From time to time our Charger Phoenix Multiplus 12/2500/120 does not supply 220 Volt as the switch "Inverter On" is activ. The blue LED control is on as usual but no 220 Volt is supplied. No other light or warning. It happens from time to time although we did not change system or any settings for years. After a while of up to 1 hour 220 Volts is finally supplied. It happened this year first time after many years of reliable service. Batteries 600 Ah AGM are always min. 90 % charged.
Any idea what's wrong?
Thanks for any information
