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He said something about haveing both gs inverters balance the load when he puts the heater coils to it? So its going to split the diff? If that is the case, that would be better, since I will have two sets of cable coming off the batter bank, so that would reduce the load on a set of cables
Not sure at the current time.
and I would like it to be able to do that, that way if the master inverter is charging the bank, the slave can help out while that is being done.
This is an impossibility. If the generator cannot power the entire load, there is no way that you will ever be able to charge the batteries while simultaneously running them out. You'll be able to reduce the speed of running them out...but they're still going to run out if the generator can't offset the entire load.
120v input to a panel isn't an issue, as long as there is no L2 connection from the input power source to the output inverter terminals. As long as there are only 2 connections from the input power source, you'll be fine.
They make a number of modules that can both sense and control 24 Volt circuits. The problem is .............................................. 25 Volts is the max that they will work with.
I use generic i2c ADC modules that neatly plug into the GPIO header on most SBCs. The ADC in the SoC on most SBCs including the Pi is not particularly good and quite noisey too.
A resistor divider, like Sid said, brings the voltage to within the window the board can handle. There's no need to get precision resistors or the like. Temperature stable is more important, but even then not that much if you only want a pretty good idea of the voltage rather than precise readings. Calibration in the software is how you take the inaccuracies of the divider into account. Attach a known voltage to the divider, check what the ADC says and make a fudge factor based on that in the software.
The only thing to be careful about most of these ADC modules is absolutely nothing below 0V WRT the 0V/ground. If you go more than 100mV below 0 the devices usually die.
Found one that will work with up to 36VDC. https://www.adafruit.com/product/4226?gclid=Cj0KCQjwyN-DBhCDARIsAFOELTk6XY85PBR0f65XnZyMKsQzmgqrvrUwVKIeoKKgtactjzfFAqJR27saAjjJEALw_wcB
That's a pretty badass sensor.
Found one that will work with up to 36VDC. https://www.adafruit.com/product/4226?gclid=Cj0KCQjwyN-DBhCDARIsAFOELTk6XY85PBR0f65XnZyMKsQzmgqrvrUwVKIeoKKgtactjzfFAqJR27saAjjJEALw_wcB
Thanks, that is what I needed, just order 4 of them. I even seen a 60v version :P. now to get that, then program the pie to send me a email every so offten or something to that effect, Already got a pie 3 working as a 3d printer server, and my 400 pie is well being used for programming.
got another pie 3, will set it up for the power room, will have it monitor power of the batts, and maybe even replace my smart things hub and control my house too.
From the YT clip, 88% efficiency. That's a heck of a start. Sid & Sean need to do a full sweep of capabilities into a resistive load to see just what the GS inverter can do. Victron states 94-ish% for their LF inverters and the GS is within arm's reach of that.
Well done.
From the YT clip, 88% efficiency. That's a heck of a start. Sid & Sean need to do a full sweep of capabilities into a resistive load to see just what the GS inverter can do. Victron states 94-ish% for their LF inverters and the GS is within arm's reach of that.
It would be interesting to dig into the mathematics of loss (i.e. FET switching resistance, transformer resistance) and calculate how much of the loss is in those 2 items.
Interesting that their off-state power and no-load power numbers are also extremely good.
Hmmm, actually 1500w at 74a is 84%.
I'm wondering if the victron is truly a 94% as they clam.
I really wondering what the draw is at max load, that is what I want to know for my setup.
I really wondering what the draw is at max load, that is what I want to know for my setup.
If we conclude 88% efficiency @ 24v, that works out as follows:
100% - 88% = 12% loss, so 6,000W * 112% (1.12) = 6,720W input required (for a 6,000W output) / 24v = 280A drawn from the batteries.
I would expect the efficiency to rise slightly at higher battery voltages, so 90% is likely quite attainable here.
8 minutes ago, The Blind Wolf said:Hmmm, actually 1500w at 74a is 84%.
You referring to the GS inverter in the efficiency test video?
1564W out as measured by the Kill-A-Watt.
74A @ 24v in = 1,776W. Thusly, 1,564 / 1,776 = 0.880630631 = 88% efficiency.
I'm wondering if the victron is truly a 94% as they clam.
They've been around for so long and so many tests of how their equipment performs done that anything they say in terms of performance can be accepted as fact.
The important point here is that right out of the gate the Genetry inverter is doing really well with performance up around the big boys. So well that it is well clear of most of the generic Chinese LF inverters and breathing down the neck of the generic Chinese HF inverters too.
I would imagine that there is a "sweet spot" in the efficiency of any inverter. Transformers are most efficient when loaded to near their capacity yet the FETs go down in efficiency with more loading. The point where the lines cross on a graph would be the optimal efficiency.
Manufacturers likely state the efficiency at the optimal loading point vs maximum loading.
You referring to the GS inverter in the efficiency test video?
well I didn't se the meter, he said 1500w 😛