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How to calculate the right value for MCB or MMCB
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You are talking several magnitudes of scale beyond what you can get for free on a internet message board. A real answer has to come from a certified engineer in the energy field.
I can give you an answer, but if it's wrong by a factor of 20x, how would you know ?Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister -
Originally posted by Bendesa1962
Well at least that's an answer. And what makes you think that I will take every answer here for granted? Or is it just a way of saying I don't know (-: Off course not but if people don't want to react thats fine off course. Enjoy your day.
Please show me the calculation ( from your orig 8/3 post )
if you are doing a +20kw install, YOU need to know what the heck you are doing, and I cannot give you an answer, because if you withheld any info needed for a good answer and you say "Oh mike in the internet said xyz would be fine, so he's the one responsible for frying your 9 ton 3 phase transformer" well, that leaves me hanging for your job. So I CAN'T give you answer. There are many more variables you have not given us.
Sorry I'm in a snarly mood. 2 weeks of heavy smoke, intermittent power cuts in town, worst wildfires ever in California, about 40 miles from me.
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Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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Before anyone will give you a value for an MCB they will need to know the voltage and the short circuit interrupting rating at the connection point.
Or we can just assume a voltage and provide you with a grossly inadequate breaker rating.Comment
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Originally posted by Bendesa1962Who said I'm going to install a 20 KW Pv System?Last edited by sdold; 08-10-2018, 12:40 PM.Comment
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Originally posted by Bendesa1962Well at least that's an answer. And what makes you think that I will take every answer here for granted? Or is it just a way of saying I don't know (-: Off course not but if people don't want to react thats fine off course. Enjoy your day.Comment
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I don't even believe the system is in the USA. No one gives a wire size by saying 4 x 35mm2. So who knows what the 3 phase voltage is for the grid.Comment
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I agree with your surmise, but IMO, that doesn't excuse the entitled attitude. If the OP claims expertise (?) in the engineering necessary for facilities engineering, her/his employer might like to know their hireling is asking for technical help from a chat room.Comment
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Originally posted by Bendesa1962Well guys thank you all very much for your kind help. I do appreciate it. Thanks a lot! OMG it looks like you all are infected by your greatest president of all time Mister TrumpPowerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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Last edited by Sunking; 08-10-2018, 09:08 PM.MSEE, PEComment
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Originally posted by Bendesa1962Well guys thank you all very much for your kind help. I do appreciate it. Thanks a lot! OMG it looks like you all are infected by your greatest president of all time Mister TrumpComment
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