Charge settings for 48v of Lithium.

nwillitts said:

charge @56.5v @40 amps should be ok.54.4v will be a full charge.
jasonhc73 may know more.
i have the same mpp.

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Supervstech said:

The annoying thing about this chart is it is in Ah... and 3.6 shows same info as 3.7, 3.8, and 4.2v...

but the Wh would be higher as the battery voltage increased...

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• Maximum charging, I have mine set to 20 amps, but you can easily do 100 amps with new Battleborns (the built in BMS cuttoff is 100 amps +/- 5% for 30 seconds).
  • Program 02 on the panel
• Battery type: User
  • Program 05
• Maximum Utility Charging @ 10 Amps - 60 amps, This means if there is no solar, just grid power to the batteries. New can easily handle 60
  • Program 11
• Back to discharge (49-58) Set it to Ful or 58,
  • Program 13
• Are you tired of that panel beeping yet?
  • Program 18 (bOF)
• Bulk charging voltage (C.V. voltage) - 58.4V (I would do 57.6Vif I bought them, the BMS builtin to the BattleBorn will cut-off at 58.8)
  • Program 26
• Float charging voltage - 53.6V - (The self-dischargerate is so low that you really don't even need to float them)
  • Program 27
• Equalization setting - Disable
  • Program 33 - (EdS)

nwillitts said:

jason,what do you have your BYD batteries set at?

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smoothJoey said:

Further down in the manual

"Series Up to four BB10012 batteries may be connected in series to increase the voltage of the system up to a 48V system. When batteries are mounted in series, current capacities remain the same, but the system voltage is additive. Two BB10012 batteries mounted in series to form a nominally 24V system should be charged using a bulk and absorption voltage of 28.8V, and a float voltage of 27.2V. Four BB10012 batteries mounted in series to form a nominally 48V system should be charged using a bulk and absorption voltage of 57.6V, and a float voltage below 54.4V."

14.4 x 4 = 57.6
14.4 / 4 = 3.6

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emt27 said:

Contact BB directly, provide them with the charge controller you are using and they will give you the information. They have answered all my questions within a day, sometimes the same day. Great company.

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Daley said:

Thank you so much for all your replies!

Where did you get your version of software used in the screenshot? I downloaded the software but it won’t let me have user defined battery as an option. I suspect I have an older version?

Also does anyone know why I cannot get the utility/shore power to charge?
It shows up as an icon and 124v and 60hz but I cannot get it to charge the battery bank, even when using the setting for utility charging only.

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Daley said:

That’s the one I downloaded but it seems to lack the custom battery option for me.
[/QUOTE

did you create new password for the software?

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Daley said:

I tried administrator password but didn’t help. I’ll try setting a new password.
Front of panel doesn’t have all the same features as far as I can tell, like data logging.

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Solarfun4jim said:

I had thought that the first charge cycle was different from subsequent ongoing charging. Should you perhaps use 3.65v per cell on first charge and top balance the pack at that, then thereafter, charge up to anywhere between 3.4-3.6v per cell depending on the capacity & longevity preferences you are aiming for, from the pack. ie, if you want to cycle the pack from 90% down to 20% soc, you might aim for. 3.4v/cell.

"Charge Voltage Needed
So what Voltage is enough to get those ions moving? A little experimenting shows that 13.6 Volt (3.4V per cell) is the cut-off point; below that very little happens, while above that the battery will get at least 95% full given enough time. At 14.0 Volt (3.5V per cell) the battery easily charges up to 95+ percent with a few hours absorb time and for all intents and purposes there is little difference in charging between 14.0 or higher Voltages, things just happen a little faster at 14.2 Volt and above."

If charging by solar alone, for say 5 hours /day, then i might suggest the 3.5v/cell would give the best compromise between capacity and minimising stress/heat on the cells.

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PfloydBham said:

"Charge Voltage Needed
That is something of a mystery to me since I am fairly new "anything that does not originate from the power company"
So what Voltage is enough to get those ions moving?"
Your comments were very helpful to me! Thanks. I have a question about Tesla set ups. I have a small rig set up in a travlle trailer using an "S" 5.2 Kw module. Right now I am storing it inside so No solar exposure. I have a small hobby charger that puts out 25 volts at about 4 amps. the "s" pack is 6s with 3.7v to 4.2v range. (cobalt)
I don't know enough about batteries to know if I can just connect it to the battery and let it charge for a couple of hours to increase the SOC? If I leave it connected will it continue to push power into it or will it equalize at 25.0v which is supposed to be the output of the charger.
I hope this enough information to make sense. Any thoughts are appreciated, thanks.
Pink

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jasonhc73 said:

Your small hobby charger will put e- into the pack. It will not seem like it is doing anything, however. Anytime any battery faces a V that is higher than what it is at, it will absorb that V and very slowly try to equalize to that V. It doesn't matter if it's a giant 125 kWh supercharger, an 11 kWh destination charger, a 3 kWh home charger, or a 500-watt hobby charger. You can even plug it into another Tesla battery in parallel, and the two will average each other out, and eventually have the same voltage.

It will be like filling a pool one spoon at a time, but it is not impossible.

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