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Author Topic: 240v to 120v step down help; litecoin rigs using gpu's  (Read 2336 times)

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Offline Joe CargoTopic starter

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240v to 120v step down help; litecoin rigs using gpu's
« on: May 22, 2013, 05:41:13 PM »

I am posting this question to the group in hopes of a more definitive answer.

And I should state that I am building for litecoin rigs not bitcoin

I am planning on building quite a few rigs. I am looking at this as more than just a hobby. I live in an older house and want to use a separate room for my rigs. After looking at my circuit breakers, I realized that a rig as designed on this website ( would pull about 5.83 amps, and since the room I'm going to use is on a 20 amp circuit breaker, I would only be able to get 3 rigs in the room before having issues. Therefore, I called an electrician who arrived and said that he could install 240v outlets in the room, and then with the use of a UPS system he could step down the system to 120v allowing me to get quite a few rigs in the room. I was aiming for 30 as a goal and he surpassed this by saying we could get 32.

I should state that upgrading my power box is out of the question. I have 150amp service and could upgrade to 200amps but not 400amps. My electrician states an upgrade of the service is not necessary.

OK, so obviously, this is a major project, but pick up your jaw and here's the rest pf the story.

I live in a place where the weather is very cool year round. i am not worried about heat issues because the high temp here during the summer is about 80* F. Right now, in May it's about 50 or so. The 80* might last 6 weeks at the most, so keeping the rigs cool is not an issue. A few fans, maybe a window air conditioner for the hot months and we should be fine. I'll cross that bridge when I get to it.

The problem is not the cooling but how to connect the rigs to the 240v and step them down to 120v.

My electrician suggested that I use a combined transformer/UPS system for the rigs. He has someone who I can buy these from but the cost is $5300 a piece...... And he said I would need FOUR of them.....Not cheap and I don't think I need to spend that much money. However, his product would allow me to hook up 8 rigs each for a total of 32 and protect them with UPS (as we sometimes have high winds and storms here which can cause brown outs and black outs). His specification was a 7.2kw UPS system (4 of them) that would pull 96 amps at the wall (total all four) at 240v but deliver twice that at 120v.

It sounds like a great idea, but the cost is well out of my comfort zone. On the flip side (and something I do like) his system is portable so that allows me to move everything. Since I only plan on being here for 3 years, this is a good thing.

So I have made a few suggestions, such as why not just have a step down transformer without a UPS? They are much cheaper, will do the same job, and you can always hook up a separate UPS to them or just a realy good surge protector.

Something like this:

newbielink: [nonactive]

hooked up to something like this:

newbielink: [nonactive]

or this

newbielink: [nonactive]

Anyway, you get the idea. I could probably do this for about 75% less than what he was saying and still protect my rigs.

However, I have not been able to find a tripplite or anything similar in the same configuration as what my electrictian was suggesting. He said 7.2kw and the tripplite above is 6kw and the highest I have found.

Does anyone have a better suggestion? I plan on building my rigs one at a time, over several months, and I've thought this through pretty thoroughly. I just need some logistical help, so please just give good suggestions, not reasons why I shouldn't proceed.

Thank you.


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