the 3rd battery
Submitted: Saturday, Sep 23, 2006 at 18:53
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Member - Crazy Dog (QLD)
Ok guys and gals......
Have a battery in the campertrailer now and intend fitting a power diode cathode stud mount to the +ve terminal to stop feeding back to the vehicle. The battery is an 85ah SLA - what size diode do you think I should use. Running 110lt fridge and some lights.....all 12v...
Grrr!!!
Reply By: HJ60-2H - Saturday, Sep 23, 2006 at 20:35
Saturday, Sep 23, 2006 at 20:35
I have sucessfully used AIB:80.06 diodes from AEGIS for exactly this purpose on a previous "made not bought" isolator. I can't recall what they were rated at but is was in excess of what I needed at the time.
AnswerID:
196163
Follow Up By: HJ60-2H - Saturday, Sep 23, 2006 at 20:35
Saturday, Sep 23, 2006 at 20:35
PS: I still have a couple of spare ones
FollowupID:
454372
Follow Up By: Member - Crazy Dog (QLD) - Saturday, Sep 23, 2006 at 21:56
Saturday, Sep 23, 2006 at 21:56
Yo my man,
Who and where is AEGIS - I was unable to find using Google.
Have u a pic of the diodes and how much do u want... R They cathode stud?
Grrr!!!
FollowupID:
454381
Follow Up By: HJ60-2H - Saturday, Sep 23, 2006 at 22:09
Saturday, Sep 23, 2006 at 22:09
They are in the shed. Let me have a look in the AM. I can't recall wether they are cathode or anode stud. If you give me an email address I can send you a photo.
I bought them from an electrical engineering
shop in
Sydney after much digging around. It was hard to find high current ones, all the usual component suppliers topped out at a few AMPS. Cant remeber what they were worth, prolly $5 or $10 each at a guess.
FollowupID:
454383
Follow Up By: Member - Crazy Dog (QLD) - Saturday, Sep 23, 2006 at 22:15
Saturday, Sep 23, 2006 at 22:15
fantastic...
Look forward 2 hearing from U...
Lance
Grrr!!!
FollowupID:
454384
Follow Up By: Member - Crazy Dog (QLD) - Saturday, Sep 23, 2006 at 22:39
Saturday, Sep 23, 2006 at 22:39
sorry "lancewl@bigpond.net.au"
Grrr!!!
FollowupID:
454389
Follow Up By: Oz Travellers - Sunday, Sep 24, 2006 at 09:05
Sunday, Sep 24, 2006 at 09:05
Diodes. Don't forget that a silicon diode can have an inherent forward voltage drop of 0.6V, which can be a significant proportion of 12V! Sparky
FollowupID:
454419
Follow Up By: HJ60-2H - Sunday, Sep 24, 2006 at 09:51
Sunday, Sep 24, 2006 at 09:51
Yep, I built in this voltage drop into the design when I used them in my project. Those nice Ingram adjustable voltae regs allow you to take another angle on accounting for this as
well.
FollowupID:
454429
Reply By: HJ60-2H - Sunday, Sep 24, 2006 at 09:44
Sunday, Sep 24, 2006 at 09:44
I took a look and I actually have both cathode and anode stud types. One has the part umber R4150670 (anode stud) on it which comes up on a Google search to a supplier in the USA who sell them.
Sent you a photo of the pair of them as
well.
AnswerID:
196197
Follow Up By: Member - Crazy Dog (QLD) - Sunday, Sep 24, 2006 at 11:09
Sunday, Sep 24, 2006 at 11:09
Thanx - look forward 2 same.
Grrr!!!
FollowupID:
454435
Reply By: Derek from Affordable Batteries & Radiators - Sunday, Sep 24, 2006 at 21:13
Sunday, Sep 24, 2006 at 21:13
Hi Crazy
Best to use a voltage sensing relay / solenoid.
There is too much voltage and current lost through diodes.
Regards Derek.
AnswerID:
196297
Follow Up By: HJ60-2H - Sunday, Sep 24, 2006 at 21:17
Sunday, Sep 24, 2006 at 21:17
How does current get lost in a diode? I understand the voltage drop on forward bias but not current loss.
FollowupID:
454540
Reply By: Derek from Affordable Batteries & Radiators - Sunday, Sep 24, 2006 at 21:27
Sunday, Sep 24, 2006 at 21:27
Voltage loss / drop will decrease your charge rate / current.
Send me you email and I will send you a graph.
AnswerID:
196303