Tool
521 PowerHouseVSSOLIX C300
Compare specs, verdicts, and use-case scores side by side.
Quick Take
Best for Camping, Home Backup, CPAP, Remote Work / Starlink, and Van Life / RV: SOLIX C300
Camping→SOLIX C300Home Backup→SOLIX C300CPAP→SOLIX C300+2 more
| Spec | 521 PowerHouse | SOLIX C300 |
|---|---|---|
| Capacity | 256Wh | 288Wh✓ |
| AC Output | 300W | 300W |
| Surge Power | 600W | 600W |
| Weight | 8.2 lbs✓ | 9 lbs |
| Solar Input | 65W | 100W✓ |
| AC Recharge | ~2 hr 30 min | ~50 min✓ |
Keep in mind
Verdicts are based on manufacturer-published specs. Real-world performance varies with temperature, battery age, and load type. Use this as a starting point, not a final verdict.