Electricity backup for antminer's

[rathoretx5]

Hello everyone i just bought two antminer s7's. Where i live, i have to pay very less for electricity. But the problem is the electricity uptime is very poor here, i face 5 to 6 power cuts a day with around 40 minute to 1:30 hours. I want to ask what kind of backup power should i use. i am thinking about getting a 3kva inverter. Please suggest me other options.

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[Gabrics]

Inverter is not a power source, it is just an inverter. I guess you meant solar panel and inverter?
That is way too expensive and no guarantee that the sun will be "working" when there is no power.

I advise you to just enjoy when you have that free electricity and "suck up" the no electricity periods as cost of doing business there.

If you can get free gasoline too you can get 3-4KW generator, but I wouldn't.

[Erumara]

Inverter is not a power source, it is just an inverter. I guess you meant solar panel and inverter?
That is way too expensive and no guarantee that the sun will be "working" when there is no power.

I advise you to just enjoy when you have that free electricity and "suck up" the no electricity periods as cost of doing business there.

If you can get free gasoline too you can get 3-4KW generator, but I wouldn't.

Agreed, fueled generators are almost going certainly going to cost you more than it is worth to keep them running. You need a battery backup/inverter system to charge while power is up and discharge when it goes out.

Lithium Ion batteries are the only real option, I did a lot of research into viability of battery backup and it is unlikely to be worth it.

10kWh battery = ~$3000usd (I've seen some cheaper on alibaba)
Inverter = ~$600usd

Backup power (2 s7's @ 1250W ea)= ~3 hrs

Keep in mind they take time to charge up, if you're suffering clusters of outages (I would assume so, during peak usage periods) they're usefulness will be decreased even more.

[notlist3d]

Hello everyone i just bought two antminer s7's. Where i live, i have to pay very less for electricity. But the problem is the electricity uptime is very poor here, i face 5 to 6 power cuts a day with around 40 minute to 1:30 hours. I want to ask what kind of backup power should i use. i am thinking about getting a 3kva inverter. Please suggest me other options.

Chances are you will be better off looking for a hosting center vs something that can power 2 S7's for up to 1.5 hours a day.   Your just talking about a lot of watt's and a long amount of time. 

If you look at battery backups I think you will see cost of one that is capable of this just will not pay off. It just will not make sense financially buying a system capable of doing what your looking for.  Also what country are you in?   Just curious with losing power so much.

[smaxz]

just go door to door at your local warehouses and see if anyone is replacing their forklift batteries anytime soon.

offer a bit more than scrap value, or less but arrange pickup (or disposal)

most employees are just happy they dont gotta operate the machinery to replace or remove these units and they are decent at holding a charge for home or modest industrial backup purposes.

[bitcoinbarron]

just go door to door at your local warehouses and see if anyone is replacing their forklift batteries anytime soon.

offer a bit more than scrap value, or less but arrange pickup (or disposal)

most employees are just happy they dont gotta operate the machinery to replace or remove these units and they are decent at holding a charge for home or modest industrial backup purposes.

Thats a good shout, I would probably buy an old APC UPS off eBay that has got dead batteries, then wire up the UPS to the old industrial batteries and let it do the work.

It will then kick in when the power fails and automatically recharge when it goes back on again.

[notlist3d]

just go door to door at your local warehouses and see if anyone is replacing their forklift batteries anytime soon.

offer a bit more than scrap value, or less but arrange pickup (or disposal)

most employees are just happy they dont gotta operate the machinery to replace or remove these units and they are decent at holding a charge for home or modest industrial backup purposes.

Thats a good shout, I would probably buy an old APC UPS off eBay that has got dead batteries, then wire up the UPS to the old industrial batteries and let it do the work.

It will then kick in when the power fails and automatically recharge when it goes back on again.

I think it's going to be hard in most cases to get a UPS/Used battery combo for a decent price.  Keep in mind were talking running up 2800 or so watts for 40 minute to 1:30 hours.  So that is a good amount of energy that needs stored.

So good idea looking for lower cost solutions.  But I still think you will pay more then what you make over that 40 minute to 1:30 hour per day.  Just a lot of cost for not a ton of pay I'm guessing in almost all cases.

[Amph]

easy answer is apc ups but you need the big boy with 2200 va, the SMT2200I should be ok

it has a pure sinusoidal wave with lcd, can sustain 2kw for 30 min

[jermwerty]

There is no use in using a battery backup for loads like miners. 

