John Lussmyer via EV wrote:
I have a 5kw on order for testing. Maximum VDC of 450 will, I think,
require some adjustment in the way I've been doing things.
Except that the 450VDC Max is only for the PV Input which has a MPPT controller.
I've read several places that a MPPT setup does not like being fed by batteries.
I think it depends on how they work. I have two MPPT trackers that still
work if they're fed with batteries; and one that doesn't.
With a battery input, the big one that works maximizes its output, as if
it's in full sun. Its input is current-limited to 8a; so that's what it
draws, regardless of the battery voltage.
The little one is the same, except its input current tracks its input
voltage. There is no input protection (except a fuse); so if the input
voltage is too high, the input current gets too high and it blows a fuse.
The one that doesn't work is in a 24v microsine inverter. With a battery
input, it ramps up to full power over a period of a few seconds; then
shuts down for a few seconds; and repeats. It doesn't appear to be
damaged; but it's also not particularly useful.
Lee Hart
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
ARCHIVE: http://www.evdl.org/archive/index.html
INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
