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1  Bitcoin / Mining / Re: Solar Powered Mining on: October 01, 2013, 01:59:06 PM
I've been on wind and solar for a year now for my property. I think someone here in this thread was mentioning using an inverter to run the mains adaptors. DON'T. just go 24VDC (or 12VDC depending on your setup) to whatever you need. DC to DC FTW.


+

Because it will be inefficient to invert and then convert back to DC.

Try using car cigarette plug with USB port to power 5VDC. And for 12V, as long as your battery is plugged to the line, the voltage will be stable.

Kinda what I was getting at between the lines Wink
I agree 12VDC is most efficient if you are storing your power in an off-the-grid mining setup.  However, the problem is that you must take into account the cost of 12VDC cigarette lighter adapters and shipping times. 
2  Bitcoin / Mining / Re: Solar Powered Mining on: September 30, 2013, 04:34:01 PM
UPDATE:  Ran out of power last night at about 4AM running three laptops (less than 10% cpu usage) 20 USB ASICS (two 5VDC stock power supplies), a 75 watt 120VAC fan and 7 12vDC fans. Shocked

That's using 2x 8D AGMS's that were fully charged by a 1500Watt solar array using a 1500Watt pure sine wave inverter. 

you should be able to do all the mining via a Raspberry Pi & hubs - why do you have so many fans & laptops?

Laptops & hubs?  I was just making sure it all could work... over the weekend I used one laptop and 20 USB ASICS for a total power draw of 150 Watt VAC.  The batteries were able to keep up after a full daily charge but the next day rain/overcast conditions caused me to run out of power again. 

Understanding the expense it cost to build this system vs the mining gains, solar is just too expensive because of the hardware needed.
3  Bitcoin / Mining / Re: Solar Powered Mining on: September 27, 2013, 08:56:44 PM
UPDATE:  Ran out of power last night at about 4AM running three laptops (less than 10% cpu usage) 20 USB ASICS (two 5VDC stock power supplies), a 75 watt 120VAC fan and 7 12vDC fans. Shocked

That's using 2x 8D AGMS's that were fully charged by a 1500Watt solar array using a 1500Watt pure sine wave inverter. 
4  Bitcoin / Mining / Re: Solar Powered Mining on: September 27, 2013, 12:48:50 PM
going off topic here a bit but....

i have some old car audio bats/caps sitting around i'm wondering if they would be of any use .

specs for battery i have 1 of these.
Kinetik Hc2400 Power.
http://www.kinetikpower.com/2009/product.asp?C=1&P=KHC2400

have 2 of these.
http://www.kinetikpower.com/2009/product.asp?C=1&P=KHC600

i'm wanting to go with 100ish watt solar panels and dont mind a diy project if it saves some cash.

should i go with the 2400 or two/one of the 600's or all of them?

ballpark figure using my current batteries and getting something like this up and running ?

500-600 would be what i wanna spend if its possible?

i also have one of these http://www.amazon.com/Goal-Zero-12401-Nomad-13-5M/dp/B003S02HOQ/ref=sr_1_12?ie=UTF8&qid=1380278975&sr=8-12&keywords=portable+solar

  i may mess around with it if  i get a raspberry and a usb miner anyone here tried that ?



Connect all the batteries together, in parrallel.  Just like you would do in a car audio application.

You do need a solar charge controller and I would recommend buying one 100 watt solar panel first to ensure this is something that will work for you.  Spend your time fusing it all correctly.

Finding the right place in your home/garage will take most of your time.
5  Bitcoin / Mining / Re: Solar Powered Mining on: September 26, 2013, 01:15:26 PM
The batteries i plan on using are old APC 2200 UPS batteries - i have potentially 16 of them - so i basically need solar panels and MPPT controller + cables and a way of converting my USB hubs to take power from the batteries rather than mains...

Get started now then, hook those batteries up in parallel and charge them up (automobile trickle charges are great for this and cost very little).

Then make a trip to the automotive store and pick up some cigarette lighter sockets and some of those cigarette lighter/USB chargers.  I use 4 of them right now to run my hubs. 

Finally, wire it all up and see what happens!  You will get a good idea of the power needed to do what you are planning.

============
Look up 20AMP MPPT controller on Ebay, they have some good deals on low end units from China right now.  I have used them but caution not to put more than 400Watts of solar panels on them as they tend over heat and make lots of smoke when they fail.  Roll Eyes
6  Bitcoin / Mining / Re: Solar Powered Mining on: September 26, 2013, 12:28:43 PM
The idea was for a 20 x USBMiner and Rpi (or netbook) basically less than 100w continuous draw i dont know the exact figures but i'd guess 20 miners and an Rpi is around 50w (adding a netbook would add at least 60w)

at current difficulty i would expect it to be about 0.02 BTC per day.

100w continuous draw?  Then you would need at least 250w of solar panels less than 50ft away (assuming you will be using 8awg transmission wire, or less) and an 8D AGM battery.  I strongly recommend a MPPT controller as well.   

Of course for cloudy and rainy days, you would be wise to get 400w of solar panels to make up for the lack of direct sunlight and let the MPPT scrape on the leftovers.
7  Bitcoin / Mining / Re: Solar Powered Mining on: September 24, 2013, 03:39:42 PM
here is a challenge then guys lets build/design a 24/7 solar mining setup for 20 ASICMiners + Hubs + RPi/laptop that is self contained.

Challenge accepted!

Two year Bitcoin and Litecoin miner here that has been lurking on the forums until now.  I am a 15 year veteran coder and a 13 year SETI at Home cruncher.  My computer hardware and experience is extensive so imagine my surprise when I found it could be used for mining.  The rest is history!

I currently have a 1500 Watt Polycrystalline solar array that was built by hand over the past 3 years ago in my backyard.  The system can supply 200 watts of power for 24 hours assuming no sunlight is coming in.  My system is called Off-The-Grid because I need it to supply power in case of a hurricane.  Total project bill so far has been approximately $5,000 which is all material costs because I do not have to pay consultants.  Currently, my vulnerabilities are lack

If you would like, I can provide photos and technical discussion of the build and where it goes from here with ASICMiners but feel it might stray of the current topic so I choose to reserve until asked.   Grin

Yes, I have ASICMiners coming and am converting the computer side of the system away from Litecoin.  Again, please ask questions and I will answer.  For example, my computer systems on the solar array are mostly laptops because they can plug right into the 12VDC battery banks and draw much less power this way!
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