epever 3210an overcharging batteries 18v

[jayfin]

hi peeps I'm new here and just upgraded my trailer solar camping system,

wonder if you wonderful people could help me been reading loads but cannot put my finger on this problem, bar a bad mppt

system setup:
430w flat mounted pannel
3 x 130ah lead acid batterys 12v configuration
epever 3210an (baught this second hand off ebay think this could be the problem)

so after running the system for 24h noticed the batterys were showing 18v. the app kept showing the batterys charge level constantly changing 70% then up to 90% with no loads on the bank.

have turned the hole system off to save the batterys

what can cause this to put 18v though the systems

have attched pictures

 

[mikefitz]

what can cause this to put 18v though the systems

Your meter battery needs changing.
The Tracer shows the correct voltage 14.69
Ignore the SOC reading on the Tracer, its voltage based and not a reliable indicator.