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Yea, I agree that the 20ms surge has to be the bogus spec. My air conditioner says it is 1600 watts, and that the locked motor amps is 50 @120v, so 6000watts at startup peak. My hope is that the WZRELB 4kw will start the AC motor because it says it can surge to 8000w. I would like to think that...

Agreed. However for now, you'll have to make do with my blabbering below. I have a lot of work to do to be able to answer the voltage resolution question. There's the accuracy of the voltage reference, the attiny ADC, temperature coefficient, bla, bla. The subjective answer is that I am happy...

That's the info I was looking for, thanks! I have no problem doing the modbus, ethernet, rs485 route, but I'm not thrilled with that because sending an "OFF!!!!" signal via a complicated communication protocol is lousy. The thermocouple is also doable, but Ugh! I'd be happier with a simple...

I think I saw that, but I did not understand the main architecture.

I don't see the problem. Both of these URLs work for me: https://pnwsoft.com/Taves/Schematic_controller.pdf https://pnwsoft.com/taves/schematic_cells.pdf

No, this does not justify 10mV. It only states it. It does not specify whether this is _+10mV or +- 5mV. It makes the case that 100mV is too coarse and 1mV is not necessary. Is 10mV the only number between 1 and 100? I think the circuit is delivering at least +-10mV.

An MPPT is not always more efficient. You'll notice they generally have heat sinks, that means they throw away energy. The SSR's I have produce almost no heat. One needs to prove that the MPPT will be worth the $ and it depends upon the use case, batteries, temperature, and the panels. If you...

If you cannot measure the amps between the cells, the cell SoC is nothing more than an individual cell voltage times some constant. I don't mean the Amps are constant over time, but it is over the set of cells. There's nothing to be gained, except confusion, by switching from one unit of measure...

Right, because it is impossible to turn charging back on after the cells have recovered to a lower V when the amps are naturally lower from the Sun. See above, where I accept the stated religion. Do any of these MPPT charge controllers do this besides not charging when near freezing and below...

I know. You should read this thread and find where I state that I will periodically run the cells to the knee to reset the accumulated error.

I agree this is not a terribly important point. The point is that you just string together as many as you want. @Roqm needs 13s, and if I had 13 batteries I could show you a screen shot of it in action right now. Again, I am not saying that there are no better solutions. I am just saying I...