Homebrewed Electricity > Frequently Asked Questions (FAQs)

Revisiting rectifiers

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pellets4fuel:
I did a fair share of searching past posts on rectifiers.  Learned quite a bit.  Most of the posts are older though, so I thought maybe some new insight has come up.  I have a 12ft machine that I built.  I have the tower and concrete for it done, and will start raising things in the near future.  I need to come up with a rectifier yet though.  Dans' book spells it out pretty plain how to build one, but I am still a little intimidated, and time is also precious.  Is anyone here building them to sell or could you point me in a direction of at least a pre crafted rectifier.  Someone in past posts said check out henhugger on ebay.  His user name comes up, but he don't have anything listed for sale.  I am hoping to find something complete maybe with a box and shorting switch built in.  I did price out the ones Midnite solar made with the rectifier and 3phase breakers for shorting.  They made them for the Bergy XL.  Bergy still has them in stock.  Seems a little much for what it is, but maybe not. 545.00 is what they told me.  I am not sure the rectifier in that box would be big enough though.
Also wondering if anyone has suggestions or a link to what to use for a weather proof e-stop switch at the base of the tower, and an approach to installing the kellum grip for the chord going down through the yaw bearing cap.
Thanks!
David

JW:
Not sure if this will work

http://www.ebay.com/itm/100-NEW-THREE-PHASE-RECTIFIER-BRIDGE-DIODE-MODULE-300AMP-/251144438912?hash=item3a79600480:g:pwYAAOSwYshUZ8CW&vxp=mtr

JW

pellets4fuel:
JW
Thanks for that link back in Dec.  Wanted to just comment on this thread to bump it to hopefully get some more input on my questions.
Thanks!
David

pellets4fuel:
Does anyone else have any input on this "old" topic?  The ebay link comes up fine, and I could get that one.  Would one suffice, and is the heat sink on it big enough, or would a bigger one be better?
Are there any other options like say one out of a car or truck alternator?
Thanks!
David

XeonPony:
Old but I'll post my bit:

1 - General rule is size it  2 times the continuous load

2 - All ways use way way more heat sink then it needs or that you think it needs

3 - Securely mount them and keep wiring clean

4 - Fuse both AC and DC side if a diode lets go there will be smoke and or flame if not it just explodes! Fuses and shut offs are very good at this point!

5 - Check them from time to time, how often is your choice me it tends to be once a year, remove weak ones be, for they go.

6 - Stud mount units will hurt the pocket book at first but will out live you, not to mention easy to test! Further more easier to mount to a nice massive heat sink! So well worth the initial investment.

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