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Old 06-18-2020, 12:22 PM   #31
Sergio
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Default Re: Few lithium swap questions

Never did since I did not think the cost of the two relays was a good trade-off for not been able to isolate the charger from the cart or having to make sure the BMS enclosure is adequate to dissipate the heat created by the charging current.

I will try to sketch something quickly and post in a while so You can see what it would look like.
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Old 06-18-2020, 01:03 PM   #32
Sergio
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Default Re: Few lithium swap questions

When using a single relay the BMS itself will stop the charger in case of a HV condition.

Make sure the BMS has at least twice the current capacity as the charger output and allow for heat dissipation in the enclosure around the BMS board.





K1 - 48vDC SPST Relay:
https://www.mouser.com/ProductDetail...QaAg4pEALw_wcB

D1 - 1N4007 flyback diode:
https://www.mouser.com/ProductDetail...xY3rLmCS1i8%3D

P1 - 620 ohm resistor (if a 12v panel mount LED is not used):
https://www.mouser.com/ProductDetail...Q4V%2FdWXPM%3D



This is the setup I use with the three relays, it allows You to use a BMS as small as 20 amps, isolates the charger from cart when not in use and disables the cart when the AC extension is plugged to the cart.
https://www.buggiesgonewild.com/showthread.php?t=160302
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