According to APC.com you would need:

APC Smart-UPS SRT 5000VA 208V + (4)SRT192BP Battery Unit  (calculated runtime  @ 2800W is 126min)

So you would need $4,000 + 4x($1,000) or basically $8,000 worth of APC UPS gear to "do it right".

Also, with that many regular power outages plan on replacing batteries often!

You can "homegrow" your own solution, but batteries will need constant replacement and the reality is UPS is just not worth it!

[notlist3d]

There is no use in using a battery backup for loads like miners. 

According to APC.com you would need:

APC Smart-UPS SRT 5000VA 208V + (4)SRT192BP Battery Unit  (calculated runtime  @ 2800W is 126min)

So you would need $4,000 + 4x($1,000) or basically $8,000 worth of APC UPS gear to "do it right".

Also, with that many regular power outages plan on replacing batteries often!

You can "homegrow" your own solution, but batteries will need constant replacement and the reality is UPS is just not worth it!

It is a case of the cost of keeping it operating just is not worth it due to earnings.  Even with "homegrown" I think it will take a good amount of time at 40 to 1.5 hours a day to pay for setup.   We just don't see people doing this due to costs.

OP what country are you located? And if I can ask what is your electricity price? (asking due to power cuts)

[smaxz]

he's probably trying to save his hardware from the stress of these power spikes and losses. not just getting that extra time of mining in.

if a ups system facilitates his ability to mine, sure its worth it with the right electricity cost. just be resourceful about it.

you can fry equipment pretty quick exposing it to that kind of environment.

[miningdude]

maybe you should use cloud mining because the electrics will cost a huge tax when using btc miner antminer and others.

[DrG]

maybe you should use cloud mining because the electrics will cost a huge tax when using btc miner antminer and others.

The only winner with cloud mining is the cloud mining company.  It also promotes centralization. No point in supporting it when the OP is willing to support decentralization.

[karmenali]

Mining is dead. There is a lot of variable on the financial. Price , electiricity , diffuculty ....

[vapourminer]

no, daisy chaining cheap UPSs doesnt work to extend run time. their power output (stepped sinewave) is not clean enough, the 2nd UPS will consider it too dirty and will go to battery itself.

just get  properly sized UPS to begin with.

UPS batteries only last a couple three years anyway if they are used a few times a month like mine are. crappy power here at the end of the line. so the used office ones probably have hardly any capacity left.

[buysolar]

What's your budget? These days there are many great battery backup options available. Are you more of a do it yourselfer looking for a high intensity workout or would you prefer plug and play? Right now the cheapest most reliable short term option is probably going to be off the shelf deep discharge lead acid batteries with a top tier grid interactive inverter either xantrex, outback or sunny island (I've had great results with all 3 products). If you want to go high end for the long term investment, I'd go with Sonnen they've integrated a really sweet product incorporating lithium iron batteries (that just can't be killed) these are the type of batteries that will last you the rest of your life. The cheap option I'm recommending starts at just around $2,500 and can be scaled to any size that you would like. the high end solution starts at about $10k and can be scaled to any size you'd like.
I design and build alternative energy systems for people.
I installed my first solar powered bitcoin farm in 2012 which I expanded to a ~100kw solar powered bitcoin farm earlier this year.   

[Kendji]

you should see someone who has a knowledge on electricity

[philipma1957]

based on the op he is not usa based.

so even if he gets used forklift batteries he needs 2 big ups units.

I know of a ups sell in the usa that will sell refurbs cheap.

but that is a usa seller won't help him at all.

[smaxz]

so is op's two s7's still hashing away?

power outages included?

or did you find an alternative solution to the ups issue.

[tolip_wen]

Hello everyone i just bought two antminer s7's. Where i live, i have to pay very less for electricity. But the problem is the electricity uptime is very poor here, i face 5 to 6 power cuts a day with around 40 minute to 1:30 hours. I want to ask what kind of backup power should i use. i am thinking about getting a 3kva inverter. Please suggest me other options.

Most ASICs(the actual chip that does the work) run on less than 1VDC but very very high current.
Most 'miners' operate on 12VDC.
Most power company power is over 100VAC.

A UPS looses over 10% of the power input to charge the batteries.
It looses at least another 10% when making AC from the stored battery power.

A typical Platinum 12VDC power supply looses ~10% making 12VDC from the wall voltage.

If one were to find the 'best' option, it would probably be to power the miner from 12VDC batteries directly during a utility outage.
If you want your backup to survive more than 1-2 outages you could to plan on having DOUBLE capacity available.

Even with the best available option it may not be a good idea.

YMMV