I installed a lot of inverters branded with Effekta name-http://www.effekta.com.de/epages/63928138.sf/en_GB/?ObjectPath=/Shops/63928138/Products/SLAMVTSI
AX-K 2024(PWM)is working without problems with 1500W of PV panels.
AX-M 4048(MPPT) can handle 5000W PV panels. They have limitation for the input current.
I oversold the power of the panels in order to have charging even in cloudy days.
See here my works: www.ecowindsolar.ro