need a 6 volt Zener Diode

need a 6 volt Zener Diode to protect my lithium battery

will this work?

this is what the supplier says about it

1N3305B has the anode to stud

so with a positive ground system it should work, right?

is this photo right?

I'm a bit rusty on zener diodes, but doesn't the +ve strap from the battery have to connect to the +ve end of the zener ?

The other thing to consider is the specs say these are rated at 50W.
Is that enough to cope with the full output of the alternator when the battery is fully charged ?

Assuming this is for bike use ... ?

that photo I posted is wrong according to the vender, the polarities are wrong,
this is what they have to say about it.
The attached photo is wrong - the line end is the cathode, and the other is the
anode. As far as positive/negative, they are not terms used in Zener diodes -
they can be connected either way, depending on the application.



not sure I understand but.... :?

I agree....the diagram is reversed.

The stator output is 180 watts. A 50 watt Zener might be OK if you run with lights on.

I converted my 6 volt Atlas to 12 volts, and fitted a Podtronics regulator/rectifier/battery eliminator. No more worries about boiling over batteries!

The conversion is easy....just fit 12 volt lamps (bulbs).

Slick

jimbo said:

not sure I understand but.... :?

Click to expand...

Not sure I understand either.

If they are manufactured in both +ve and -ve bodied versions, like the Lucas 12v ones are,
then that surely means they have to be different ?

I assume you have to make your own heat sink for it :?:

Bernhard said:

I assume you have to make your own heat sink for it :?:

Click to expand...

yes but that's no problem

The stator output is 180 watts.

Click to expand...

At 12V yes but a lot less at 6v, but I would still be looking for 2 50W 6V zeners but they would have to be matched like they did on the 850 MK3.

Anything has to be better than the original non regulated 6V setup which switched coils in and out of circuit in an attempt to not boil the battery.

I believe that a 50 watt zener diode is not nearly adequate for your application. Even if the alternator only put out 100 watts at 7 volts that would equate to (100 /7) 14.3 amps. A 50 watt zener diode that is regulated at 6.8 volts would have (50/6.8) 7.4 amps. The zener diode you displayed is about half the wattage of what it should be and I would even go at least 50 % greater on the wattage capacity of the zener diode for the sake of reliability.

Zener diodes get really hot when reverse current flows through them. I have tested the 12 volt zener diodes using a variable voltage power supply and I was amazed at how quickly they got really hot. So they need a really good heat sink with a lot of air movement around them.

Paul Goff sells 6 volt regulators and I would seriously think about going this route instead. It is called an A REG SIX:
A REG SIX £36.95 http://www.norbsa02.freeuk.com/goffyelectrex.htm