FWIW, couple findings and resources to share - hope will save other's on research time and install hassles.
We (wifey EEngr & self) have brought up first install, and not thorough tested, but do have Kohler cabinet lights up, gives status, and 7600-BP w/ ATX , shows all status OK in base s/w config and clearly can 'talk' to the Kohler battery (100v-125v) stack. Sierra wireless 'hub' for Electriq proprietary cloud is powered from 24v, but we're connecting nor do we see a wifi (perhaps a 5g).
All Inverter status lights appear fully operational, so far so good. No "magic smoke" is always a plus: no more electrons = bad. When started, no guarentee GoodWe / Kohler combo kit would produce AC out.
Charging is functioning, battery indicator on cabinet & Inverter show good. Using a small 1kw 125v string & denotes increasing state of charge after couple days, with output of 120 ac at inverter backup lugs checks out and associated status LED's all look operational. There are still many of these Inverters & Kohler battery stacks listed at online outlets over $3k for Inverter alone (+ $600 for the ATX) . Couple these Resell surplus, can get one complete 900$ or so via Craigs & eBay folks (NIB). Personally, have not seen a better option for $100/kw CATL in a top shelf install set with 'english' documentation, a nice enclosure & snap in cabling for all mates.
These (1) & (2) points & findings on high volt setup with GoodWe will be moved to new thread, out of 'sales', into Hybrid inverters forum section.
(1) Base Install, findings, recommendations - The main cabinet 2" punchout over to inverter 1" , requires a mash-up to connect. Used 2" to 1-1/4" reduce washer, then 1-1/4" liquid tite flex to a custom plastic 'home depot' box, then split to two separate 1" flex (one for com plus ground, and one for +/- power leads). Sadly all routing from cabinet to inverter will not fit a single 1-1/4" (com plug is large). The 1:2 split was a generic box, hole saw drilled. The battery enclosures stack wall brackets are great, & solid, but do not have "uplift" lock on the battery cabinet. If you are in seismic 4 area, best be certain include at least one hold down, or it's gonna bounce off mounts in a shaker. Used 8AWG strand copper THHN for Inverter to ATX, using tinned end, rather than a crimp ferrule, as there was not any crimp fittings which fit properly to ATX . Install Spec states to 6AWG max to ATX.
(2) WiFi connectivity, dongle & cable, configuration, Solar Go, etc. -
Stated to me on phone by others, haven't been getting Wifi going after wiring up. Some cases, I suspect they didn't check board to see if WiFi was installed or not. The 7600-BP has a open, board male 5 pin , for the cable to USB receptacle (which WiFi dongle requires). Mine (7600-BP) had no connector, nor WiFi, so S/W customization or any setting changes are not possible (yet). GoodWe Connector is a Amphenol(?) standard (board to dongle), and GoodWe OEM setup with dongle to outside enclosure will be water tight IP66 if follow that OEM route. Likely , a cheap Amazon substitute is fine on install that's not water exposed. I'm waiting on a GoodWe WiFi dongle in shipment; however, will try a generic WiFi in the next few days after cable arrives. I'd bet a standard WiFi dongle will talk on this USB port On 7600/9600 ES-US as stated to me by rep, has WiFi already built in. Not sure about my ES config (without "-US" spec), as haven't checked it yet.
Example Amphenol on DigiKey for WiFi to connect off the board 5-pin to USB Wifi (or 5g) dongle, similar to this, but not exact equivalent spec (shows a USB B, dongle uses USB A):
Order today, ships today. UB-20PMFP-LC7003 – Cable Assembly USB B Female Receptacle to Rectangular 5 pos Plug 0.16' (50.0mm) from Amphenol LTW. Pricing and Availability on millions of electronic components from Digi-Key Electronics.
www.digikey.com
Similar Amazon connector, tho not water proof (ed - this pin space wasn't the same as on 7600 board, will solder in a molex connector):
https://www.amazon.com/dp/B06Y5KZC9W?ref=ppx_yo2ov_dt_b_fed_asin_title
Could try this route for bit over $10, may work. I'll update after my bits arrive (have 3 cables, 2 dongles inbound).
(3) eBay & Craigslist sellers -
I'd estimate 1000 units or more, full systems, are out there from Electriq bankruptcy. Multiple 1000's of proprietary firmware inverters are now "bricked" by servers going dark (there's a business opportunity). At a price point $100/kw-hr & $1k for 10kw complete 4-pack & cabinet & cables, and Inverters at $650-900., a rebuild of the battery to low volt, is only of academic interest to most. Really must have a strong "need" to rebuild these, as they are great out of the box as designed high volt. Suggest if doing a new system, might as well get GoodWe or other high-volt inverter - punt on rebuild to 48v. These can be set up and running in a day, ultra clean. There are advantages to high-volt setups. I've got larger legacy 48v systems running, so 48v is of interest, but only because my case are embedded complex builds ( 3 systems, > 6 charge controllers, OB Flex & MidNite, Outback & SMA & Trace/Xantrex inverters).
John T, in SF Bay area on Craigs has large warehouse & lots product (panels, inverters, cabinets, batteries); he's a good straight up seller, very responsive and easy to coordinate. Cash & pickup, in / out in 15 minutes. Have picked up 2 systems. Panels are by the full pallet.
In farther SF East Bay, eBay seller "cudean" & "4yourbusiness" were responsive to questions, but haven't purchased there directly. "4yourbusiness" stated in DM that WiFi is up & working for config "SolarGo", and has inbound supply of WiFi connexn kits - that'd be last mile closure awesomeness.
YMMV.
Going fwd, pls post comments / replies to new thread forks started. good luck