For a 120 V cabin, shed or backup circuit on a 48 V battery where a UL listing matters. The low-voltage solar input suits small arrays, not large roofs.
Amazon Renogy $599.99
For a small 120 V cabin or shed system on a 48 V battery that needs a UL-listed unit for little money. Large arrays are better served by a 500 V input.
- 3.5 kWOutput
- 48 VBattery
- 4,400 WSolar input
- 1 yearWarranty
Price checked October 23, 2026. As an Amazon Associate we earn from qualifying purchases.
- ETL listed to UL 1741 at a low price
- Charges at up to 120 A from solar and grid together
- Up to six units in parallel, including split-phase pairs
- 145 V solar limit means short strings of panels and heavier PV wiring
- One-year warranty
- Wi-Fi monitoring is an add-on module
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its output. How we rank explains each one.
Specifications
| Model number | ECO3500W(SR) |
|---|---|
| Output | |
| Output voltage | 120 V single-phase |
| Continuous output | 3,500 W |
| Surge | 6,000 W |
| Peak efficiency | 91% |
| Transfer time | 10 ms |
| Parallel units | Up to 6 units |
| Solar | |
| Max PV power | 4,400 W |
| Max PV voltage (Voc) | 145 V |
| MPPT range | 60 to 115 V |
| MPPT trackers | 1 |
| PV current per tracker | 50 A |
| Battery and grid | |
| Battery voltage | 48 V |
| Max charge current | 120 A |
| AC charge current | 40 A |
| Grid sell-back | No |
| UL 1741 | Yes |
| Build | |
| App monitoring | Optional add-on |
| Dimensions | 426 x 322 x 124 mm |
| Weight | 23.1 lb |
| Warranty | 1 year |
Alternatives in this output
The budget version of the SPH5048P for single-unit 120 V systems that will never need 240 V.
Amazon SunGoldPower $589A cheap 24 V inverter for cabins and RVs that can take long high-voltage panel strings. It cannot grow past 3 kW.
Amazon SunGoldPower $459Compare
Compare the ECO-WORTHY 3500W 48V AIO Inverter with any other hybrid solar inverter →
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