Is there a kit out that has built in amp-hour meter?

[flyingbeekeeper]

From my research, I'd say no. Yea, I'm aware the latest display from Bafang BBS02 has a watt meter, but not a watt-hour meter.

 

[t_tberg]

I don't think you can really beat the functionality of a cycle analyst

 

[flyingbeekeeper]

I don't think you can really beat the functionality of a cycle analyst

Yes I can, and I can't use a CA for this project. Have to find a far small, covert amp-hr meter.

 

[d8veh]

Of course there are!. Any kits that use Kunteng controllers, which are now very ubiquitous, have a wattmeter built into the display, and many other displays from Bigstone and Kingmeter also show watts. You guys are living in the past.

http://www.szktdz.com/en/news_show.php?article_id=344

Example kits. The S-LCD3 can be used with most of the kits and controllers they sell:

https://bmsbattery.com/search?controller=search&orderby=position&orderway=desc&search_query=s-lcd3&submit_search=

 

[flangefrog]

Of course there are!. Any kits that use Kunteng controllers, which are now very ubiquitous, have a wattmeter built into the display, and many other displays from Bigstone and Kingmeter also show watts. You guys are living in the past.

The OP is asking for a Wh/Ah meter not a watt meter.

I'm not aware of any kits that have this functionality. Since the Kunteng controllers report both Watts and Volts it would be pretty easy to connect an Arduino to the display output of the controller and measure the Wh/Ah (obviously with voltage smoothing turned off). I doubt it would be very accurate though. You may even be able to get it to display the calculated Wh by outputting the value to the display using the Watt field or another field that isn't so important.

I assume you're aware of the cheap GT Power Analyzers? I'm actually designing a very tiny and accurate power analyzer similar to these but using Bluetooth LE instead of a display. Won't be released for a while though. It would be pretty easy to make a simple version of this using an Arduino, INA226 or similar current shunt monitor, shunt (or controller shunt + calibration), voltage divider and [probably linear or shunt] regulator.