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Solar pv batteries distance to CU
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<blockquote data-quote="revor" data-source="post: 519119" data-attributes="member: 23254"><p>Yes I think you are right system is limiting what goes to the grid I wonder if it is to doing it by meeting resistance from the grid to take it. The normal background grid volt here is about 245 V but at peak production it goes up to 255/256V soon as load on or producing less solar drops to about 250V .There is a function that stops export all together have not tried that recently but that controls by throttling back the solar output don't know how it does it.</p><p></p><p>I too have been concerned about the battery "collapsing" to a low percentage but I do not know what that means in terms of acceptable volts and do not know the relationship between SOC and volts. Been taking a lot of readings to see if I can find the correlation between the two best at moment I think that it exhibits a hysteresis it is different on way up (charging) to when it is discharging. All summer we have never really used all the battery as I was told that the BMS has not "learned", the analogy I was told was "how do you know how much a bucket holds unless you empty it and fill it". My understanding is as yours it should not go below a set minimum charge mine is without looking up 20%. during the recent period I have recorded the highest and lowest voltages since commissioning 61V and 51.9 but do not know the expected range for a 54 v battery. What have been led to understand is 60 V is considered 100%. When it was low it was taking charge from the grid until a certain point then solar took over. </p></blockquote><p></p>
[QUOTE="revor, post: 519119, member: 23254"] Yes I think you are right system is limiting what goes to the grid I wonder if it is to doing it by meeting resistance from the grid to take it. The normal background grid volt here is about 245 V but at peak production it goes up to 255/256V soon as load on or producing less solar drops to about 250V .There is a function that stops export all together have not tried that recently but that controls by throttling back the solar output don't know how it does it. I too have been concerned about the battery "collapsing" to a low percentage but I do not know what that means in terms of acceptable volts and do not know the relationship between SOC and volts. Been taking a lot of readings to see if I can find the correlation between the two best at moment I think that it exhibits a hysteresis it is different on way up (charging) to when it is discharging. All summer we have never really used all the battery as I was told that the BMS has not "learned", the analogy I was told was "how do you know how much a bucket holds unless you empty it and fill it". My understanding is as yours it should not go below a set minimum charge mine is without looking up 20%. during the recent period I have recorded the highest and lowest voltages since commissioning 61V and 51.9 but do not know the expected range for a 54 v battery. What have been led to understand is 60 V is considered 100%. When it was low it was taking charge from the grid until a certain point then solar took over. [/QUOTE]
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