We have a huge variac with a bridge diode we call "Mongo charge" that we
use if we let the magic smoke out of all our on-track chargers.
We _never_ leave it unattended. Ever.
If you (or we) decided to leave such a primitive charger
unattended, we would probably use a ~25 Amp, optically isolated, Solid
State relay on the AC side of it. We would run the SS relay from a TTL
line on the BMS. (The SS relays typically have a 3 to 30 VDC optically
isolated control input that will operate nicely from a logic level
output on the BMS.)
Bill D.
On 6/8/2020 2:46 PM, Lawrence Rhodes via EV wrote:
I think I found an inexpensive 20s 60amp BMS. I am still not sure what charger
to use. Is it possible to experiment with different voltages starting with
71.4 and going to 73vdc using my old standby variac with a diode bridge. Could
this be dangerous if set and left unattended? Lawrence Rhodes
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