Solar Stack
Solar Stack
How it worksGuidesAdd Equipment
Sign in
Solar Stack

Free solar panel & inverter compatibility checker. Verify your PV string configuration is safe before installation.

Tools

  • Calculator
  • Panel Matcher
  • Inverter Finder
  • Inverter Compare
  • Panel Replacement
  • Cable sizing

Resources

  • Guides
  • How it works
  • Standards & Compliance
  • Data API
  • Replacement methodology
  • Add Equipment
  • Feedback

Legal

  • About
  • Support
  • Privacy Policy
  • Terms of Service
  • Cookie Policy

© 2026 Solar Stack

Solar InvertersKOSTALPIKO 4.2 (2 MPPT)

KOSTAL PIKO 4.2 (2 MPPT)

4200 W2 MPPT180–850 VMarket: Europe & UK
Find on AmazonCheck current price and availability

As an Amazon Associate, Solar Stack earns from qualifying purchases.

The KOSTAL PIKO 4.2 (2 MPPT) is a 4200 W solar inverter with 2 MPPT trackers. Below are the verified electrical specifications extracted from the manufacturer datasheet.

Technical Specifications

DC Input
Max DC Input Voltage
: 950 V
MPPT Voltage Range
: 180–850 V
Max Input Current (per MPPT)
: 9 A
Max Short-Circuit Current (per MPPT)
: 12.6 A
Start-up voltage
: 180 V
AC Output & System
Nominal AC Output Power
: 4,200 W
MPPT Trackers
: 2
Strings per MPPT
: 1
Type
: String
Battery port
: No

Best panel configuration

The fully compatible panel setup from our catalog that makes the best use of this inverter, calculated for -20°C to 35°C.

REC GroupHJT

REC455AA Pure-RX

Compatible

5.0 kW

11 panels of 455 W

≈4.5 kW in summer heat (-10%)

How to wire it · 11 per string

  • MPPT 1
    1 string
  • MPPT 2
    free
Panel area
22.9 m²
Panel weight
250 kg
DC/AC ratio
1.19×
Check in calculatorAll compatible panels

Datasheet

Download PDF1.1 MB
Sourcekostal-solar-electric.com

Check in calculator

Verify string compatibility with this inverter

Find compatible panels

See which solar panels work with this inverter

Compare with another

Put this inverter side by side with up to four others