Solar Inverter Buying Guide (2026) | PES Supply
Solar Inverter Buying Guide (2026)
Complete guide to choosing string, micro, and hybrid inverters for any solar system
Inverter Types Compared
| Type | Cost | Efficiency | Monitoring | Best For |
|---|---|---|---|---|
| String Inverter | $1,000-$3,000 | 97-99% | System-level | Unshaded roofs, budget installs |
| Microinverter | $1,500-$3,500 | 96-97% | Panel-level | Shaded/complex roofs, expandability |
| Hybrid (Battery-Ready) | $2,000-$6,000 | 97-98% | System + battery | Adding batteries now or later |
| Off-Grid | $1,500-$5,000 | 95-97% | System-level | Remote locations, no grid |
Top Inverter Brands Compared
| Brand | Popular Models | Warranty | Best Feature |
|---|---|---|---|
| Sungrow | SG4400UD, SG5.0RT | 10 yr | Best value, high efficiency |
| EG4 | 3000EHV, 6500EX | 5 yr | Built-in charge controller |
| Growatt | SPH 10000TL3, MOD 12000TL3 | 10 yr | Hybrid-ready, affordable |
| Enphase | IQ8+, IQ8M | 25 yr | Panel-level optimization |
| SolarEdge | SE10000H, SE7600H | 12 yr | Power optimizers + string |
| Schneider | Conext XW Pro | 10 yr | Grid-interactive off-grid |
How to Size Your Inverter
The general rule is to size the inverter's DC input to match your solar array capacity. Most installations use a DC:AC ratio of 1.1 to 1.3.
Inverter Sizing Rule:
Inverter AC Output = Solar Array kW × 0.8 (for 1.25 DC:AC ratio)
Example: 10 kW solar array → 8 kW inverter (10 / 1.25 = 8)
String Inverter vs Microinverter: Which is Better?
| Factor | String Inverter | Microinverter |
|---|---|---|
| Cost (8kW system) | $1,500-$2,500 | $2,500-$4,000 |
| Shade Tolerance | Poor (unless optimizers) | Excellent |
| Panel-level Monitoring | No (unless optimizers) | Yes |
| Single Point of Failure | Yes (whole system) | No (per-panel) |
| Warranty | 10-15 years | 25 years |
| Battery Ready | Hybrid models only | With IQ Battery |
| Best For | Simple, unshaded roofs | Complex, shaded roofs |
Off-Grid Inverter Sizing
For off-grid systems, the inverter must handle the maximum simultaneous AC load. Size it 20-30% above your peak load to handle surge currents from motors and compressors.
| Peak Load | Recommended Inverter | Battery Bank |
|---|---|---|
| 3,000W | EG4 3000EHV (3kW) | 5-10 kWh |
| 6,000W | EG4 6500EX (6.5kW) | 10-20 kWh |
| 10,000W | Growatt SPH 10000TL3 | 20-40 kWh |
| 15,000W+ | Multiple in parallel | 40+ kWh |