Quick question about lead acid to lithium golf cart

[Tombola]

We have an old golf cart we used to use for nipping round our works from unit to unit, it has 4 old trojan Lead batteries .
Is it no problem if i change these for 1 large lithium?

Screenshot

Captured with Lightshot

prnt.sc

 

[Guigsy]

Looks like they're being run in series, so will be outputting 48v?

 

[Tombola]

Looks like they're being run in series, so will be outputting 48v?

good point yes, they need a 48v charger if charged all together

 

[Gromett]

£60 each. 16 needed.

EVE LiFePO4 105Ah Prismatic Cell (Grade A)

Eve LiFePO4 105Ah Prismatic Cells are ideal for off-grid solar batteries, campervan batteries, and leisure batteries. Grade A cells, full certification, supporting documents are available upon request (UN38.3, Specification Reports & MSDS).

www.fogstar.co.uk

Probably want a BMS as well. Not sure what the current draw is but if it is 100A or less then another £60.

Just a suggestion for a starting point to do it cheap. No idea of how it would work or integrate as not enough info.

 

[RogerIvy]

It would be relatively easy to build a 16-cell (48v) LiFePO4 battery. You could use 100AH, 200AH (or 230AH) or 300AH cells depending on budget and power requirements. I’d go for a JK or JBD BMS.

^{_{Subscribers  do not see these advertisements}}

 

[autorouter]

it has 4 old trojan Lead batteries .

I'd double check that voltage. Many Trojan batteries are 6V not 12V.
Edit: Looking at the screenshot, the batteries have 6 screw caps, so they are 6-cell batteries, ie standard 12V.

 

[Gromett]

I'd double check that voltage. Many Trojan batteries are 6V not 12V.

If it is 6V then you would only need 8 cells obviously big saving

 

[autorouter]

It would be relatively easy to build a 16-cell (48v) LiFePO4 battery. You could use 100AH, 200AH (or 230AH) or 300AH cells depending on budget and power requirements. I’d go for a JK or JBD BMS.

The reason 16 cells are used is that four 4-cell '12V' can be connected in series to give '48V'. However if you do the calculations, and are adding one cell at a time, then only 15 cells are required to give the equivalent of four 12V lead-acid batteries. Many 48V battery packs such as the Pylontech ones have 15 cells, not 16. Obviously the charging voltage needs to be adjusted a bit.

 

[Guigsy]

The reason 16 cells are used is that four 4-cell '12V' can be connected in series to give '48V'. However if you do the calculations, and are adding one cell at a time, then only 15 cells are required to give the equivalent of four 12V lead-acid batteries. Many 48V battery packs such as the Pylontech ones have 15 cells, not 16. Obviously the charging voltage needs to be adjusted a bit.

Although 16 cells will probably give the cart a bit more pep.

 

[L' Hobo]

Would not the modern golf buggies have lithium batteries and have a tried and tested set up worth following?
Or is that too easy?

^{_{Subscribers  do not see these advertisements}}

 

[Raul]

The reason 16 cells are used is that four 4-cell '12V' can be connected in series to give '48V'. However if you do the calculations, and are adding one cell at a time, then only 15 cells are required to give the equivalent of four 12V lead-acid batteries. Many 48V battery packs such as the Pylontech ones have 15 cells, not 16. Obviously the charging voltage needs to be adjusted a bit.

Not quite, pylontech switched to 16S as the 15S was constantly abused and singled out.
The 16S it has a absorb lower or close to Pb and lower float to. Inverter turn off it’s way to high on a 15S. Some inverters are preset without being able to change that.
The victron gear is good for 66v so you want to keep the voltage as high as possible for good efficiency, the 16S it’s the Goldilocks on lfp. I know a guy running 8S Nissan Leaf modules, 60v on a Studder.

 

[Tombola]

whats to stop me chucking in a 200ah 12v Lithium that I have lying around ? with built in bms

does it have to be 48v or maybe 24v? I have 2 x 100ah too


I was looking here and notice they have 24v cart batteries ?

Lithium Batteries For Golf Trolleys and Golf Buggies

Lithium batteries For Golf Trolleys and Golf Buggies have been around now for 12 years or more

www.topcaddy.co.uk

 

[RogerIvy]

The vast majority of lithium batteries cannot be placed in series with each other, so your current batteries may not work.

 

[Guigsy]

If your lithiums are many cylindrical cells, you could potentially reconfigure for 48v. Probably need a new BMS though.