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Old 02-02-2019, 13:22   #1
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State of Charge

I am recovering from a self inflicted crash of my firefly battery bank and have a question. I know it is not the preferred method but what would be considered the soc of a battery at 12 volts . My link ten says one thing and I am trying to figure out whats what while out crusing . We have not been able to do the recovery charge yet
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Old 02-02-2019, 18:21   #2
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Re: Soc

SoC cannot be accurately determined via voltage while in use.

12V at rest means "not fully charged, nor harmfully dead".

Maybe Bruce @ Ocean Planet could give you a ballpark, but they would need to be at rest.

Or get a better SoC gauge like SmartGauge or Victron BMV, or maybe the new Balmar SG200, and that will give you a decent reference to see how far off the Link 10 is.
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Old 03-02-2019, 01:43   #3
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Re: Soc

These are under load. Nit under load probably around 50%


Get To a dock. Fully recharge. Reset meter. They need to be reset often.
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Old 03-02-2019, 04:05   #4
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Re: Soc

Smac999 , where did you get that graph . I willtry to find it as the one you sent was to blurry to read . This morning the meter reads about 11.8-11.9 with a bout a 7 amphere load and the sun just kissing the pannels . I know this is not the best way to figure stuff out but I wont be able to get to a dick for another week .
Interesting to me was the monitor indicated full charge a couple of times in thelast few days so I thought about the reset . When I lookedat the negative amp hours build up it was only 6.5 on a525 amp bank
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Old 03-02-2019, 04:55   #5
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Re: Soc

According to the Firefly chart, a battery voltage of 12.1/12.2V represents a SOC of about 40%.
11.80/11.84V = 30% SOC.
Click on the chart, and hit “+” to expand it.
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Old 03-02-2019, 05:25   #6
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Re: Soc

Here are the results of running the PNG file through 10-year old text recognition software and adding dots to straighten out the table.

firefly Page 2 of 2
..... ..... ..... ........Battery
........... ..... C3 .......... C10
...Soc... ..... Voltage ... Voltage
100.0% ..... 13.35 ..... 13.35
90.00% ..... 12.58 ..... 12.78
80.00% ..... 12.49 ..... 12.64
70.00% ..... 12.38 ..... 12.50
60.00% ..... 12.25 ..... 12.34
50.00% ..... 12.13 ..... 12.19
40.00% ..... 12.01 ..... 12.02
30.00% ..... 11.80 ..... 11.84
20.00% ..... 11.58 ..... 11.63
15.00% ..... 11.47 ..... 11.49
10.00% ..... 11.30 ..... 11.33
05.00% ..... 11.05 ..... 11.10
00.00% ..... 10.50 ..... 10.50
Tested By Vishal Tholiya EL Technician
Verified By Rakesh Prajapathi(Head-QC)
Balaji Balasundaram (Head-Design)
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Old 03-02-2019, 05:29   #7
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Re: Soc

Like that table shows, you can determine SOC within 10% or so from voltage alone. Just be sure there isn't a crazy load at the time, as that will skew things.


You are at about 50% SOC
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Old 03-02-2019, 09:46   #8
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Re: Soc

Yea I agree , I need to do the restoration charge as the link10 says I am at about 80% based on bank size and usage overnight
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Old 03-02-2019, 11:28   #9
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Re: Soc

Solar really messes with amp meters. Bacuse they reset themSelfs with low current. (Which normally means a battery is full). But with solar. Just means you have a little sun.

Sounds like yours is resetting itself back to 100% to early?

You need to play with voltage and current reset. Settings.

If you click on the photo it shows fine. I don't have link to full PDF. I saved it a while ago. And just took screenshot of that page to post. Probably from this site.
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Old 03-02-2019, 12:45   #10
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Re: Soc

100% resets should be manual.
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Old 03-02-2019, 12:57   #11
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Re: Soc

Quote:
Originally Posted by john61ct View Post
100% resets should be manual.


All battery monitors do it automatically based on voltage, current, and time.

Ie over 13.5v + Under 2a for more then 5 mins.

Which under battery charger or engine mean's battery is full. But with solar. Could just mean little sun.
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Old 04-02-2019, 03:46   #12
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Re: Soc

My point is that doing it right usually means disabling that automatic feature, and only resetting the 100% point manually when you know you are actually at your 100% point via measuring endAmps at the bank.

It is conceivable that some units do not need these resets - the new SG200 may not according to Maine Sail, and the Merlin SmartGauge may not depending on how well the bank behaviour matches up with its algorithms and internal database.

But they are exceptions that prove the rule.

CTRL-F look for gotcha

here https://marinehowto.com/programming-a-battery-monitor/

also the "installing" post.
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Old 04-02-2019, 04:21   #13
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Re: Soc

I will look at doing the reset after i have done the restoration charge . FF seams to suggest that faster is better. I have a 60 amp charger and 900 or so watts of solar and 2 stock alternators . I hope that I can use all three to get everything rocking . But I am concerned that one of the three will cause the other sources to kick out . Btw 525 amphour bank
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Old 04-02-2019, 05:32   #14
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Re: Soc

Yes pretty sure you should get another shore charger to get best longevity, ask Bruce.

But then doing your recovery cycles a bit more frequently would probably be a higher priority goal, if possible.

The key is controlling that Discharge phase so you do hit (but do **not** go below) 10.5V and then start the recharge immediately.

I don't know if that protocol benefits from high current rates or not, again, Bruce or Maine Sail are the ones to ask IMO.

I suspect not, getting higher amps in your normal usage cycling would likely be more important.

Quote:
Originally Posted by admiralslater View Post
I am concerned that one of the three will cause the other sources to kick out
Don't be, just do what you can within reason to keep everything going up to 80-85-90%, if any drop to Float just restart.

Once SoC is high, they won't be accepting all that much anyway.

Just let the most adjustable & accurate charge source do the Finishing stage, and make sure to verify the top 100% by keeping Absorb V going while measuring current until endAmps is reached.
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Old 05-02-2019, 06:51   #15
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Re: Soc

The SG200 does indeed do a synchronization, but in reality it is not used the same way as traditional shunt-based systems. The displayed SoC will go to 100% at that point, and stay there while charging completes, if the synchronization happened before actual charge termination. Once charging stops, and some discharge occurs, the SoC will adjust downward if needed to show the actual state of charge. This would occur only if synchronization happened before actual charge termination, AND charge termination occurred before the battery was actually full.

while we allow the user to chance the Charge (termination) voltage and taper current, chaning these values has a risk. If they are set so the software does not ever recognize charge termination, it will effect the SG200's ability to calculate SoH. This is outlined in a recent update to the SG200 manual, found on our website.

We are still gathering data from users, but the only time a change to those values may be needed is with large battery banks, like 700AH+.

Chris

Quote:
Originally Posted by john61ct View Post
My point is that doing it right usually means disabling that automatic feature, and only resetting the 100% point manually when you know you are actually at your 100% point via measuring endAmps at the bank.

It is conceivable that some units do not need these resets - the new SG200 may not according to Maine Sail, and the Merlin SmartGauge may not depending on how well the bank behaviour matches up with its algorithms and internal database.

But they are exceptions that prove the rule.

CTRL-F look for gotcha

here https://marinehowto.com/programming-a-battery-monitor/

also the "installing" post.
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