Two high-capacity units with very different capacity and weight profiles. The Delta Pro 3 is a true home battery; the AC200L is an oversized mid-capacity.
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Choose EcoFlow Delta Pro 3 if
+You need whole-home backup — 4 kWh in one body
+You want 4000 W continuous and 8000 W surge — enough to start compressors and run essentials in parallel
+You can house a 109 lb unit in place
Choose Bluetti AC200L if
+You need a 30A RV port for road use
+You want more outlets per pound — 6 AC outlets at 58 lb
+You want a 2 kWh unit you can still move house-to-house
The Delta Pro 3 dominates home-backup duty at 4 kWh and 4 kW. The AC200L is the better RV / solar-mobility pick — half the weight, expansion support and a real 30A RV port. Buyer for buyer, the Delta Pro 3 wins for stationary whole-home, the AC200L wins for road and solar-RV use.