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
Of course it could! A variac is unregulated; its output varies not only
as you twist the knob, but also as the AC line voltage wanders up and
down, and as the charging current changes. It would only be suitable if
you "baby-sit" it for every charge.
If the BMS is any good, it should have some way to tell the charger to
*turn off*. So you'd have to hook that up to switch off the variac charger.
Then if it were me, I'd rig up a second "backup system" to shut off the
charger in case the BMS fails to do its job.
Lee Hart
--
When something bad happens, you have three choices: You can let it
define you; let it destroy you; or you can let it strengthen you.
-- Theodor Seuss Geisel
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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