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14s to get 48v?
#11
(10-30-2019, 08:08 PM)daromer Wrote: 14s is equal to 48vdc la in powerwall and most places
Also in bms works. We dont take nominal but the rated voltage swing.

Ebike works is not the same as powerwall works Wink

Same as 16s life is the standard for 48vdc

That's my point.  A 48v BMS will not work for 14s.  It doesn't have the connections.
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#12
Depends. 48v bms can be found as 14s to.

Google 48v bms and you find all from 13-16s bms.
As Said ebikes bms are not for a powerwall.

Sidenote. I have done some work for battery and powerwall companies and they where all 14-16s when it came to powerwall. They did not run 13.
DiggsUt likes this post
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#13
This sounds more like a nomenclature battle than a technical one…

Around here 48v system means 14s, but its really to denote voltage compatibility with legacy lead acid equipment.

I built a “48v” setup using 15s lithium ion because all my Victron 48v chargers and inverters can support that input voltage. I bought one of those Bluetooth BMS units which I understand was very much an eBike accessory. I just refer to it as a 15s BMS because that is what it is.

As long as all the components are setup to work correctly with each other and support the voltage range we are good to go. It’s probably best we all include series cell counts, mix/max voltages when trying to have a discussion as things tend to vary based on forum and application.

Most all my background is from solar and battery storage perspective, along with RC. Everyone generally navigates around the nominal voltage which started to create confusion for myself when moving to a different board.
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#14
Yeah its better to say 14s or xxs. Because the voltage on inverters and chargers is based on the old 12v... S
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#15
(10-30-2019, 08:03 PM)DiggsUt Wrote: I see everyone here keeps referring to 14s as 48v.  That's going to mislead more than a few.  In the ebike world and with BMSs, 13s is 48 volts and 14s is 52 volts.  It makes a big difference when buying a BMS.

14s can be considered 50.4 V, as the reference value for high power cells is 3.6V / cell.

If you build something, you should take the min and max into consideration too.
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#16
Whats worth mentioning is that 48V aka from 12V comes from the empty voltage level of LA and not nominal Smile
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