I'm unable to sell back also. As long as your load exceeds your maximum production potential, at all times, you can use grid tie and never back feed. That is how I can run solar gear and grid tied inverters with no contracts, permits, inspections, and barely any install costs; by doing it myself super cheap. Everything has to be synced so that power is coming from same phase in breaker box as solar inverters are feeding into, now power company never sees the solar production, just the varying constant load from the miners.

I'm running 10kW of mining gear and ~5kW of grid tied solar. Solar supplies about 10-15% of total daily consumption, in Florida. Realistically, I would need more than a 50-60kW solar array, at minimum, to cover 240kWh daily use. So you either need a shit ton of expensive battery or are going to be grid tied, back feeding to power company most of your generated power, only to buy it back later at a higher price. So you need at least ~6X in solar what your intended load will be if located in a 4 sun/hr geo zone.

High heat, high humidity... fun times were had, but it worked.

My ghetto array set up..

S7's heating up some seedlings for garden.

I ran a dozen S5's mounted to exhaust out of window inside a shed, the other window was open to let fresh air in. Wind tunnel shed! They ran great, even when ambient temps outside broke 100F. Loud! Did it work? Yeah. Do it again? Yeah, but it seemed wrong, very wrong..

I've had issues with the bitmain psu that caused similar results. The wires connecting the psu fan were coming loose, fan would stop, psu heated up and eventually goes to thermal fail safe till it cools.

so much wrong with that pic. #3 fan is out, asic count is off, temp sensor no go. I would check that the boards did not shift around in unit. check them to make sure they are tight fitting and not loose, and double check that fan wires are attached. I had one show up that must have been tossed around a bit, cards were loose and results looked similar to yours until I discovered problem and re-seated them. POS power supplies also create issues like that.

edit:  i quoted wrong pic..lol

edit: im not even trouble shooting the right equipment...doh thought it was S7  ...going back to bed

Had 2 of 4 units show up that perform slow and can't seem to run any faster than 4.75TH. At stock 600 they performed very close to what you describe, they ran at a max of around 4.6.

I down clocked to 593 and now they run faster than when they were at 600.

The 2 units that perform nicely run at 4.8 all day at 600 but will run at 5TH if clocked to 625. Temp does not seem to ever come into play. They will only run so fast regardless of clock speed and ambient.

The 4.6 units will run at top speed of ~ 4.75 when clocked appropriately, the 4.8 units will run up to ~ 5TH.

I adjusted the math. you need to find your sun hour zone to calculate annual average daily sun hours. I am in Florida and receive just over 4.5 hours on average.

~7kw*( average daily sun hours) = X kwh/day (~$ Z)

~4.5kW (4.5h) = 20.25kWh/day

At current difficulty and my averaged mining efficiency of .33W/GH, 1kW will run ~ 3Th of gear and will result in ~$.25 in BTC being generated per hour. So my solar setup, on average and at current BTC price and difficulty, earns 20.25kWh($.25) =  ~$5/day.

or something like that...

I have been adding panels and inverters to my solar setup for years now. It's a pretty low budget setup. That's why I have many smaller grid tie inverters versus one larger one. Usually I buy a few panels at a time and wire them up.

Everything was purchased with the ROI from a couple dozen ztex and other fpga boards that I ran years ago, including current mining gear.

The pictures of my power sipping fpga and early asic setups are somewhere in this thread

The inverters shut down if power goes out. Im not using any battery backup. The solar only offsets a fraction of my overall power usage, never makes it onto grid.

latest setup. Running around ~27TH of gear and have 4.5kW of solar panels on grid tie inverters.

I had good luck modding cheapest hubs I could find at the time. Shelf board with all the hubs attached is available if someone is interested, make an offer, its heavy.

Thanks for the info!

I have same problem on two separate orders placed earlier today. Both are confirmed on blockchain yet order is expired on bitmaintech.

Sorry, idling on #eruptorhub, waiting to peddle my wares...heh

I have several lightly used 10A 5VDC DIN mount power supplies I would like to get rid if.

The price i'm asking is .15BTC + shipping anywhere in US.

I can also supply a limited # of modified 10 port hubs like those that I use in my own setup. Those I will sell for .10 + shipping, they will handle 5A easily and are tested for such.

I will also sell entire mining setups that include a minimum of 10amp PSU, 1 configured raspberryPI, SD card, 1 fan, 2 modified 10 port USB hubs, and 19 usb eruptors. Make private offer.

I'm on freenode irc if you have questions, I may not see PM on forum for a day or so.

pic with new 90 amp power supplies, brought price per port to less than $2

Great point about the red wire and back feeding power to hubs if one psu goes down.

Today, I am switching over to 90 amp psu's and using the 10 amp models to power small 6Gh/s (18 eruptors, 1 fan, 1 wifi stick) rPi units.

With barrel connectors, I found the screw terminal ones from amazon to be garbage at higher amperage, eventually burning out and sometime melting apart in the process. Most likely you can use any connector that is crimp or soldered, or premade (as long as it's a decent wire thickness). It wasn't the female aspect of connector on hub that shit the bed, it was my cheap male ends, so soldering leads directly to usb pcb is most likely overkill and not needed if quality wire and connectors are used.