's own page says it supports 240 V whole-home power "when parallel two HELIOS 3600s", joined with its Double Voltage Power Hub ($139 on November 14, 2026), which gives 7,200 W with two L14-30 outlets. One unit is 120 V only.
Which is cheaper for 240 V, the HELIOS 3600 or the Apex 300?
The Apex 300: $1,499 for one unit on November 14, 2026, against $3,337 for Growatt's two-unit bundle with the hub on November 14, 2026. The Growatt pair gives far more: about 7.37 kWh and 7,200 W, against 2.76 kWh and 3,840 W.
Which holds more energy?
One HELIOS 3600 holds 3.69 kWh, one Apex 300 2.76 kWh. Fully expanded with each maker's batteries the Apex 300 reaches 19.35 kWh and the HELIOS 18.09 kWh, but Growatt's extra battery was sold out when we checked on November 14, 2026.
Can either one run a well pump?
A 240 V well pump needs 240 V: the Apex 300 from one unit (up to 3,840 W on battery at 240 V), the HELIOS only as a pair on the hub. Whether either starts your pump depends on its starting watts; check the pump's nameplate with our power outage backup calculator. Wiring a pump to either one goes through a transfer switch installed by a licensed electrician with a permit.
Have you tested them?
No. Every figure here comes from Growatt's and Bluetti's US stores and Bluetti's manual, on the dates shown.
What we checked
We have not tested either unit.Everything below comes from the makers' own manuals, support articles and store pages, and from safety agencies, read on the dates shown.
- Growatt HELIOS 3600 product page (read ): price, stock, two-unit bundle; "Support 240V whole-home power when parallel two HELIOS 3600s"
- Growatt Double Voltage Power Hub product page (read ): price; 7,200 W from two units; one 6-20 and two L14-30 outlets
- Bluetti Apex 300 product page (read ): price, stock, outlets
- Bluetti Apex 300 user manual V3.1 (PDF) (read ): 14-50R: 50 A bypass, 16 A at 240 V on battery
- Our Black Friday price log (src/data/deals.ts) (read ): earlier prices we recorded
Keep the house running in an outage
The four ways to connect a big battery to your home, what each costs, and which jobs need an electrician. Start with the home backup guide.
- Hookup pickerFive questions: how to connect a battery to your house, what size, and the parts
- Anker SOLIX F3800 Plus hookupInlet box, Anker's transfer switch or the Home Power Panel
- Bluetti Apex 300 hookupAT1, interlock or manual transfer switch, and the neutral question
- Power station for a well pumpStarting and running watts from the pump's nameplate
- Power station for a pellet stoveIgniter vs running watts and switchover time
- Bluetti Elite 200 V2 solar panelsWhich panels fit its input limits, series or parallel
Specifications and prices are copied from Growatt's and Bluetti's US websites on the dates shown and change often, especially during sales. Confirm them with the seller before you buy. Safety first: follow each maker's instructions and your local codes, use certified equipment, and have a licensed professional do any wiring. See our safety notes and disclaimer.