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thanar asked

V-TAC LFP batteries, trying to source information

There's a new distributor of LFP batteries in Europe for a couple of months now, under the V-TAC brand. V-TAC was founded some 20 years ago at UAE and has a very strong presence in Europe, particularly eastern Europe and the UK. They've been hard into the LED and lighting business. They've recently started offering LFP batteries for solar projects, along with other energy bundles of dubious quality. I am interested in their 10kWh model (model name: AT48-200H or VT-12040), since I can source them locally for under €250/kWh and they come with a full 5-year warranty.


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According to the local distributor, the battery is made by Vestwoods, who are a quite well-known producer of batteries, however I haven't seen any in that form factor from them.

I am trying to figure out the model of their BMS and whether there is any chance of it getting along with an ESS GX setup, either officially or through Louis' excellent serial tool. Here's a photo of the BMS they are using, in case it rings any bells (searching for "CPES-BMS16S" online wouldn't produce any results):


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They have published lots of documentation on their website for all models, and there's also a compatibility chart that displays Victron among the compatible brands; it doesn't mention to what extent, though.

I would appreciate any additional information or insights.

Here's the manual, including communication ports pinout

VT-12040 - manual.pdf

ESSLithium Batterygx devicebattery suppliers
3 comments
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Tom h avatar image Tom h commented ·

In regards to manufacturer this company: "Dongguan Antai Electronic Technology.." was listed in the test reports. Maybe its worth contacting them for more info also? screenshot-20230414-112456-drive.jpg

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miroslav avatar image miroslav commented ·

Mám tiež uvedenú batériu a s CCGX mi nekomunikovala. Potom som spravil svoj kábel a začala komunikovať. Prihlásila sa ako LG Resu. BMS to ale pri nabíjaní nepustilo na viac ako 91% SOC. Asi to bude nastavené v BMS. Nemohol som to zmeniť. Ukazovalo to tiež opačne nabíjanie a vybíjanie batérie na CCGX. Mne to fungovalo asi 3 dni. Jedného dňa mi to ale vypísalo komunikačnú chybu a odvtedy mi to zase nekomunikuje. Skúšal som všetko, ale nič nepomáhalo. Bol by som rád, keby mi niekto poradil, čo s tým.

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thanar avatar image thanar miroslav commented ·
Well, that's interesting. I still haven't got to putting together a custom cable for communication. Could you share the pinout?
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4 Answers
nickdb avatar image
nickdb answered ·
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Tom h avatar image
Tom h answered ·

I just installed 3 of these units.

Managed to come across of this piece of information. img-20230414-wa0006.jpg


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thanar avatar image thanar commented ·
Indeed, this info is attached to one of their latest online manuals. Adjusted the inverter code accordingly, but the battery doesn’t talk to the GX device using the provided cable. I will be putting together a type A GX cable and report back.
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Tom h avatar image
Tom h answered ·

I believe this is the pinout for the BMS. It was in the supplied installation documentation that came with the battery. It includes additional information then what I could find on their website.20230410-093146.jpg


20230410-093146.jpg (98.4 KiB)
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andre-godinho avatar image
andre-godinho answered ·

Hi, I am having the same problem, battery shows reversed amps from the VRM portal, SOC and Voltage works. Adding batteries in parallel also works. You just have to change the address setting in the dip switches.

Mine works on the 02 Inverter code instead of the 04 as stated in their manual.

The original cable does not work, you have to make a corrected cable.

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