SolarEdge P370 Power Optimizer: Review and Buyer Guide

SolarEdge P370 - Overview

The SolarEdge P370 is one of the most widely deployed residential power optimizers on the market, compatible with modules rated 290 - 375 Wp. It works exclusively with SolarEdge inverters and provides per-panel production data via the mySolarEdge monitoring platform. At 99.5% rated conversion efficiency, its overhead is near zero - the shading recovery it delivers is pure gain.

Real-World Yield Impact

A 2023 peer-reviewed study by Allenspach et al. (Solar RRL, ZHAW) measured output under real roof-obstruction shading conditions and found that DC power optimizers reduced string-level shading losses from 24% to 9% - a 15-percentage-point recovery over a string-only setup. On a 6 kW system producing 8,000 kWh/year, recovering 15% adds roughly 600 - 700 kWh annually. At an average US residential rate of $0.16/kWh, that equates to approximately $100 - $112 per year - a payback period of under 5 years in most cases.

How the P370 Compares

Feature	SolarEdge P370	Tigo TS4-A-O	Enphase IQ8 Optimizer
Optimizer type	Fixed-string DC	Module-level DC	Integrated microinverter
Peak efficiency	99.5%	99.5%	N/A (inverter)
Warranty	25 years	25 years	25 years
Monitoring depth	Per-panel	Per-panel	Per-panel
Inverter compatibility	SolarEdge only	Most inverters	Enphase only
SafeDC / safe voltage	Yes (1 V/panel)	No	Yes
Typical unit price	~$45	~$35 - 45	Higher (includes inverter)

The P370's main constraint is its SolarEdge ecosystem lock-in - it will not function with Fronius, SMA, Huawei, or other third-party inverters. If your inverter is already SolarEdge, or you are specifying a new SolarEdge system, the P370 is the natural optimizer choice and delivers the deepest integration with SolarEdge monitoring. If you want inverter flexibility, the Tigo TS4-A-O offers similar per-panel optimization and is compatible with most string inverters.

Key Advantages

• 99.5% conversion efficiency - near-zero optimizer overhead
• IP68 rated - fully weatherproof for all climates including coastal salt-spray environments
• 25-year warranty - matches typical panel lifespan; SolarEdge honours replacements directly
• Panel-level monitoring via the SolarEdge app and web portal - identify underperforming panels in minutes, not months
• SafeDC - panels output a safe 1 V DC when the inverter is off, significantly reducing fire and shock risk during maintenance, emergency response, and system shutdown

Compatibility

The P370 requires a SolarEdge HD-Wave or three-phase inverter on the same DC bus. It is not compatible with third-party inverters. Verify compatibility using the SolarEdge compatibility matrix before specifying. The P370 is compatible with panels from 60 to 72 cells.

Installation Notes

Installation requires a licensed electrician in most markets. The P370 mounts on the panel rail (MC4 connectors), adds minimal weight (0.95 kg), and does not require separate DC cabling - it connects inline with the existing string wiring. Commissioning time per optimizer is under 2 minutes with the SolarEdge app.

Who Is It For?

Ideal for installations with partial shading from chimneys, trees, or roof vents; complex rooflines with multiple orientations; or arrays with panels from different production batches (mismatch losses). Also a strong commercial differentiator for installers - per-panel visibility is a compelling proposition for homeowners comparing quotes. For fully unobstructed, single-orientation arrays, evaluate whether monitoring value alone justifies the added cost of optimizers versus a standard SolarEdge string inverter setup.

Rating based on 312 verified reviews from installer and homeowner submissions collected between 2022 - 2024. Rating reflects installation ease, long-term reliability, and monitoring platform satisfaction.

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Related guides: How to Increase Your Solar PV Yield by Up to 20% (see the Related Guides section above)