Very interesting, and gives me an idea for another test I can run. I'll do the same thing, run a ceramic heater through my 1200W inverter for a specific time so I know exactly how many kWh have been removed. Then charge with the Boondocker plugged into the Kill a Watt and see how many kWh it takes to fully recharge.
Also, this brings up another question I've had. So deep cycle batteries are rated in Ah at the 20 hour rate. Draw it out quicker and the capacity is actually less, slower and it's more.
Now AFAIK people use monitors like the Triametric to measure Ah out and Ah put back in. Seems to me that if you always discharged your battery at exactly the 20 hour rate, It would work fine. But since this is not the case, I don't see how this works.
The best analogy I can come up with is this. Say you had a gas tank with no fuel quantity gauge. If you carefully measured the fuel as it's removed, you'd always know how much you had remaining. Take 10 gallons out, then measure 10 gallons back in and you'd know you are right back where you started.
But... If the size of the tank was constantly changing based on the rate at which you were drawing fuel out, you'd never know how much you had remaining using this method. :h. That's why I have a hard time understanding how something like the Trimetric provides useful info.
