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Growatt HELIOS 3600 sizing guide
Whole-home-class unit, expandable to 36 kWh; Watt+ mode boosts to 4,500 W of loads. Here's exactly what it runs, how long, and which outages it covers — computed, not marketed.
Simultaneous 120V/240V + XT60/Anderson solar input for fast combined charging · 99 lb · 16 outlets of mixed types · expandable with add-on batteries.
What the HELIOS 3600 runs — and for how long
| Appliance | Running | Runs it? | Approx. runtime |
|---|---|---|---|
| Refrigerator (modern) | 150 W (1,200 W surge) | yes | ~63 h |
| Chest Freezer | 100 W (1,000 W surge) | yes | ~95 h |
| CPAP Machine (no humidifier) | 40 W | yes | ~83 h |
| CPAP with Heated Humidifier | 60 W (95 W surge) | yes | ~69 h |
| Oxygen Concentrator | 350 W (600 W surge) | yes | ~9.5 h |
| Space Heater (1500 W) | 1,500 W | yes | ~2.2 h |
| Window AC (8,000 BTU) | 715 W (1,250 W surge) | yes | ~6.6 h |
| Window AC (12,000 BTU) | 1,100 W (1,800 W surge) | yes | ~4.3 h |
| Gas Furnace Blower (1/2 HP) | 800 W (2,350 W surge) | yes | ~8.3 h |
| Microwave (1000 W cooking) | 1,200 W | yes | ~2.8 h |
| Sump Pump (1/3 HP) | 800 W (1,500 W surge) | yes | ~21 h |
| Sump Pump (1/2 HP) | 1,050 W (2,150 W surge) | yes | ~16 h |
| Well Pump (1/2 HP) | 1,000 W (2,100 W surge) | yes | ~22 h |
Runtime uses each load's duty-weighted average draw against 90% of the rated capacity — conservative on purpose. Cyclic loads (fridges, pumps) run far longer than running-watts × capacity would suggest.
Outages the HELIOS 3600 covers
Common questions
What can the Growatt HELIOS 3600 run?
With 3,600 W of continuous output and a 4,500 W surge rating, the Growatt HELIOS 3600 runs refrigerator (modern), chest freezer, cpap machine (no humidifier), cpap with heated humidifier, oxygen concentrator, space heater (1500 w), and more. Its 3,686 Wh battery sets how long: a fridge for roughly a day, a CPAP for several nights.
How long will the Growatt HELIOS 3600 run a refrigerator?
A modern refrigerator averages about 53 W (it cycles ~35% of the time), so the Growatt HELIOS 3600's 3,686 Wh runs one for roughly 63 h before recharging.
Specs: Manufacturer published specifications (approximate; confirm on the current product page) (compiled 2026-10-05). Informational only — a computed sizing estimate from published appliance-wattage charts and manufacturer station specs. It is not an electrical guarantee. For hardwired or whole-home backup, transfer switches, or any permanent install, consult a licensed electrician.