Buy quality & buy once.
I bought a cheapy (well not so cheap, $10 less than the replacement below) for my shed, from Jaycar, to do exactly what you are trying to do, drove me crazy with constant errors, it's in the useless equipment bin now.
In it's place is the equivalent item from Victron Energy 100/30, works perfectly.
Will take panels up to 100V & charge/regulate a battery of 12v or 24v. Max 30A. There is also a 50A version, see both at
I'm running a 250w 24v panel into a 12v battery.
Or go to the next size up for future panel or battery expansion of your system.
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