Dylan Posted November 1, 2018 Share Posted November 1, 2018 Hi, I know its been asked more or less, but not entirely clear for me at least. Can you you have two arrays one pointing east and other pointing west on the same mppt with out a complete failure of power production. Will consist of 6 panels two strings (3 series) 3 in series on west and 3 in series west, I understand the mpp will play with the voltage to get the best power and since the series strings do not go over the east west divide surely the mppt will give the best voltage to produce max power, and not be drawn too much down for array that is starting to shade. Can only fit ~3/4 panels North, the idea is to maximise solar power for longest period of the day, and doing it this way would save 1 mppt at 4k and all the switches fuses and protection that comes with two strings 2k. Looking at an overall installed cost of 100k excl certification and an extra 10 isn't nothing. Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted November 1, 2018 Share Posted November 1, 2018 East West arrays is an idea from Germany where low monetary returns on exported power increase the need for self-consumption. If you want to do it on the same MPPT there are some provisos. Each array must be made up of the same number of identical (make and model) panels. The panels should be inclined 15° and the panels should face East - West. Under these circumstances you can get away with a single MPPT. ___ 1 Quote Link to comment Share on other sites More sharing options...
Dylan Posted November 1, 2018 Author Share Posted November 1, 2018 25 minutes ago, Chris Hobson said: East West arrays is an idea from Germany where low monetary returns on exported power increase the need for self-consumption. If you want to do it on the same MPPT there are some provisos. Each array must be made up of the same number of identical (make and model) panels. The panels should be inclined 15° and the panels should face East - West. Under these circumstances you can get away with a single MPPT. Thanks Chis, Whats the reason for 15deg limitation? Quote Link to comment Share on other sites More sharing options...
Garthvs Posted November 1, 2018 Share Posted November 1, 2018 I'll be testing the East West split on a single MPPT in the next week or so and will give feedback. I won't be using the 15° idea though as it doesn't really make sense to me other than from an optimisation perspective and I can't actually use 15° on the test roof. Quote Link to comment Share on other sites More sharing options...
DeepBass9 Posted November 1, 2018 Share Posted November 1, 2018 (edited) Just get another MPPT, they are cheap enough and you have some redundancy. I had a single MPPT which was damaged by lightning. I ran on a generator for a week while it was repaired. I since added another array with its own MPPT, so if I lose one MPPT or solar array, at least I will have one array up and working power. Edited November 1, 2018 by DeepBass9 ___ and Chris Hobson 2 Quote Link to comment Share on other sites More sharing options...
phil.g00 Posted November 1, 2018 Share Posted November 1, 2018 Some light reading on the topic: https://www.energymatters.com.au/images/news/2013/east-west-solar-paper.pdf Quote Link to comment Share on other sites More sharing options...
Dylan Posted November 1, 2018 Author Share Posted November 1, 2018 3 hours ago, phil.g00 said: Some light reading on the topic: https://www.energymatters.com.au/images/news/2013/east-west-solar-paper.pdf Thanks Phil, that paints a pretty clear picture that at the very least it's possible and can be the optimum solution if done right. Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted November 1, 2018 Share Posted November 1, 2018 7 hours ago, Dylan said: Thanks Chis, Whats the reason for 15deg limitation? If you go to a greater inclination then in winter the sun is at a very oblique angle and production suffers. Quote Link to comment Share on other sites More sharing options...
seant Posted November 2, 2018 Share Posted November 2, 2018 The install of the pannels on the east and west side can be raised off the roof in the north/south inclination , it seems to work quite well Quote Link to comment Share on other sites More sharing options...
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