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Originally Posted by Larry W4CSC
vic wilkinson wrote in
:
Hi: I am a uk manufacturer of galvanic isolators 70 amps rated &
supplied with or without status monitor : Our website is
www.galvanicisolators.com :may i suggest you look at our helpfiles &
I'm sure you will find valuable information within: please note : we
construct & test our isolators to a very high standard not easily
attained by d.i.y. projectors. heat sinking is vital & quality of
components must be a1. isolators are a safety device & must be treated
with great respect!I hope the website is of help to you ..Regards
.Vic..If You need further advice please email
Hmm....If we take a Micro Commercial Components MP5005 50A 50V bridge
rectifier ($6.40 in single quantities, under $5 if you buy 100 at a time
from DigiKey) and bolt it to a single hole heatsink ($3 at any electronics
parts house, cheaper if I buy heat sink on the surplus market) we can
create a 1-component galvanic isolator by simply connecting our in/out
green ground wires to the AC posts on the beast and shorting out the + and
- DC posts, effectively putting two 50A diodes in series (1.2V drop) going
each way (4 diodes in the single phase bridge rectifier)......total cost $8
and change plus a little shipping...(c;
Because the heat sink of this bridge is isolated from all the posts, we
could just bolt it to the inside of a metal power panel and use that as a
heat sink, getting our parts count down to ONE and reducing our assembly
time to near zero! All we'll have to do is repackage them in a fancy box
with a boat looking logo. The only time it gets warm is when there's a
short to ground for a few milliseconds before the shore power breaker
trips. This device will stand a 400 amp repetitive surge at 50/60 Hz.
Now if I can get gullible boaters to pay $299 for the "marine" version
painted blue with the anchor or ships wheel logo stuck to the side of it, I
can make a tidy sum of $280-290 per unit for my trouble....minus Waste
Marine's cut if they buy it to resell.
Not bad at all. Just use the same disclaimer this guy uses saying I'm not
responsible for anything that happens to boat or boaters if he uses this
device. Hmm...I got a DigiKey account....(c;
Special discount to rec.boats.electronics posters, of course, $159.95 plus
shipping....(c; Buy direct from the manufacturer, "Marine Protection
Division", AmpZ Electronics...ME!
(c; |
If only life were so simple!!!!
to manufacture isolators they must be ce approved & pass many application tests. They must be able to withstand dc currents (not just ac currents) & must have heatsinks capable of withstanding high temperatures for prolonged time (not milliseconds as you state!) Potential installers must be aware that this is a safety device & must be constructed to a high standard. Diy is fine but its a case of buyer beware!....If you are not 100% confident in your ability to construct a safe isolator then buy a commercial one... Our 70 amp isolators retail @£59.99 & our version with remote status monitor @ £79.99.
if you need further info log onto
www.galvanicisolators.com.