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DC disconnect

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Posted by Norman Dowds on January 4, 2005, 5:02 am
 
A DC disconnect is quite expensive . For a small system with a small
inverter ( <1000 w ) could one not build a custome disconnect from din rail
etc . Your comments ....



Posted by Ignoramus22732 on January 4, 2005, 5:09 am
 
I can give you a free DC disconnect from a large battery bank. It is
two pieces with one sliding into another. You will pay shipping etc.

i



Posted by Norman Dowds on January 4, 2005, 7:42 am
 Thanks for the offer . Could you please provide some descirptive information
. My circuit diagram calls for a 175 amp main disconnect which isolates the
battery from the inverter , 3 30amp breakers isolate in turn the PV array ,
Charge Regulator , and DC load distribution panel . I will also need a
ground buss and a negative buss to which I will attach a meter shunt .

Is your box a shell into which these DC breakers etc could mount ? Could you
describe what was mounted previously and approximate size .



Posted by Ignoramus28225 on January 4, 2005, 11:10 am
 
What I can give you is this

http://igor.chudov.com/tmp/disconnect/

i



Posted by nospam.clare.nce on January 5, 2005, 2:07 am
 On 4 Jan 2005 05:09:43 GMT, Ignoramus22732


Works fine for disconnecting with no load. But disconnecting DC under
load is pretty tricky. You need some sort of arc suppression.

The rerason AC is so much easier to switch is both current and voltage
are zero one every 120th of a second on 60 hz AC.


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