Advice needed - Solar System

rh1 said:
Not sure, thought it was winter. Only running 9 panels at the moment.
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No - winter should still allow 100% as long as there is PV - there must be a setting somewhere coz on both days it tapers between 85 and 90%
 
Mzezman said:
No - winter should still allow 100% as long as there is PV - there must be a setting somewhere coz on both days it tapers between 85 and 90%
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After you pointed it out, I went to look at the settings but I am not sure as I could not identify anything that would prevent it from fully charging.
 
rh1 said:
After you pointed it out, I went to look at the settings but I am not sure as I could not identify anything that would prevent it from fully charging.
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What is the battery voltage at 88%?
 
rh1 said:
Very weird, maybe some of you can assist:

Yesterday, Cape Town was beautiful sunny day, even the day before was a sunny day, when the sun is directly above my house, I was generating under 500w of electricity. Today same time, but a bit overcast, I was generating almost 2kw of electricity. Why do I generate more power on overcast days than on sunny cloudless days
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You only generate what you use. If there is no load, it will generate 0W.
 
Mzezman said:
Any reason your batteries are not going to 100%? Esp on the clear sunny day? The seem to taper out just under 90%
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Most Li batteries "taper out" or slack off charging rate at 88-90%. It depends on what the BMS dictates to the inverter via CAN comms.
 
RonSwanson said:
Most Li batteries "taper out" or slack off charging rate at 88-90%. It depends on what the BMS dictates to the inverter via CAN comms.
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Taper was the incorrect term to use.. mine also tapers after 90% but still charges to 100

His seems to be actually stopping the charge cycle
 
Managed to sort it out over the phone with installer. Installer requested I discharge the battery to 30% which I never did previously. Thereafter charge via the grid to 100% using the settings (so all time slots were temporarily set to 100% SOC). He did notice that whilst the % said 87%, the actual battery voltage indicated 53.4v compared to the battery charge voltage 53.6v. Which basically meant the battery was nearly 100%. Once the battery voltage got to 53.6v the battery SOC change to 100%.

So I think it was a calibration issue, maybe because I never discharge the battery below 40%.
 
So my brother helped me install the additional panel yesterday, been in my garage now for a while now. Today, I can already see the difference.

Previously, due to my crappy roof orientation, in the morning, only 4 panels got the sun, lunch time all 9 got the sun, by then the batteries are normally charged on a sunny day. If it is an overcast day, then, I would only get to 95%+ just before sunset.

So I will definitely, get more panels in future.
 
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