I wouldn't even think about the first 2 in your list.
But had I known about your 3rd option a year ago when I built my power brick I would have jumped onto it straight away, I like the sensor idea much better than a shunt that can cause failure one day.
What I use isn't even on Ebay anymore, it uses a shunt, has a monochome LCD and shows everything at once but it is not bidirectional, although I don't find that essential. The batteries are generally full by the end of the day, which I see from the voltage so I already know how much capacity I have. For me it is important to know how much I consume.
From experience your battery voltage is a rather good indication of the state of charge when you can see how many kW or A it is currently consuming and also how many kWh has been used since the full last charge or the last time I pressed reset. In reality I am mainly interested about how many kWh I have used overnight and my voltage so I can fine tune things.
A battery symbol with just volts or amps like your first two suggestions would be totally useless for me and peddling around with buttons to see the current and accumulated load would drive me nuts every time. I like a cockpit display that shows everything at once including temperature.
Edit: I contacted the because the listing does not explain the Wireless functionality. There is a Wifi symbol in the display and if that means I can take the display inside and monitor my battery remotely I am definitely buying this. Just odd that it is has no enclosure.
Bookmarks