Tesla Powerwall vs EG4 vs Enphase Battery Comparison
Detailed comparison of the top home solar batteries in 2026
Side-by-Side Comparison
| Feature | Tesla Powerwall 2 | EG4 LifePower4 | Enphase IQ Battery 10C | Fortress eVault Max |
|---|---|---|---|---|
| Capacity (per unit) | 13.5 kWh | 5.12 kWh (modular) | 10.08 kWh | 18.5 kWh |
| Chemistry | NMC Li-ion | LiFePO4 | LFP | LiFePO4 |
| Depth of Discharge | 100% | 100% | 100% | 100% |
| Round-trip Efficiency | 90% | 95% | 89% | 95% |
| Cycle Life | 5,000+ | 7,000+ | 6,000+ | 6,000+ |
| Continuous Power | 5.8 kW | 5 kW (per module) | 7.6 kW | 8.2 kW |
| Surge Power | 10 kW | 10 kW | 9.6 kW | 12 kW |
| Voltage | 350-450V DC | 48V DC | 64.8V DC | 48V DC |
| Warranty | 10 yr / 70% | 10 yr / 80% | 10 yr / 70% | 10 yr / 80% |
| Price (per kWh) | ~$630-$815 | ~$300-$390 | ~$790-$990 | ~$430-$540 |
| Price (typical system) | $8,500-$11,000 | $1,500 per 5kWh | $8,000-$10,000 | $8,000-$11,000 |
| Scalable | Up to 10 units | Up to 16+ modules | Up to 4 batteries | Modular |
| Built-in Inverter | Yes (AC coupled) | No (needs separate) | Yes (AC coupled) | No (needs separate) |
| Outdoor Rated | Yes (-4°F to 122°F) | No (indoor) | Yes | Yes |
Which Battery Should You Choose?
Tesla Powerwall 2 — Best All-in-One
Best for homeowners who want a turnkey system with built-in inverter, outdoor installation, and brand reputation. Most expensive per kWh but includes installation and monitoring. AC-coupled, works with any solar inverter.
EG4 LifePower4 — Best Value
Best for budget-conscious DIYers and off-grid systems. At $300-$390/kWh, it's less than half the cost of Tesla. Modular design allows building any capacity. Requires a separate 48V inverter (EG4 3000EHV or 6500EX). Indoor installation only.
Enphase IQ Battery — Best for Microinverter Systems
Best for homes with Enphase microinverters. AC-coupled, integrates seamlessly with IQ8 system. Premium price but excellent reliability and 25-year microinverter warranty extends to battery system.
Fortress eVault Max — Best for Large Capacity
Best for whole-home backup and off-grid. At 18.5 kWh per unit, fewer units needed for large capacity. LiFePO4 chemistry = safest, longest-lasting. Outdoor rated. Requires separate inverter.
Cost Comparison (20 kWh System)
| System | Units Needed | Equipment Cost | Inverter Cost | Total |
|---|---|---|---|---|
| Tesla Powerwall 2 | 2 × 13.5kWh | $17,000-$22,000 | Included | $17,000-$22,000 |
| EG4 LifePower4 | 4 × 5.12kWh | $6,000-$8,000 | $1,500-$3,500 | $7,500-$11,500 |
| Enphase IQ 10C | 2 × 10kWh | $16,000-$20,000 | Included | $16,000-$20,000 |
| Fortress eVault Max | 1 × 18.5kWh | $8,000-$10,000 | $2,000-$4,000 | $10,000-$14,000 |