Arrived after 35 working days. Tested with rated output current: Everything ok. When charging a 12V lead acid battery (with a diode at the output) it could even deliver currents between 25 and nearly 40A for about a minute, then the current falls below 25A. The massive heatsink helps to cope with the losses for that short period, it never got to hot to touch it, even after some hours (then at lower currents of about 10-20A). Thank you!