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Old 01-18-2019, 12:34 PM   #15
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Thanks Dave! Think there was just not enough sun to keep the batteries charged!
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Old 01-18-2019, 02:47 PM   #16
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Thanks Dave! Think there was just not enough sun to keep the batteries charged!
How much solar do you have. Even with no sunshine you should get something. The only way that your not is if there is something defective or your load is exceeding your solar powers output. I have yet to plug mine in this year or last year since March. It's -10C out and I'm at 100%. The panels are mostly covered in snow at the moment, but there's enough to charge it during the times it's not. I camped 3 weeks in the summer without direct sun on the panels and it was at 100% every day. What kind of equipment do you have? How much current are drawing at the moment? What is the voltage of your system? What are the settings of your charge controller?
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Old 01-18-2019, 03:24 PM   #17
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What difference a few degrees can make...

22* vs 30*🤔
Bob
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Old 01-18-2019, 05:37 PM   #18
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22* vs 30*
Bob
Still doesn't mean you have 100%. Did you measure it at the batteries? The voltage seams very low for 100%.
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Old 01-23-2019, 10:44 AM   #19
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Solar panels in the shade

Solar panels do not have to be in constant direct sunlight in order to keep batteries charged. I have two hundred watts on my roof to power my two six volt batteries. Even when parked in the shade, they recharge enough to carry me through normal use all day. This is plenty for my 16í Bambi. There must Ben something wrong with your controller. I would have the system checked out. This is not normal.
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Old 01-23-2019, 11:12 AM   #20
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Still doesn't mean you have 100%. Did you measure it at the batteries? The voltage seams very low for 100%.
What is the relationship between voltage and SOC in a Lithium battery?

"the Li-ion battery, there is a very small change for voltage between each charging and discharging cycle due to the constant voltage of Li-ion battery, it is difficult to estimate the SoC by using voltage-based method."

That is why I charge at 30%.

Bob
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Old 01-24-2019, 06:08 AM   #21
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What is the relationship between voltage and SOC in a Lithium battery?

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Measuring the SOC on a lithium is no easy task. But there are ways.....
http://liionbms.com/php/wp_soc_estimate.php

http://www.ti.com/lit/an/slyt402/slyt402.pdf

https://uwaterloo.ca/mechatronic-veh...phd-thesis.pdf
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Old 01-27-2019, 01:25 PM   #22
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if its new, please contact the manufacturer or the dealer of this brand. I hope they give a proper solution to your problem.

thanks
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Old 01-27-2019, 08:43 PM   #23
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What is the relationship between voltage and SOC in a Lithium battery?




Bob

Here you go. I got this from Battle Born.

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Old 01-27-2019, 10:05 PM   #24
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Solar system not keeping batteries charged

[QUOTE=gator.bigfoot;2202833]Measuring the SOC on a lithium is no easy task. But there are ways.....

[\QUOTE]



gator.bigfoot

It would seem to me that a battery monitor will measure the SOC of a lithium battery the same way as it does for a lead acid battery. Alternatively, using the BB voltage versus SOC table you can determine the SOC of the lithium battery using a voltmeter to measure the voltage of the lithium battery.

The photos show the voltage and the SOC of my lithium batteries using my Trimetric battery monitor.

Dan

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Old 01-27-2019, 10:48 PM   #25
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Bob

Here you go. I got this from Battle Born.

DanAttachment 332486
As demonstrated on my monitor...40% soc @ 13.03v

Bob
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