After recently finishing my new board with 12s4p 30Q pack (12Ah). I plugged in my old 1.5A charger, only to find that it takes around 8 hours to charge my board This is simply not be acceptable during group rides. My goal is to be able to charge at the same mins per mile rate as my boosted friends.
I started looking for a 50.4V charger that would give me >4A and will ship to the UK before a group ride this weekend but im not having much luck finding anything more than about 2A (still 6 hour charge)
HOW MANY AMPS?
According to the 30q data sheet (https://eu.nkon.nl/sk/k/30q-specs.pdf) each cell’s standard charge is 1.5A or fast charge is up to 4A. In a 4p configuration this means i could happily charge at 6A or fast charge at up to 16A
4A charger would still take just over 3 hours to get a full charge in and 6A would be ~2 hours.
POSSIBLE SOLOUTION - 48V LED DRIVER
After discussing the problem with a guy from work he suggested i buy a 48V led driver.
These drivers are a CCCV power supply usually used for led lighting but might be perfect for esk8 charging.
- They are available in a range of voltages to suit any number of series cells.
- The output voltage is adjustable (with a screw driver). The data sheet says that the “48V” models can actually have an output Voltage between 44.8V and 51.2V (perfect for the 50.4V needed for a 12s pack).
- They are available in many different output currents up to 12.5A.
Output current is also adjustable (with a screw driver). This means that you could crank it up for fast charge at events and group ride but then dial it back for overnight charging when you not concerned about your charge time. Im thinking this could easily be wired to a few position switch for easy current switching.
you could also mod output voltage to be set with a switch if you wanted a “only charge to 80%” type mode which puts less wear on your batteries if your doing charge cycles every day commuting or plan on not using your board for while and not want to store it at 100%.
BUT WHATS THE COST?
48V - 150W - 3.2A costs £39.
48V - 185W - 3.9A costs £43.
48V - 240W - 5A costs £52.
48V - 320W - 6.7A costs £69.
48V - 480W - 10A costs £104.
48V - 600W - 12.5A costs £151.
All are available with free next day delivery from Farnell.
Im considering ordering either the 240W or 320W version.
The 240W version would give me just over 2 hour fast charge or 5 hour slow charge.
£70 is not cheep for a charger but 320W version would give me just over 1.5 hour fast charge (faster than a boosted extended range pack) or 3.5 hour slow charge. This would still be less than half the “fast charge” current given in the 30q data sheet.
WHAT DO YOU GUYS THINK?
Has anyone ever used one of these before?
Do you think it could work?
Is there a better option that i have missed?
So it seems like, as with most things, im not the first to think of this idea.
On .builders there are quite a few posts about using MeanWell LED drivers as chargers so i have committed and ordered the 48V 320W charger. found them on amazon so it should be here tomorrow