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Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 11:36pm 25 Mar 2015

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Is there close related substitute item for IRF9Z34 Mosfet, or this is the only thing to be installed here?

George

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 11:53pm 25 Mar 2015

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I found this item:

IRF9Z34N IRF9Z34NPBF 9Z34N MOSFET P-CH 55V 19A

Are those extra letters a worry, or this is what I need?

Letters in question: N , NPBF , Or if it is without IRF ?

George

VK4AYQ
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Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 01:54pm 26 Mar 2015

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Hi George

Not sure mate too many numbers confuse mee.
I will have a look at spec sheets on google tonight and get back to you.

Bob

Foolin Around

VK4AYQ
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Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 02:01pm 26 Mar 2015

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Hi George

Looks like it is a P channel

Bob
More
Manufacturer: International Rectifier
Product Category: MOSFET
RoHS: RoHS Compliant Details
Id - Continuous Drain Current: - 17 A
Vds - Drain-Source Breakdown Voltage: - 55 V
Rds On - Drain-Source Resistance: 100 mOhms
Transistor Polarity: P-Channel
Vgs - Gate-Source Breakdown Voltage: 20 V
Qg - Gate Charge: 23.3 nC
Pd - Power Dissipation: 56 W
Mounting Style: Through Hole
Package / Case: TO-220-3
Packaging: Tube
Brand: International Rectifier
Factory Pack Quantity: 50

Foolin Around

VK4AYQ
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Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 02:10pm 26 Mar 2015

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Data sheets both appear to be the same component, just different makers.

Bob

2015-03-27_000810_IFR_9z34.pdf

Foolin Around

powerednut

Senior Member

Joined: 09/12/2009
Location: Australia
Posts: 221

Posted: 04:32pm 26 Mar 2015

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the additional letters on the end often refer to small differences in the capability, or package of the component. Just check the datasheet, which will normally specify what they mean.

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 10:55pm 26 Mar 2015

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Thanks for help.

looks I have one less part to get, not far now !

George

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 03:47pm 30 Apr 2015

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I have to get two more components.

In a meantime got "battery rejuvenator" as present, so cannot complain.

It is connected to batteries during day when solar panels produce power and when I don't charge anything as spikes could damage charged items.

It stops working when batteries drop below 12.6V, but I try to have batteries above 13V when Sun goes down.
Overnight voltage drops to 12.8V

All good !!

George

rustyrod

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Joined: 08/11/2014
Location: Australia
Posts: 121

Posted: 04:15am 18 Jun 2015

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Hi George,

Have you got them going yet?

Mine are still singing away.

When I find my camera I will post an update on VK4bob's desulfator topic.

Always Thinking

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 01:20am 10 Jul 2015

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Hi Rustyrod,

Sorry to say that I still did not collect all the items.
Returned thoroid to JayCar and didn't order replacement yet.

Need Mosfet to order too.

In a meantime I use this "Battery Rejuvenator" from time to time.

Also now I have in total 3 12V batteries in parallel and with the last addition all batteries have almost 13.1V in the morning.

From time to time I let them get up to 15.5V for a while, as if it is any higher I can hear my AGM starting to gas.

Before I charge phone or tablet I let the voltage drop to less than 13.5V as I am not sure if USB charger can handle too high voltage on the intake side.

George

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 10:59pm 20 Jul 2015

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I can get some Resistors 0.25W

Are they acceptable for this project, or they must be at least 0.5W or higher?

George

rustyrod

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Joined: 08/11/2014
Location: Australia
Posts: 121

Posted: 11:28pm 20 Jul 2015

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I used .25w on R 1 - 2
then .5w for R 3 - 4.
but use the .25w and see how it goes.

But then on another unit I have some resistors that were salvaged and are 3.5/4mm long and 1.5/2mm thick, they are quite happy. Are they 1/8 watt?

Always Thinking

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 12:14am 21 Jul 2015

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As you say Rustyrod I can try and see.

I even thought to put two 0.25W resistors parallel, to my thinking they will let 0.25W each, so in total they will at handle 0.5W.

Problem is if Ohms' Law agrees with it too?

Mosfet should be IRF9Z34

I see that there are some: IRF9Z34N or IRF9Z34NPBF
Are those OK too, or it has to be specifically IRF9Z34 ?

George

rustyrod

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Joined: 08/11/2014
Location: Australia
Posts: 121

Posted: 02:12am 21 Jul 2015

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Yes ohm will agree, two in parallel will double the watts BUT halve the ohms

two (say) 1 k in parallel will give you 500 ohms.

therefor to get back to 1K you will need two 2K resistors.

PS. no two resistors will be EXACTLY the same unless you get 1% tolerance and spend 1/2 a day measuring them. Then if the temperature changed, you can start again.

10% resistors are "good enough" for this project.

Always Thinking

Georgen
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Joined: 13/09/2011
Location: Australia
Posts: 462

Posted: 12:01am 12 Aug 2015

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Bit slow getting parts.

Two more parts and I'll be able to start making it.

George

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