ECO-WORTHY PowerMega 314
A low-cost 16 kWh floor battery for off-grid and backup builders who want big capacity with few modules. Permitted grid-tied installs may need a model with UL 9540A.
Amazon $2,499.99 ECO-WORTHY $2,339.99$2,339.99
The ECO-WORTHY PowerMega 314 and the Discover Helios ESS 16kWh are evenly matched, rated 4.3 and 4.3. The ECO-WORTHY PowerMega 314 leads on value. The Discover Helios ESS 16kWh wins on safety listing and features. The ECO-WORTHY PowerMega 314 costs $1,210.01 less ($2,339.99 vs $3,550).
Discover Helios ESS 16kWh
For homeowners who want a single large, heated, outdoor-rated battery that passes inspection. Its UL 9540 listing and direct inverter communication make it an easy choice for permitted grid-tied and off-grid builds.
NAZ Solar Electric $3,550$3,550
Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the ECO-WORTHY PowerMega 314 for value ($146 per rated kWh vs $221 per rated kWh).
- Choose the Discover Helios ESS 16kWh for safety listing (UL 1973, UL 9540 listed vs UL 1973 listed) and features (inverter communication, self-heating; no app vs app; no self-heating).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every wall and floor mount 48V solar battery; a clear win is highlighted. How we rank explains each one.
| Factor weight | ECO-WORTHY PowerMega 314 | Discover Helios ESS 16kWh |
|---|---|---|
| Overall rating | 4.3/5 | 4.3/5 |
| Value 35% | 100 $146 per rated kWh | 84 $221 per rated kWh |
| Output 15% | 48 200 A continuous (about 10.2 kW) | 48 200 A continuous (about 10.2 kW) |
| Warranty 15% | 100 10-year warranty | 100 10-year warranty |
| Safety listing 15% | 50 UL 1973 listed | 100 UL 1973, UL 9540 listed |
| Cycle life 10% | 100 10,000 cycles, maker rating | 50 cycle life not published (neutral score used) |
| Features 10% | 50 app; no self-heating | 70 inverter communication, self-heating; no app |
Specifications
| ECO-WORTHY PowerMega 314 | Discover Helios ESS 16kWh | |
|---|---|---|
| Capacity | ||
| Case | Wall or floor mount | Wall or floor mount |
| Nominal voltage | 51.2 V | 51.2 V |
| Capacity | 314 Ah | 314 Ah |
| Energy | 16.1 kWh | 16.1 kWh |
| Usable energy | 16.1 kWh | 16.1 kWh |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 10,000 | - |
| Power | ||
| Continuous discharge | 200 A | 200 A |
| Peak discharge | - | 300 A |
| Max charge current | 200 A | 200 A |
| Modules in parallel | Up to 15 | Up to 36 |
| Safety and communication | ||
| UL 1973 | Yes | Yes |
| UL 9540A | No | Yes |
| UL 9540 | No | Yes |
| Communication | CAN, RS485, RS232 | CAN (direct, Pylon protocol); LYNK port to LYNK II Gateway |
| Works with inverters | - | Sol-Ark, Victron, Schneider, Deye, Growatt, Luxpower, Megarevo, NOARK, Solis, Sunsynk |
| Self-heating | No | Yes |
| App | Yes | No |
| Build | ||
| Display | Yes | No |
| Built-in breaker | Yes | Yes |
| Enclosure | - | IP65 |
| Dimensions | 33.13 x 19.69 x 10.24 in | 900 x 465 x 247 mm (35.4 x 18.3 x 9.7 in) |
| Weight | 280 lb | 299 lb |
| Warranty | 10 years | 10 years |
| Released | 2026-02 | 2025-02 |