This take some time to make good working DIY system. I started in 2014, with one panel one solar charger and one 180 Ah flooded Pb battery. Than I purchased Arduino and made some simple monitoring system with one Amploc sensor, One Wire Dallas temperature sensor and one voltage divider.
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A2: ... A3: ... U1: ... U2: ... A0: ... A1: ... Day: (Wh): ... SOC: (Ah): ... t: (C): ... AC: (W): ... AC-M: (kWh): ... DC: (kWh): ... AC-V: (kWh): ... U-PV: ... A4: ... H: ... M: ... S: ...