Hi Everyone.

I was asked by one of my customers to install (he has them already) two Harbin Coslight 48v 100ah lithium batteries for him. I cannot get any info online except that they are 15s 3.3v cells. The Coslight company in India, seems reluctant to help because they cannot verify which supplier in S.A. sold him these batteries. Does anyone out there have the charge parameters for these batteries, please?

If no-one else comes forward with information, you could do worse than using the settings for Pylontechs, which are also 15S, but with a maximum charge current of 50 A (C/2) per module.

Hi Coulomb

Thank you for your advice. From what I can find so far they have a 0.5c rating and operate between 42v and 54v. He will be charging each battery at around 40A.e

I was thinking of setting the bulk charge to 54.2v, float to 53.8v absorption to 30 minutes or less and disabling the equalize charge. Then, leaving the rest up to the internal BMS. It will not give a full charge, but the batteries will certainly last longer. 

Do these settings sound feasible?

2 hours ago, Solaris said:

operate between 42v and 54v.

That has to be a 15S battery then. [ Edit: as you posted earlier. ]

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He will be charging each battery at around 40A.

Ok.

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I was thinking of setting the bulk charge to 54.2v, float to 53.8v absorption to 30 minutes or less and disabling the equalize charge.

Err, 54.2 is over 3.6 VPC. That's too high. I would use 53.2 V and 53.0 as per Pylontechs, or even 52.2 V and 52.0 V to get them balanced initially.

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Then, leaving the rest up to the internal BMS. It will not give a full charge,

The BMS can't cut back the charge current much, by one amp or less. I assume by "will not give a full charge", you mean because of the premature float bugs. 

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but the batteries will certainly last longer. 

Actually, keeping a lithium battery closer to 100% SOC won't make them last longer, it just allows you to get more useful energy from them. If they were lead acid, then yes, they would last longer.

Edited May 23, 20197 yr by Coulomb

1 hour ago, Coulomb said:

Err, 54.2 is over 3.6 VPC. That's too high. I would use 53.2 V and 53.0 as per Pylontechs, or even 52.2 V and 52.0 V to get them balanced initially.

Good advice, I will use those settings instead.

 

1 hour ago, Coulomb said:

Actually, keeping a lithium battery closer to 100% SOC won't make them last longer, it just allows you to get more useful energy from them. If they were lead acid, then yes, they would last longer.

This is quite different from what I have read on many websites. “They say” that cycling a LFP battery between 10% and 90% will give a further 1500 cycles to the life span.... 

Well thank you for clearing that up. As you can see us nubies to LFP batteries need a lot of educating... 🤦🏻‍♂️

4 minutes ago, Solaris said:

"They say” that cycling a LFP battery between 10% and 90% will give a further 1500 cycles to the life span.... 

Well, compared to cycling 0% to 100%, that's probably true.

I run 3 X  Coslight batteries with a Phocos AnyGrid 5Va/5Kva Inverter and have set them at Bulk charge 53.5V and Float at 53.0 Volts. Equalisation is disabled, BMS cable to inverter disconnected; Communication between batteries is there (connected). All dip switches set at 0000 and then restarted them starting with the "assumed" master battery (the one directly connected to the inverter) . They work like charm and have very good synchronised charging and discharging. At first the supplier had advised setting float charge as per the Coslight sticker (54V) which cause one of the batteries to display a red fault light. 

Note that the Coslight battery specs sheet shows that they have to be charged at -54V Float 

Do you have the passwords on this bms

Does anyone know where one can get more of these Coslight batteries. I would like 2 more. Can any other batteries pair with them to increase my battery bank. 4.8kw 100ah