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Yeah, if you arent comfortable wiring things yourself you should definitely call an electrician.
You have access to 240V, so you absolutely should take advantage of that. Look into 240V 30A PDUs on Amazon and eBay, they're a great way to power a lot of gear with a single 240v 30A outlet. They usually have a twist lock plug, and a bunch of outputs for power supplies. That's the best way to go in my opinion.
Have you already ordered your 15 SP20s? Do you already have power supplies to hook them up?
Have you considered how you will connect them to the Internet? I'd suggest either a power line ethernet adapter from your router or a wifi bridge to a 16 port network switch, or more ports if you plan on expanding in the future.
As for the Texas heat, you'll want to have a good ventilation setup. You need to figure out how many qubic feet your garage is, and use a powerful enough fan to change the air in the garage every minute or so. For example, if your garage is 1000 qubic feet you'd want a fan rated at 1000CFM (cubic feet per minute) to extract the heat and dump it outside of your garage. Air conditioning is also an option, but much more costly with the electricity it will consume.
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Well, assuming he's either in Canada or USA, he's got 240v running to his main panel. All homes do. Where do you live, youngkenzie? philipma, are you saying you've got 5 separate circuits running to your garage? IE 5 breakers and wires?  I really doubt that's the case. You must have one 240v 100A breaker in your main panel in your house, with a single 3 AWG copper or 1 AWG aluminium cable running to a sub panel in your (detached?) garage. From that sub panel, you'd have 5 20A 120v breakers. Correct? Having 5 separate runs to your detached garage would make no sense at all. If the garage is attached to your home you probably wouldn't have a sub panel, but 5 20A runs is still a little odd to me. Don't forget that your wires don't care if they're running 120V or 240V, it's all the same to them. A 120V outlet can be easily converted to 240V, just need to swap the breaker and outlet for the appropriate 240V spec. No need to run a new 80' wire, you reuse the existing wire. All my mining is done from home with a 200A service, and every miner I have runs on 240V. I started off using 120V, but it's just too inefficient. I quickly switched to using 240V, as I simply wouldn't be able to operate my household normally mining on 120V considering heavy hitters like the oven, clothes dryer, water heater, etc. Another nice trick I've used in the past is using existing 240v circuits for baseboard heaters. No need for them with miners.  Just need to bypass the thermostat. |
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You don't want to use 120v for that many miners. Wire a few 240V 30A lines. You'll save on wire cost, your PSUs will be more efficient and have a longer lifespan, and you'll only use half the amperage from your panel VS 120V.
Each 240V 30A circuit can provide 5760w safely vs 2880w on a 120V 30A circuit using the same wire size. (10AWG) It's a no brainer.
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I have searched and read through many pages of this thread but I think it might just be easier for me to ask.
What should my voltage be if I overclock my S4's to 225M and higher? Thanks
0725 is fine for 225, some units will also work at 0720. You can't go above 225/0725 with the PSU included with the S4, you will overload it. I measured 117A of current from the PSU at 225/0725, and it's rated for 120A. |
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Cool, so an increase of about 1.4MH/s per blade can be expected. Have you measure what the increase in power consumption is?
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You're solo mining with 200KH/s?
Do you get accepted shares when pool mining? Or just rejects?
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Put the overvolted board on 1400 MHz. Has been running for over 22 hours and produced only  34 HW errors. The other board at 1300 MHz produced 591 HW errors, and if I put that board on 1400 I effectively cripple it. Wow, that's great! Might have to do the same mod, I have 1 88MH unit and 1 60MH unit. Good job! How fast is the blade hashing at 1400mhz? |
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Speaking of pypy, I was wondering what the verdict was. I have plenty of RAM available. Is the switch fairly painless? I'd like to give it a go, but I also don't want to mess anything up with my Linux noobishness.
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OK, so it's not just me. Thanks for testing this out! Feel free to keep mining with me on my node, BTW. P2Pool pays better than any other pool, by a small amount. If you don't want to mine with p2pool I'd suggest sticking around until you at least get 1 share, that way you'll earn something from your testing. |
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M's Miner Monitor is the best way:  You can also ssh (use putty with Windows) into the miner, type "screen -r" and then press "s" and you'll see the current settings for queue scan-time and expiry. Press ctrl+a+d to get back to command line. Judging by your reported hashrate, you're running 8192. Try setting it to 0 or 1 with the other method I mentioned, and let's see what happens to your hashrate. After that, I'd suggest trying 218.75mhz, which seems to give me the best result now with this firmware and p2pool. Confirmed those flags don't do anything now in the password field I will go in and edit the file and see what happens Yeah, that's what I thought. They didn't work with the previous firmware either for me. Wouldn't it be great if we had an active Bitmain employee in these threads to help out like Spondoolies does? |
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M's Miner Monitor is the best way: You can also ssh (use putty with Windows) into the miner, type "screen -r" and then press "s" and you'll see the current settings for queue scan-time and expiry. Press ctrl+a+d to get back to command line. Judging by your reported hashrate, you're running 8192. Try setting it to 0 or 1 with the other method I mentioned, and let's see what happens to your hashrate. After that, I'd suggest trying 218.75mhz, which seems to give me the best result now with this firmware and p2pool.
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The 1300 G2s can handle 2 SP20s without any issues. We've run them up to 1400W constantly at the wall back in the GPU days. Just make sure it's not too hot in the room and it's all good to go.
