Curious why you dismissed this one that you would have come across in a previous post
https://www.amazon.com/RC-Electroni...qid=1516295252&sr=8-4&keywords=amp+hour+meter
Im not sure I would buy it myself (fixed 14 guage in and out wires).. but it seems be what you originally were asking for?
FYI, any instrument that displays current will use a shunt and the one in the link has an internal shunt.
I sort of would like to be able to see how many amp hours I was getting out of my solar panel - or more specifically - out of the solar panel charge controller. The one in the link probably has to get a reset by removing voltage which never happens if its measuring between the controller and the battery. But that reset would happen if the monitor was between the panel and the controller. My solar charge controller has a hardware option to tell me the current so I already have a better option (with more functions) and wont go with something like this. But.. sort of interesting to go along with the battery monitor I have monitoring what goes in and out of the battery.
FYI, I really dont use a charge monitor for trying to tell what battery capacity is. Even if you do an elaborate calibration, accuracy drifts with age and temp. My old Linklite has a capacity readout, I have not even looked at that reading for many years.
https://www.amazon.com/RC-Electroni...qid=1516295252&sr=8-4&keywords=amp+hour+meter
Im not sure I would buy it myself (fixed 14 guage in and out wires).. but it seems be what you originally were asking for?
FYI, any instrument that displays current will use a shunt and the one in the link has an internal shunt.
Edit.. not exactly true.. an instrument noted later in this thread uses a Hall effect device. If the instrument has a display and is displaying current, it likely has a small microcontroller and then its simply software and display support for amp hours. What you dont know is how well the instrument measures a rapidly changing DC current like the current pulsing you would get from an outboard charging system. Solar output changes relatively slowly but the output of the charge controller may change rapidly (even MPPT). The more expensive charge monitors do handle fast changing current and since its almost free circuit wise, I would guess even a cheap charge monitor does a fair job with fast changing current.
I sort of would like to be able to see how many amp hours I was getting out of my solar panel - or more specifically - out of the solar panel charge controller. The one in the link probably has to get a reset by removing voltage which never happens if its measuring between the controller and the battery. But that reset would happen if the monitor was between the panel and the controller. My solar charge controller has a hardware option to tell me the current so I already have a better option (with more functions) and wont go with something like this. But.. sort of interesting to go along with the battery monitor I have monitoring what goes in and out of the battery.
FYI, I really dont use a charge monitor for trying to tell what battery capacity is. Even if you do an elaborate calibration, accuracy drifts with age and temp. My old Linklite has a capacity readout, I have not even looked at that reading for many years.
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