Pre-Order Discussions

8 hours ago, Sid Genetry Solar said:

just two months ago.

I thought you cut all manufacturing/production ties with PowerJack in January 2023, after being strung along since August 2022 preorders....seems like I had seen various YouTube videos of sean where it was one delay after another and predicted ship delivery dates never met...

I have had 2 fraud sellers removed from ebay....

I do wonder about the capacitor function is essentially to filter and aid the voltage regulation .... corrrect???....as that was one of your stumbling blocks to improve it...

I recently won an eBay auction for a 30k PowerJack  LF PSW SP module version inverter delivered for $477.57 paid via PayPal through eBay that should be here by the end of May.....so an inexpensive backup for a backup inverter... Sean always says get a back up...

hope it arrives without issues....I know they definitely will not ship it in a wood crate >>>> lucky if it gets single boxed now days....as they cut corners....

the heavy 12k LF Sungold Power inverters come on a wood crate to protect them.

sounds like the locally sourced gs inverter boxes may be good protection if the shipping company (UPS/FedEx) is not too rough with them...

perhaps future experience will determine shipping and all logistics for the day...😎

have a great weekend....

7 minutes ago, pilgrimvalley said:

I thought you cut all manufacturing/production ties with PowerJack in January 2023, after being strung along since August 2022 preorders....seems like I had seen various YouTube videos of sean where it was one delay after another and predicted ship delivery dates never met...

Yes.  We cut ties with them right as the Chinese New Year started (in mid January) without any of the promises being met.  By that point, it had become extremely obvious that we were being uselessly strung along.

But then we couldn't start sourcing/ordering parts until after the Chinese New Year Holiday had ended--thus the mention of February.

8 minutes ago, pilgrimvalley said:

I do wonder about the capacitor function is essentially to filter and aid the voltage regulation .... corrrect???....as that was one of your stumbling blocks to improve it...

It is to filter out the SPWM carrier frequency that gets passed through the toroidal transformer.  Ideally, this'd be on the primary side of the transformer after the ferrite chokes--but putting it there is extremely difficult logistically.

Voltage regulation is a completely separate issue.  The increased AC output caps seem to help extra-sensitive electronics by way of a cleaner sine wave.  Makes me wonder if these appliances have a high-pass filter connected to the AC line, and "fault out" if there's "too much noise" on the line.  Which an overly aggressive regulator response could potentially trigger--especially if the regulator gets into a wild oscillation with itself.

11 minutes ago, pilgrimvalley said:

the heavy 12k LF Sungold Power inverters come on a wood crate to protect them.

well, yeah--they're so heavy that they have to ship freight!  Can't pick up a cardboard box with a forklift!

11 minutes ago, pilgrimvalley said:

sounds like the locally sourced gs inverter boxes may be good protection if the shipping company (UPS/FedEx) is not too rough with them...

They are guaranteed to meet UPS/FedEx shipping requirements.  Packing company told us that this means we are guaranteed to win shipping insurance claims resulting from transit damage--no "weak packaging" excuses can be made.

Honestly, shipping damage has not been a significant problem for us.  Number one fix was to tighten up the transformer brackets--so the transformer doesn't become a wrecking ball in transit.

6 hours ago, Sid Genetry Solar said:

Voltage regulation is a completely separate issue.  The increased AC output caps seem to help extra-sensitive electronics by way of a cleaner sine wave.  Makes me wonder if these appliances have a high-pass filter connected to the AC line, and "fault out" if there's "too much noise" on the line.  Which an overly aggressive regulator response could potentially trigger--especially if the regulator gets into a wild oscillation with itself.

My suspicion is it's more related to the reason people have issues with Submersible well pumps. (All about load surge) The sudden surge causes a more significant voltage drop on such a small power source - probably tripping an electronic safety. I can imagine a lot of VFDs being very sensitive to very brief [but significant] voltage drops - not because they couldn't handle them - but because the designers don't encounter them.
Engineers likely design against grid conditions, not off-grid conditions, so they never notice the overly sensitive fault.

This is kind of like how the GS will go into overload/short protection before a breaker. The electronic safety is much faster than the mechanical one. Or to apply it to this situation, the VFD fault is faster than the GS's regulator.

As usual, a spiel of speculation from me. Naturally, individual circumstances will vary. 😕

It's worth noting that MOST of the voltage drop under surge is a result of voltage drop in the provided battery bank.  And as there's so many different battery chemistries (not to mention battery aging!), it is extremely difficult to mathematically correct for load sag without ending up in wild oscillations. 

There may be some way I can have the inverter guesstimate the battery's ESR, and then utilize that number as a "correction" on the regulator input--in other words, trying to counteract the battery's sag.

