whezzy
Solar Newcomer
Posts: 12
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Post by whezzy on Aug 21, 2019 12:08:48 GMT
Hi all,
I have read the the percentage of the Rovers is not to be trusted. Is this still true? I have been reading my voltage and capacity first thing in the morning (still dark out) and for the past few days voltage is 12.6~12.7 but the percentage is 77%.
It has been sunny the last few days and there has been no draw on the batteries so I would have expected a full charge/reading.
Thanks,
Ryan
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Post by tattoo on Aug 21, 2019 12:21:23 GMT
Hi all, I have read the the percentage of the Rovers is not to be trusted. Is this still true? I have been reading my voltage and capacity first thing in the morning (still dark out) and for the past few days voltage is 12.6~12.7 but the percentage is 77%. It has been sunny the last few days and there has been no draw on the batteries so I would have expected a full charge/reading. Thanks, Ryan Forget about the % in your battery, It is meaning less......... But 12.7 that's what your looking for..... |
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raydas
Solar Devotee
Posts: 166
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Post by raydas on Aug 21, 2019 12:24:49 GMT
yep, it is meaningless.
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whezzy
Solar Newcomer
Posts: 12
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Post by whezzy on Aug 21, 2019 12:29:04 GMT
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Post by tattoo on Aug 21, 2019 12:29:19 GMT
Damn if you ain't just a wealth of knowledge........... |
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Post by tattoo on Aug 21, 2019 12:32:00 GMT
Thanks. I have a separate shunt monitor attached that I calibrated the 100% level to this morning when the meter was reading 12.7 You don't need a chart for that.... 12.7 is 100% Well kinda.......... It depends on many factors what kind of batteries etc........... |
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Post by bupkis on Aug 21, 2019 13:10:00 GMT
Hi ryan, the % displayed assumes the battery is in some sort of charging state.
If you were charging a battery at a decent rate and its voltage was 12.7 you would assume it is not full, but that same voltage at rest might indicate 100%. The algorithm is not smart but can be useful if you note how much charge you are getting and the battery's voltage.
Slow charge a batt to 14.5v and it might be 90+% charged when it hits 14.5v. Fast charge the same battery and it may only be 75-80% when the batt hits 14.5v. Use your grey matter to learn different voltages and charge rates!
Furthermore, your full batt with no drain should experience a charge cycle when the sun comes up, its voltage will rise to mid 14s and then float @ 13.?, all this time it is 100% SoC but the voltage will change from 12.7 t0 14.4 to 13.?, the displayed % will change but your FULL battery will stay full!!!
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raydas
Solar Devotee
Posts: 166
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Post by raydas on Aug 21, 2019 14:14:13 GMT
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whezzy
Solar Newcomer
Posts: 12
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Post by whezzy on Aug 21, 2019 14:58:10 GMT
That is some very helpful insight bupkis. Thanks for the help understanding the readings I'm getting.
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cjackg
Solar Newcomer
Posts: 17
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Post by cjackg on Sept 2, 2019 21:07:53 GMT
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