I ordered one of these recently and received a Siamese version been set up to close to seperate.
What's up ? (Trying to charge 24V start from solar. using AliExpress bits)
After reading this discussion, fitted circuit board, oops only regulated power supply.
Changed to charger circuit board but pots would not adjust.
Changed to charger circuit board with digital display, can set V & A and it works.
BUT - have MCB between solar panels and Votronic MPP250 controller.
Feed to charger is from controller side of MCB.
With MCB open 12V house batteries are charging 24V start batteries thru charger ??
To quote from Votronic manual "Standard protection against overload, overheating, reverse battery and back discharge of the battery (in case of insufficient solar power, such as at twilight, at night etc.)."
Charger won't run on power from 24V.. requires input power.
I guess I need blocking diode from MPP250 ? What size?