...if you've ever looked at the "Throtle" on the Diagnostic Info screen, you'll notice that it changes far more for battery voltage change, than for load.  (Although the two are often rather tightly connected, for obvious reasons!)

The biggest issue is that I haven't been able to reproduce this issue on my bench.  Or Sean's bench.  Or any other customer.  If I could personally examine what's going on, it would be much easier to collect the necessary data to figure out what the problem is--and solve it.

*snickers* I bet this is whats going on with my 6k gs trying to run the washer. and I got plenty of battery power, if I'm able to run a 3 ton AC and everything else.

What battery cables are you running

Wire gauge and length will effect voltage sag

Big time. Minimum 2/0 for my 24V GS6K IMO... even for short runs.

Also, Plenty of KWh doesn't necessarily mean plenty of KW.
The BMS in LI batts will bail pretty quickly if they reach threshold. (I think he uses LiFePO4)

So many variables in this conversation.

Totally agree

I don't think his BMS is bailing, but voltage sag tripping off the appliance seems likely 

I'll be adding a "DBTY" oscilloscope channel to the GS inverters in the next update for just this purpose: to visualize realtime battery voltage sag. 

It's possible there may be some way to mathematically estimate battery ESR from the sag resulting from a given load.  Challenges of course are numerous--not the least being battery voltage sag as it discharges!  And of course battery temperature coefficients, etc., etc.  Being 100% precise is going to be basically impossible--but if the inverter can calculate a rough estimate, that might be enough to significantly improve transient load response times on GS inverters.

April 19th, 2023:

• Order of GS MOSFET boards is completed & shipped.

  <fileStore.core_Attachment>/monthly_2023_04/FETs.jpg.01252ee0e5c1a0089aca358335b1599b.jpg

  this of course is just a portion of the total...
   

• Sample order of fans from a new supplier has passed tests and will be shipped today:
  
  definitely a different supplier: notice the different design/shape of the propeller and especially the back.
   
• Capacitor order is paid.  Goes by air.
• Inverter chassis: they're "in the system" at the local machine shop.  Said shop is planning to make 1pcs to for verification--followed by the rest of the order
• packaging boxes: gotta love American companies.  Turns out that the rep Sean was working with...got fired (as a result of constant excuses for not coming to work).  And nobody took over their email--which explains why we weren't getting any responses.  So now with that sorted, we should be good to go...
• It's the 19th our time.  The Kaimana Hila is still underway to the Shanghai port (currently nighttime for them as I write this), and the goods should be loaded on tomorrow.  The bill of lading lists Chicago as the destination port, although most shipments from China normally come in a California port.
• Significant progress is being made on an upgraded website.  Lot of groundwork still to cover, but we might just be able to have it "ready to go" when the inverters arrive...

All of my wires are less then 2 foot if that, some are a foot, and almost 90% of them are 0/2 awg.  I've try running the washer even at full battery power, and it the only thing running off the GS through a extention cord from the GS, same results. so no, its the GS not my battery, if a 12v PJ and a oddly name 3k pure sign invter can run my washer with no issue with one AGM 12v battery, then yeah go figure it out then. 

Everything else in my house runs fine, just the washer hates the Two GS I have. I'm hopeing replacing the control board to rev c when Sid gets time to make and ship them out that this will solve the issue.  This has been a issue since day one of getting my two GS, I love them, but hate that I can't wash my cloths with them, lol.

Order of GS MOSFET boards is completed & shipped.  .....   Professional  solder mosboard  looks good . .. I  will not trust Sean to solder that many .     Will Sean solder the capacitors to the mainboard  ?? .   

All I can say is....

LOL.

You funny.

I do not have the time to solder 2000 mosfets. I requested from an early stage that I wanted to have all the mosboards assembled elsewhere even if it costed more money (It does). The caps will be soldered by myself or sid. The legs on the caps are very large and there are only 5 of them. I have been getting better about soldering with skill and better solder gear as well as watching 50 youtube videos on different techniques. Soldering 4 caps, 2 in the case of the 6k, will be a breeze and can easily be tested for faults right after they are soldered to the board. The leaded solder and 600F solder tip will help not to burn the board or the caps but allow capillary action to make a good contact. We chose the current caps as they have more legs than a standard 2 leg cap which will add to their seat in the mainboard.

The alternative is to have a company do the work for us which will increase the odds they become damaged in shipping. The caps are very tall with nothing surrounding them to protect them against drops. We are exploring the possibility of having a company assemble the entire mainboard and shipping it to us as a completed unit but this first round the caps will be hand soldered. Sid will likely assist me in the first set of inverters. Keep in mind that he hand soldered 100 parts onto a rev C board.

The ship has left china and is in route to USA