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<a href="/topic/87-status-of-bench-testing-of-gs-inverts/page/7/?tab=comments#" style="background-color:transparent;color:inherit;font-size:16px;vertical-align:middle;" rel=""> On 5/2/2021 at 8:11 PM, <a data-ipshover="" data-ipshover-target="/?app=core&module=members&controller=profile&id=58&do=hovercard" href="/?app=core&module=members&controller=profile&id=58" style="background-color:transparent;color:inherit;" rel="">Richard said:I'm thinking another inverter in a daisy chain will be a whole lot safer????? Are gen 1 and 2 compatible for daisy chain?
Can't guarantee that a parallel/daisy setup will have a significantly higher surge capability, as the "master" inverter has to "call for help" to the slave inverters. However, they'll still try to regulate voltage...so a sag in the power line will be an instantaneous "call to action."
All GS inverters will be compatible with daisy chain--after I get the code tested and working ;-). Today's project, it looks to be quite the gloomy and rainy day, so nothing better to do than work on code.
How big is your central air (tonnage)? I'd expect a surge of >70A easy on 240v if it's of any size--and especially if it's older. Also, what voltage GS inverter do you have, and what size battery bank / cables?
<a href="/topic/87-status-of-bench-testing-of-gs-inverts/page/7/?tab=comments#" style="background-color:transparent;color:inherit;font-size:16px;vertical-align:middle;" rel=""> On 5/2/2021 at 8:11 PM, <a data-ipshover="" data-ipshover-target="/?app=core&module=members&controller=profile&id=58&do=hovercard" href="/?app=core&module=members&controller=profile&id=58" style="background-color:transparent;color:inherit;" rel="">Richard said:Then we get into the question of deep well pump and jet pump that are running on a 6kw Sigineer I'd really like to get rid of... I'm listening...
If the Sigineer can run 'em, there shouldn't be any issue with the GS running them. Assuming the Sigineer is the same voltage as the GS inverter?
Answering the question for myself, the minimum amps required for the a/c is 38...that's over 9kw by my calculation.
Providing additional information to you: York, 1 HP motor, 2 tons, recommended to be on a 50 amp breaker (by the label on the unit). Couldn't find a user manual online so it must be old.
GS inverter is a 6kw at 48 volts.
Battery bank is 25kwh. Connection from bank to inverter is 4/0 cable.
So would it be better to wait for one of your 12kw inverters, rather than daisy? Even more important (now, I think), will a 12kw and 6kw be able to daisy chain? (For the day when my wife turns on the washer and dryer at the same time the ac starts up...?)
I'm really beginning to think I should ****can the old ac and go with some mini-split units...
BTW, the Sigineer (6kw/48v)(in my opinion) is only slightly better than a PJ...When I tried putting both 120/240 loads on it, it would usually shut down below a 3kw load. In it's defense, at least it shut down, instead of blowing up (which I did to one of their 12kw inverters that was designed in cooperation with Jack R of EVTV (RIP-I loved listening to his vlogs). So now, all it's (the 6kw) doing is the 240 loads of the deep well pump and jet pump. (12kw is still sitting in pieces in the power room...haven't felt like opening the replacement parts box...)
So would it be better to wait for one of your 12kw inverters, rather than daisy?
If you want instant surge capability...yes.
Even more important (now, I think), will a 12kw and 6kw be able to daisy chain? (For the day when my wife turns on the washer and dryer at the same time the ac starts up...?)
Yes. If I can get this parallel-inverter control method to work well, it won't matter what the battery voltage or inverter size across the parallel inverters.
GS inverter is a 6kw at 48 volts.
Definitely not a problem with your setup 😉. Just wanted to make sure you weren't one of those guys trying to run their house off of a single worn out car battery and jumper cables.
You should be able to run the loads your 6kw Sigineer could do, on the GS inverter. If you want to.
But if your central air is rated 38A run (38A * 240v = 9,120W), the surge will be WAY higher than that. Max of a 6kw split-phase inverter is (6000W / 240v) = 25A. So you'd definitely need a 12kw inverter to run the central air.
Thanks.
When is the 12kw going to be ready for sale? I waited more than 6 months for the 6kw, so I can be patient...(insert grin here) (And that's from the pre-sale date. Include all of Sean's babbling about it and it seems like about a decade.)
Now for a bit of nitpicking...
Any way to get clocks to work properly? In about 2 weeks, they're running about 20 minutes ahead.
Voltage reading in the app seems to be inaccurate at times (on the low side).
When is the 12kw going to be ready for sale?
Once we get the FET drive issues sorted out. Currently trying to get the firmware with all the necessary features...then handle supply chain work for more inverters, newer design, etc. LOTS of things to do on the development side...
Need to order sample boards, hopefully sometime this month. If tests go well, then we'll be able to order some 12kw inverters in. Chassis, tranny, etc. all were good--just the FETs being problematic.
Any way to get clocks to work properly? In about 2 weeks, they're running about 20 minutes ahead.
If you're running a new-ish firmware (at least 1.1r0), you can "tweak" the output AC frequency in ~0.25Hz increments (CFG -> AC Output/Inverter -> Hz Trim). Hopefully this level of trim is sufficient to get your clocks at least a bit more accurate 😉.
Voltage reading in the app seems to be inaccurate at times (on the low side).
This'd be from the power monitor chip...which by itself is extremely accurate. Unfortunately I used optoisolators to isolate the AC feedback signal...didn't realize how bad their temperature coefficient was until after 2 batches of control boards were ordered. Internal inverter temperature will play with the regulated output voltage AND registered output voltage by 2-3v; this is a design fault.
You can calibrate the registered AC output voltage in CFG -> System -> Calibrate Readings; of course, keep in mind, you'll want to calibrate the readings to a multimeter for best results.