Go Back   EcoRenovator > Improvements > Solar Power
Advanced Search

Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read

Thread Tools Display Modes
Old 12-12-18, 08:54 PM   #51
Lex Parsimoniae
Xringer's Avatar
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,821
Thanks: 104
Thanked 238 Times in 220 Posts

Wow! I can't believe people still read these old threads..
A long time ago, I gave up on trying to control the DC power from the PV arrays.
I just keep an eye on the water temperature, tell my wife to turn on the dishwasher,
or I just enjoy a nice extra long hot shower to regulate the water tank temp..

To sum up the test results of using RF Coax to deliver DC power from solar arrays, it works.
(Has been working for almost six years).

I'm not sure what the max current limitations are, but in series configuration,
8 Amp panels put out a max current of 8 amps. (Into my 13 ohm heater loads IIRC).

Because they are buried cables (not in conduit), I regularly measure for leakage to ground and for normal power conduction.
So far, the cables have performed like new. I'm guessing their life span is in the 20+ year range.

My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
Xringer is offline   Reply With Quote
Old 12-12-18, 11:03 PM   #52
Supreme EcoRenovator
NiHaoMike's Avatar
Join Date: Oct 2008
Location: San Diego, CA
Posts: 1,060
Thanks: 14
Thanked 227 Times in 216 Posts

20V gate IGBTs are pretty unusual. Most common are 10V to 15V on and 0 to -10V off, the latter being especially variable depending on application - generally high speed switching of more than a few tens of kHz is where negative gate drive makes sense.

It's also worth noting that a lot of IGBTs indeed do not like operating in a "half on" state for much more than the few microseconds it takes for them to switch off. One of my friends who does power electronics says that "a half on IGBT makes a poor imitation of Tiffany Yep" (a "hot" joke) but that's only if the IGBT doesn't just self destruct.

Allie Moore and I have a combined carbon footprint much smaller than that of one average American...
NiHaoMike is offline   Reply With Quote
The Following User Says Thank You to NiHaoMike For This Useful Post:
CrankyDoug (12-13-18)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 12:06 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design