Ah vs. kWh

[Michael Neuweiler]

Usually the batteries capacity is measured in Ah's. Also the JLD 404
reports Ah's. Wouldn't it make more sense then to calculate/report Ah's
instead of kWh's in GEVCU ? Even the Brusa NLG5 has a setting for "max
ampere hours".

Michael

[Jack Rickard]

It's kind of a matter of taste to some degree.  The reason for kWh is that it is more accurate and linear.  As you drive your car, the battery voltage decreases.  With LiFePo4 is is about 3.34 starting out and by 3.0 you are pretty much done.  Of course, under load this plunges rather smartly. Nominally it is 3.2.  The motor takes the same amount of power to do the same amount of work.  So the current requirements are lower fully charged, and larger toward the end of charge to do the same power.

This means that you use less AH in the top half and the use accelerates toward the bottom.

In tracking kWh, it remains linear top to bottom.  As such, it is simply a more accurate and representative measure of battery energy usage.

Jack Rickard

On Sat, Apr 15, 2017 at 2:49 PM, Michael Neuweiler <mic...@neuweiler.biz> wrote:

Usually the batteries capacity is measured in Ah's. Also the JLD 404 reports Ah's. Wouldn't it make more sense then to calculate/report Ah's instead of kWh's in GEVCU ? Even the Brusa NLG5 has a setting for "max ampere hours".

Michael

--
You received this message because you are subscribed to the Google Groups "GEVCU-Development" group.
To unsubscribe from this group and stop receiving emails from it, send an email to gevcu-development+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--

http://www.EVTV.me

Electric Vehicle Television - KickinGas  - One Car at a Time.