Quoting Lee Hart via EV <[email protected]>:
Ron Solberg or maybe Willie via EV (I can't tell which) wrote:
Well.... back to your question. Presumed to be "Can I clean up a square
wave inverter power to something acceptable to my onboard Tesla
charger?" I'm out of my depth. Surely Lee has ideas.
In the past, I believe I've seen him recommend a motor-generator...
There are lots of solutions. Which one is "best" depends on what
you've got, what you want to spend, and how good it needs to be.
A motor-generator is perhaps the oldest way to go about it. The
motor is chosen based on what input voltage you have (AC or DC). The
generator ("alternator" if it outputs AC) is chosen for the voltage
you want. This is still a good solution for very high power, very
clean sinewaves, or 3-phase power. A motor-generator is also good at
starting heavy loads, like big motors.
I have a 32VDC/120VAC motor-generator from pre REA days I understand
was used on stage to run entertainment equipment. Also, I have seen
one run a heavy-duty grinder, off a 32VDC Edison battery, so I
understand that option.
The price isn't necessarily unreasonable if you buy surplus. I have
a Westinghouse 240vdc in, 240vac 60Hz 15/30 KW
continuous/intermittent 3-phase out unit that cost me $300. It
weighs about 250 lbs.
Next newer approach: There are filters that can "clean up" the
output of a square wave ("modified sine wave") inverter. One simple
one is called an Ott filter. Basically, it's some big inductors and
capacitors. They form resonant circuits to filter out the 3rd and
5th harmonics, and so make a square wave look a lot closer to a sine
wave. I have one that converts 120vac 600w into a reasonable
sinewave. It's about the size of a shoebox and weighs 15 lbs.
I expected this could be done and appreciate the information to
determine if it might work for my application.
Beyond this, if you really need a sinewave output, you probably have
to use a commercial sinewave inverter. Since these are expensive,
you will probably have to size it to power only the loads that are
"particular" about the power they get.
From what I know about the history/reputation of the OutBack
inverter along with their design to be serviced in the field or by
the owner, this option looks good.
If you're using PV power (DC input) to charge an EV (DC output),
then what you really want is a big DC/DC converter. A conventional
EV series motor controller can be used for this. It's basically a
step-down DC/DC converter with the output filter missing (the motor
substitutes for it). To use a motor controller as a general-purpose
battery charger, you need a big series inductor (the field of a DC
series motor, for example), and a big bank of filter capacitors (the
batteries you are charging can be most of this).
Thank you Lee ,Willie and all of the EVDL folks for the service you
provide...Ron
--
Fools ignore complexity. Pragmatists suffer it. The wise avoid it.
Geniuses remove it. -- Alan Perlis, "Epigrams on Programming"
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com[1]
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.orgPlease discuss EV drag
racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Links:
------
[1] http://www.sunrise-ev.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190401/f4db65de/attachment.html>
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
