I want to monitor my PV solar system using LCD meters. I got five of those,
basic range 0 -- 200mV. Two are for voltage measurement with resistor dividers
10k/9.99M for 0 -- 200V (panel), 100k/9.9M for 0 -- 20V (battery) and three are for
current measurement (panel, load and battery bidirectional) over shunts.
According to the manual, the LCD meters must be powered by 9V battery isolated
from the measured object.
I am trying to use IA1209S DC/DC isolated low power converters powered from the
PV system battery. See the attached drawing, I have sketched only 2 of these ...
It works well with only one meter connected to the measurement object but when I
connect one more both meters the accuracy is affected.
My question is: Is there some leakage between the converters and if so, how can I
eliminate it, or must I go for the 9V batteries? I am looking for the cheapest solution.
Regards
peter
basic range 0 -- 200mV. Two are for voltage measurement with resistor dividers
10k/9.99M for 0 -- 200V (panel), 100k/9.9M for 0 -- 20V (battery) and three are for
current measurement (panel, load and battery bidirectional) over shunts.
According to the manual, the LCD meters must be powered by 9V battery isolated
from the measured object.
I am trying to use IA1209S DC/DC isolated low power converters powered from the
PV system battery. See the attached drawing, I have sketched only 2 of these ...
It works well with only one meter connected to the measurement object but when I
connect one more both meters the accuracy is affected.
My question is: Is there some leakage between the converters and if so, how can I
eliminate it, or must I go for the 9V batteries? I am looking for the cheapest solution.
Regards
peter
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