some quality transformer inverters are now available at a reduced price, typically for about half of what a transformerless one costs. so if i could buy a transformer inverter for about $750 vs. a transformerless one for $1500, is it worth saving the $?
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transformer inverter vs. transformerless inverter - worth the savings?
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You'll have to add additional external equipment to meet current codes. Not worth the savings IMO. -
Originally posted by adoublee View PostYou'll have to add additional external equipment to meet current codes. Not worth the savings IMO.Comment
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What electrical code? This is not meant to be insult but if you do not know the protections that might be missing from said old stock inverters being dumped into the market, you probably shouldn't be using.Comment
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Originally posted by adoublee View PostWhat electrical code? This is not meant to be insult but if you do not know the protections that might be missing from said old stock inverters being dumped into the market, you probably shouldn't be using.Comment
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Transformerless are not near as robust and good as ole Boat Anchor Transformers. With a Transformer you have Galvanic Isolation which can save your home and life. Each has pros and cons.MSEE, PEComment
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Originally posted by ButchDeal View Post
are you required to meet NEC 2014?
or rapid shutdown?
Also are you sure it has AFCI and not just GFCI?
the panel might support both. i checked the manual and saw the replacement of the gfci fuse in the panel. the advertising shows afci. it meets 2011 nec.
the consideration of transformer inverter is for the second array to be finished next year & the third array in 2019.Comment
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Originally posted by Sunking View PostTransformerless are not near as robust and good as ole Boat Anchor Transformers. With a Transformer you have Galvanic Isolation which can save your home and life. Each has pros and cons.
the only thing i don't like about the transformer inverter design is the grounding of the pv modules (+dc or -dc) to ground.
it seems that some say the grounds (a/c and d/c) can be connected (in common), but this really bothers me. it seems 'bad practice' to have a hot dc potential sitting on ground shared by a/c circuitry.
before buying a transformer inverter, i would want to make certain the AHJ will approve separate grounding (a/c and d/c separate).Comment
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Originally posted by Jest Waitn View Postit seems that some say the grounds (a/c and d/c) can be connected (in common), but this really bothers me. it seems 'bad practice' to have a hot dc potential sitting on ground shared by a/c circuitry.before buying a transformer inverter, i would want to make certain the AHJ will approve separate grounding (a/c and d/c separate).
MSEE, PEComment
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Originally posted by ButchDeal View Post
are you required to meet NEC 2014?
or rapid shutdown?
Also are you sure it has AFCI and not just GFCI?Comment
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Originally posted by ButchDeal View Post
are you required to meet NEC 2014?
or rapid shutdown?
the first pv system build uses micro-inverters. i don't want to use them again. i just found 'a deal' on these 2011 nec transformer strings & am asking for input on using them. since they support both GFCI & AFCI, it seems like 'a deal'?
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Originally posted by adoublee View PostA Renvu deal?Comment
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