Voltmeters defective

One of the volt/ampmeters seems to be defective: it is connected to the output of the solar controller, shows correctly the voltage, but does not show any current - even though the current is flowing to power the compressor fridge. Should be about 5A. But the meter only shows 0.01A.

So I got a replacement.

Then another voltmeter broke: the display of the main solar voltmeter suddenly did only show garbage. No numbers, but just a few segments were showing.

Will also need to replace it. Cheap junk...

Had a similar problem with other volt/amp meters for my home solar installation (Balkonkraftwerk).

Display on the solar controller shows: 57.2V input from solar, producing 12.9V output to consumer circuit.

Temporary control view board: top voltmeter shows power from solar panels, producing 1.8A at 116W. Center voltmeter shows 13.65V sent to consumer circuit, but 0.01A - cannot be, because fridge uses 5A when compressor is running. Bottom voltmeter shows battery management: can show positive (battery provides power) and negative (battery is being charged) current. Here 7.49A flow into the battery, at 13.6V, resulting in 102W battery charging.
The panel on the right is the 12V circuit breaker panel. Tom switch is on for the fridge. Other switches will be used in the future for other specific 12V devices (heater, lights, water pumps etc.).

Solar power display.

Consumer circuit display.

Battery management display.

Panel is temporary attached with bungee cord. Will be done more professional in the future.

Battery provides power: 22.7W at 1.81 A going out from the battery. 

Defective amp meter, only showing correct voltage, but not showing any current, despite current being used.

Another shot of the power meter directly at solar panels, at other time.