mike-s wrote:
According to their modbus doc:
Adc_ic_f
(12)(0x000B) (A). battery charge current, filtered.
Charging current to the battery as measured by on-board shunt.
I think you have to calculate solar current = load current + battery current (maybe flip the sign on battery current?)
Take a look at this for me.
The graph is all charge_state 3 = night. There cannot be any charge current.
sqlite> select max(adc_ic_f), max(adc_il_f) from rhr where charge_state = 3 and dt>'2017-06-26 12';
0.007247314453125 0.12320434570312
sqlite>
The RPi is powered from a USB adapter connected to the load terminals.
A DROK USB tester shows the RPi drawing ~.330 mA, which is greater than the .12mA above. That is how I concluded that the 15L is not measuring battery draw overnight.
It also appears that the daytime measuring is off as well. Here is a read of current values averaged over the most recent 10 minutes:
SS MPPT 15L Meter(10 min avg):
Serial = ********
Time = 2017-06-27 14:25:03
Charge State = 7.0 <--- float
INPUT:
Array Voltage = 38.04
OUTPUT:
Battery:
Target-Volts = 13.23
Volts = 13.21
Amp-Hours = 28.1
Current = 0.69 <---- adc_ic_f
kW = 0.0091
kWhs = 17.3
Load:
Volts = 13.2
Amp-Hours = 0.8
Current = 0.13 <---- adc_il_f
Temperature:
RTS = 34.0
Heatsink = 47.0
Ambient = 46.0
Maybe you can make sense of this. The .13 is less than the RPi's actual draw.
HTH;
John
