Status of Bench Testing of GS inverts.

Ah, well at least that was catch, cause I do have some things that spike real quick like a spot welder.  Also the both inverters will be no more then 5 inchs from side to side when mounted on the wall, and the wire will be roughly around5 foot 8 at the most to the breaker box.

Nice, saw the video this mroning.  Go Sid!!!  I'm knocking on your door!!!.  The reason why Grey wolf is 1  I had a wolf for 16 years, used him as a guide animal for about 4 years, before getting one from a school.  2. I'm part indian, Cherokee of the wolf tribe.  😛

Anyhow.  Can;t wait to see my babies or should I say Pups. . . 😛 

From You tube.

The current theory was for the slave inverter to run 100% throttle unless the master inverter throttled it back via positive frequency shift (a la grid
tie).  Works alright if there's 30 feet of 12-gauge wire between the 2 inverters.  But if there's no resistance to eat up the voltage regulation difference...well...it
goes a bit wrong.
I will be changing it to function in the opposite direction: slave inverters will run 0% throttle UNLESS called for by a negative frequency shift from
the master (i.e. "droop regulation").  This also will prevent the slave inverters from mercilessly slamming a generator with full power; if its output
frequency sags (under high load), the slave inverters will throttle up.
PLEASE NOTE: All regulation with this method is not instantaneous.  You will not be able to dump a 5hp well pump on 2-3 paralleled GS inverters and expect
it to start--at least not for the immediate time.  However, a parallel setup will be able to handle incremental loads up to the max wattage of all inverters
in the setup.
Linux rules.  None of this would be possible with Windoze, I'd have thrown the computer out the window already ;-

Sid, can you explain more?  Are you saying if I hook up my air compressor, then the water heater kicks on that the inverters are not going to work?

Also, like I said each inverter will have roughly 5 to 8 foot of wire going to the breaker box.  Do I need to make it a tad bit longer?

This is the current solution that I can think of...there probably is a better one that I just haven't thought of.  Need to get your inverters working together and then off to you ASAP, lest there be a wolf at my door 😉.

So at no load, the master inverter will have the slave completely off.

1. Turn on a 5kw load.  Master inverter is the only inverter on...so it takes 100% of the load.
2. Master inverter indicates 80% load with a corresponding frequency droop...
3. ...slave inverter throttles up to 80% capacity
4. ...master inverter loses most of the load to the slave, and reduces the frequency droop...
5. ...back and forth until they reach equilibrium, fairly well balanced between them.

At the end of this, the load will be roughly 2500W on each inverter.  If you bump another 3kw load on, the process MAY ripple a bit--but then again, it may balance out a lot faster than I think, as the slave will already be putting power into the system.

Mathematically, I may be able to make the "master" inverter calculate the throttle difference required for a load size vs the configured slave capacity, reducing this from a "wave in a tank flattening out"

Originally, the plan sorta needed voltage drop in the wires as an equalizing factor--so if a big load got dumped on the system, the voltage drop in the wiring from the master inverter to the panel, would cause the slave units to automatically throttle up to raise the voltage. 

Seems it worked that way and that way only...when there was no discernable voltage drop for the inverters to see, the theory fell apart.  So I'm trying a different method--and obviously, as there are WiFi firmware upgrades, I can test and provide a better solution to customers that already have inverters installed.

Ah, so basicly both inverters will be equally handleing the load when the gs mast gets over 5k.  Yous aying there is no surge when two inverts are together?  Seem like the master would handle that until the slave catches up.

As long as it works and it don't cut off while I'm doing 3d printing, right now got a printing going on that will take 28 hours before its done with one part.

17 minutes ago, The Blind Wolf said:

Ah, so basicly both inverters will be equally handleing the load when the gs mast gets over 5k.  Yous aying there is no surge when two inverts are together?  Seem like the master would handle that until the slave catches up.

 

As long as it works and it don't cut off while I'm doing 3d printing, right now got a printing going on that will take 28 hours before its done with one part.

Not quite, they will equally share the load to the best of their abilities from no load to full load.  Just saying that if both inverters are collectively running an 8kw load (i.e. ~4kw each), adding another 4kw surge to full 12kw load...may cause the master to trip (as it could potentially see the 4kw current load + the new 4kw load = 8kw total until it balances the load with the slave inverter).

Then again, it might not.  Voltage drop in the wiring might help.

Right now, almost anything is better than the current behavior 😉

3 minutes ago, Sid Genetry Solar said:

Not quite, they will equally share the load to the best of their abilities from no load to full load.  Just saying that if both inverters are collectively running an 8kw load (i.e. ~4kw each), adding another 4kw surge to full 12kw load...may cause the master to trip (as it could potentially see the 4kw current load + the new 4kw load = 8kw total until it balances the load with the slave inverter).

Then again, it might not.  Voltage drop in the wiring might help.

Right now, almost anything is better than the current behavior 😉

Well, lucky for you its not winter, so as long as I dont' fire up the 8k heater I'm good 😛  Now you makeing me think I need to order a third gs inverter. . . geesh then my breaker box will have all slot s full, its only got one left for a 240v or two 120v. dang I don't want to have to upgrade that box.

One larger inverter--once we ever get the 12kw working and ready to sell!--will have a much higher surge rating than paralleled smaller inverters.  The smaller inverters will be able to reach the full load, just with a reduced surge rating.

You should be fine.  Maybe by this winter I'll have some grand solution that makes it perfect with high load capability--we'll see 😉.

Well, I don't run that big heater unless it gets below 20 F.  so no worries I use standard infared heaters.

Sounds like you be having me do a lot of updateing the firmware lol.  though, you going to have to get that code setup for me to setup the wifi.

Sounds like a heat pump heater is something to consider. 🙂

1 minute ago, TheButcher said:

Sounds like a heat pump heater is something to consider. 🙂

It is a heat pump, its just got the stupid heat strip in it too. and it defalts to it more then anything. will have it checked out before winter and find out why.

18 minutes ago, The Blind Wolf said:

It is a heat pump, its just got the stupid heat strip in it too. and it defalts to it more then anything. will have it checked out before winter and find out why.

Pretty much all but the newest high-SEER heat pumps chicken out above 32 degrees Fahrenheit...and the ones that brave it down to near 0 degrees often end up at a COP of 1 (i.e. same efficiency as electric strip heat) by the time the ambient temp goes below freezing. 

Not at all too surprising, considering you're in sunny warm Georgia 😉.

No, I'm actually in Alabama, between Birmingham and Huntsville a hour to Miss, Tenn or georgia.  It turns on and hits around over 8k every time the heat is turned on.  i think its on emergancy heat, might be wired up incorrectly.  cause it supposed to go to stage one which is heat pump then stage two heat pump with heat strip.  At least its under warrenty.

Goodness I should stop thinking I remember all the details when I've got so many irons in the fire 😉

Would concur then that there's possibly something wrong with the unit...if it only ever runs strip heat, there's an issue (especially if it's above freezing outside).