Eh, even if it's hot, they're tanks. They're rated for continuous 1300w output at 50c ambient. |
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I put in a difficulty of 2250 which is the same as what I use on CKPool lets see what happens now also I removed the scan-time and expiry options now the password field is just
x --queue 1
I use 2250 also. Are you sure adding --queue 1 to the password field works? I tried it after you suggested it in the other firmware thread, but it never actually applied it. Was still running 8192. With this new firmware, you can change queue by editing /config/user_setting through ssh or putty. I set mine to 0 and it is persistent across power downs. Are you running 200mhz, or overclocked? |
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Installed the new firmware on a few of my S4s, very glad to see an update for them from Bitmain.
Performance on p2pool is completely messed up, though. 225mhz hashes at 1950gh/s instead of 2225gh/s with the previous firmware. Strangely enough 212 and 218mhz works much better than 225, reaching about 2180gh/s at 218mhz.
Testing on ckpool right now, seems to work perfectly at 225mhz. Anyone know what's going on?
I am running 225MHz and its showing the same speed as with the old firmware...all my S4 are running 240v so I cant tell you what it uses at 120v but I know it is way too damn high for my liking hence the reason for 240v in the first place...on 120v 15a circuit it used around 13 or so which is above the safe range...my rigs are also on ckpool Did you reset to defaults when you flashed the firmware then re-do your settings or leave the box ticked? I unticked the box just to be on the safe side after all it only takes a minute to reconfigure and you know for sure its using ALL of the defaults for that firmware as a result I only had a couple of casualties so far in the upgrade process...1 S4 upon reboot had -------------- across a board so I power cycled it and that was the last of that....turns out something toasted the SD Card as I put a different one in and its fine; the one I pulled out does not even get detected now so its definitely shot On a different miner no matter what it didn't take the firmware upgrade even though it says it did...date still oct/2014 and when I pulled that one out afterwards to see whats up I got a message saying write protect was enabled on the SD card and it definitely was NOT enabled....re-imaging the SD card fixed that although when I tried using SDFormatter it refused to allow it going on about write protection...I am going to give it another shot to see if this issue can be reproduced..hopefully not  I'm also running on 240v, 120v is for peasants lol. (Just kidding all you 120v peasants  ) But yeah, the issue is really only with p2pool with my machines. They work perfectly with ckpool. Mind pointing one of your rigs at my p2pool node? Or any other p2pool node for that matter. I'd like to see how your S4 performs vs mine. Address: 69.157.250.207:9332 User: yourbtcaddressasusername Password: x edit- 1 machine is pointed at that IP and I noticed just using x for password it starts the difficulty a lot lower than using x --scan-time 1 --queue 1 --expiry 1I just rebooted it to get some clean numbers Cool, thanks. If you want to specify a difficulty with p2pool, add +2048 to your address. For example: 16oAG2yWnWFufgVPLaCZpVWnmgXukswRE4+2048 I'm trying with queue 0 instead of 8192 right now, 218mhz. Seems to work a lot better. You can monitor your miner here: 69.157.250.207:9332/static/p2pool-node-status/ |
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Installed the new firmware on a few of my S4s, very glad to see an update for them from Bitmain.
Performance on p2pool is completely messed up, though. 225mhz hashes at 1950gh/s instead of 2225gh/s with the previous firmware. Strangely enough 212 and 218mhz works much better than 225, reaching about 2180gh/s at 218mhz.
Testing on ckpool right now, seems to work perfectly at 225mhz. Anyone know what's going on?
I am running 225MHz and its showing the same speed as with the old firmware...all my S4 are running 240v so I cant tell you what it uses at 120v but I know it is way too damn high for my liking hence the reason for 240v in the first place...on 120v 15a circuit it used around 13 or so which is above the safe range...my rigs are also on ckpool Did you reset to defaults when you flashed the firmware then re-do your settings or leave the box ticked? I unticked the box just to be on the safe side after all it only takes a minute to reconfigure and you know for sure its using ALL of the defaults for that firmware as a result I only had a couple of casualties so far in the upgrade process...1 S4 upon reboot had -------------- across a board so I power cycled it and that was the last of that....turns out something toasted the SD Card as I put a different one in and its fine; the one I pulled out does not even get detected now so its definitely shot On a different miner no matter what it didn't take the firmware upgrade even though it says it did...date still oct/2014 and when I pulled that one out afterwards to see whats up I got a message saying write protect was enabled on the SD card and it definitely was NOT enabled....re-imaging the SD card fixed that although when I tried using SDFormatter it refused to allow it going on about write protection...I am going to give it another shot to see if this issue can be reproduced..hopefully not I'm also running on 240v, 120v is for peasants lol. (Just kidding all you 120v peasants ) But yeah, the issue is really only with p2pool with my machines. They work perfectly with ckpool. Mind pointing one of your rigs at my p2pool node? Or any other p2pool node for that matter. I'd like to see how your S4 performs vs mine. Address: 69.157.250.207:9332 User: yourbtcaddressasusername Password: x |
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Installed the new firmware on a few of my S4s, very glad to see an update for them from Bitmain.
Performance on p2pool is completely messed up, though. 225mhz hashes at 1950gh/s instead of 2225gh/s with the previous firmware. Strangely enough 212 and 218mhz works much better than 225, reaching about 2180gh/s at 218mhz.
Testing on ckpool right now, seems to work perfectly at 225mhz. Anyone know what's going on?
I'm running the new firmware on my 4 S4s @ 200mhz/0700v. HR on S4 GUI is reporting as ~2.1-2.3TH/s (5 seconds) ~1.98-1.99TH/s (Avg) and p2pool reporting HR ~8-8.5TH/s Avg HR ~7.6TH/s for 4 S4s. DOA ~2-3% Any chance you could try overclocking one of them to see if you have the same problem as I do? The stock PSU is good for 225/0725 max, which pulls 117a from it and it's rated for 120a. |
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Are you shipping from US or Canada?
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I'm not sure how many, but send me a PM once you receive some.
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