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Growatt VITA 550 sizing guide
First Growatt entry — a 538 Wh, 600 W budget unit with an unusually dense port array (wireless charging pad, PD USB-C) for its class, rated 3,000+ cycles. Here's exactly what it runs, how long, and which outages it covers — computed, not marketed.
1.6 h to 100% AC (fast mode); ~2.5 h at full-sun solar · 18 lb · 3× AC, 2× USB-A, 1× QC USB-A, 1× 100W USB-C PD, 1× 15W wireless pad, 1× car, 2× DC5521.
What the VITA 550 runs — and for how long
| Appliance | Running | Runs it? | Approx. runtime |
|---|---|---|---|
| Refrigerator (modern) | 150 W (1,200 W surge) | yes | ~9.2 h |
| Chest Freezer | 100 W (1,000 W surge) | yes | ~14 h |
| CPAP Machine (no humidifier) | 40 W | yes | ~12 h |
| CPAP with Heated Humidifier | 60 W (95 W surge) | yes | ~10 h |
| Oxygen Concentrator | 350 W (600 W surge) | yes | ~1.4 h |
| Space Heater (1500 W) | 1,500 W | too much | — |
| Window AC (8,000 BTU) | 715 W (1,250 W surge) | too much | — |
| Window AC (12,000 BTU) | 1,100 W (1,800 W surge) | too much | — |
| Gas Furnace Blower (1/2 HP) | 800 W (2,350 W surge) | too much | — |
| Microwave (1000 W cooking) | 1,200 W | too much | — |
| Sump Pump (1/3 HP) | 800 W (1,500 W surge) | too much | — |
| Sump Pump (1/2 HP) | 1,050 W (2,150 W surge) | too much | — |
| Well Pump (1/2 HP) | 1,000 W (2,100 W surge) | too much | — |
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 VITA 550 covers
Common questions
What can the Growatt VITA 550 run?
With 600 W of continuous output and a 1,200 W surge rating, the Growatt VITA 550 runs refrigerator (modern), chest freezer, cpap machine (no humidifier), cpap with heated humidifier, oxygen concentrator. Its 538 Wh battery sets how long: a fridge for roughly a day, a CPAP for several nights.
How long will the Growatt VITA 550 run a refrigerator?
A modern refrigerator averages about 53 W (it cycles ~35% of the time), so the Growatt VITA 550's 538 Wh runs one for roughly 9.2 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.