
Along with all the other complaints about this and similar ones sold under different names (short cables, hard to read screen, accuracy, exaggerated current handling etc. ) The manual is wrong in terms of cumulative values, for example it says 6554 watt hours. It returns to 0 at 655.4Wh. Amp hours are the same. It is not possible to calibrate volts and amps from a known accurate source. The power consumption clearly exceeds the value specified in the "manual". Only useful for radio control. Do not buy this for solar system monitoring.

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