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Old 04-03-2014, 08:19 PM   #16
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Thanks for all the information. I was looking into pure sine wave inverter from the start. A 5kw one does seem like a better fit. I am thinking that I would need 10gauge wire to hook that up right? Just want to double check I know 10gauge will do 30amps or would I need to used 6 gauge? I think that's rated to 80 if I remember correctly. As for batteries I found some pretty good 200ah deep cycles for a reasonable price. I was thinking of a 24v system because it would mitigate me having to use 0000 gauge cables for battery hook ups. That would give me about an hour of run time. Maybe a little more if I am willing to go to 20% charge which I would rather avoid. The generator idea is good and I do have one but I hate having to run outside and power it up and a lot of times the outage last less than 20 minutes. Usually if its over 20 minutes we are out for at least 8 hours. With a 1 hour run time I would mitigate like 80% of my trips to the generator. I use a 3500w generator and it seems to run things fine. I connect a PC ups to the fridge whenever I run it since it outputs a modified sine wave. I wish I could just wire up a rack Mounted ups unit into the system and be done with it.


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Old 04-03-2014, 08:32 PM   #17
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Hard wired UPS's are available.

If you intend to use this for less than an hour why even bother with the refrigerator/freezer? They can go hours and maintain temperature. Then you could get by with a much smaller unit, at much lower cost.

I wouldn't bother with the UPS for the fridge. It'd be much happier even with a "dirty" sine wave than a "modified" one.
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Old 04-03-2014, 09:13 PM   #18
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Yeah, blocks of ice are a much better "UPS" for a freezer in the short term. This sure seems like an expensive and inefficient alternative to a generator. The purpose of a UPS is to provide instant changeover for loads that can't go down at all, like servers. Most built-in UPS installations use the UPS as a very short-term bridge between utility failure and generator startup.


I am a lawyer, but not your lawyer. And who cares anyways? We're here to talk construction. This is DIY advice, not legal advice.
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