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Author Topic: LVD low voltage disconnect on 24v wind turbine  (Read 2233 times)

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Drnaline

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LVD low voltage disconnect on 24v wind turbine
« on: March 11, 2016, 12:40:59 PM »
I searched the forum, didn't find any thing relevant. I added a second turbine to my system and naively put an under sized diode. Which burnt and feed back, killing by battery bank. Was able to save two of the battery's, the other two were junk. Batteries are 8D commercial 12V.
    Replaced the two bad ones. And was scared to restart the system without some kind of protection. First thing to come to mind was low voltage disconnects which disconnect anywhere from 10.8 to 11.2. But most if not all LVDs I see have over voltage protection. They will cut off at a certain voltage like 32-35v. I have seen my original turbine put out at much as 37-38 volts on a digital readout.
     Is it dangerous to have this type of cut off at that high of voltage?

all questions, comments and suggestions are welcome.     







 
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SparWeb

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Re: LVD low voltage disconnect on 24v wind turbine
« Reply #1 on: March 17, 2016, 01:49:20 AM »
Don't put a disconnect on a wind turbine circuit.  It will just cause the turbine to spin freely, speeding up until it sheds its blades.

Select a better diode that can handle both the voltage and the current.  Best to find one that can be mounted on a heat sink.
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David HK

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Re: LVD low voltage disconnect on 24v wind turbine
« Reply #2 on: March 17, 2016, 03:55:30 AM »
A fellow named Ghurd made up some circuits for low volt disconnect and dump load. Same circuit but different value parts. It was designed for 12 volts DC.

Go to this URL on this website and you can see what he produced. He mentions the following:-

The 24V modifications have not been tested.  So this is all theory.

I don't see why it wouldn't work.

The trace between the empty holes needs cut.

A 14 or 16V 1W Zener is soldered into the holes.

ZD1 is changed to 19V.

R1 is changed to 7.5K.

RX maybe 20K for a dump load controller, 1.8K for LVD.

Possibly a small cap paralleled with the 16V 1W Zener, in the same holes.

Remember. 24V has NOT been tested. All theory.

Also do a search on this website - Ghurd - and send him a PM. He is a very helpful chap.

Dave
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David HK

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Re: LVD low voltage disconnect on 24v wind turbine
« Reply #3 on: March 17, 2016, 03:56:59 AM »
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Bruce S

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Re: LVD low voltage disconnect on 24v wind turbine
« Reply #4 on: March 17, 2016, 11:32:34 AM »
Here is GHURD's direct website.
http://ghurd.info/
I still use the units , they are about as set'em and forget'em as you can get.
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Drnaline

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Re: LVD low voltage disconnect on 24v wind turbine
« Reply #5 on: March 17, 2016, 11:41:16 AM »
A little more info might help. I have a 440 amp battery dump, wind/solar controller. I have eight 300w resistors wired to the dump load. 2500w inverter.
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