Anti-return diode and wind generator

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Beran
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Anti-return diode and wind generator




by Beran » 29/11/22, 22:12

Bonjour.

A question about anti return diodes.

I have a 24v battery bank, a 24v 600w generator found on the wind farm.

The generator is driven not by the wind but by the water, a small pelton wheel.

Problem I can not load the park.

I had installed a suitable wind regulator, an mptt, and the same. It shows no errors. Once the circuit is closed I have the same park DC voltage on the terminals.
DC voltages are taken open circuit at the generator using a rectifier.
I adjust the flow to have a voltage oscillating around 27-28v. (if I fully open the tap I go up to 70v).
In terms of the electrical installation, I installed a second rectifier before an AC circuit breaker to measure the voltage before closing the circuit.
Once I open the circuit the voltage drops to 25V.
This is the voltage I have at the park with any electrical device off.
If the circuit is closed, at the generator, I gradually open the tap to the bottom, the voltage does not change and remains at 25v.

I conclude that this one is like braked...

I try a method, I directly connect the positive and the neutral of the rectifier on the terminals of the park, I forget the mptt.
Same results...

It only remains for me to try a non-return diode on the positive between the rectifier and the park.
I read this solution which for some works and which for others is useless. The logic being that the input voltage is higher than the voltage of the battery bank... but a priori it does not work that way.

If the anti-return diode works, I plan to install a morningstar regulator. The advantage of the latter is that it has a function of shedding excess current on the park in order to prevent it from heating up, bubbles and boom.

What do you think of this little diode?
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izentrop
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Re: Anti return diode and wind generator




by izentrop » 30/11/22, 00:42

Hi,
Beran wrote:anti-return diodes
No use, the MPPT or the diode bridge already prevent any return to the wind turbine
Beran wrote:a 24v 600w generator
If the pelton is capable of supplying the power, it can charge a 24 V 250 Ah lead-acid battery without requiring regulation, except to cut off the load at 28 V and then switch to trickle charge mode.

What needs to be measured is the charging current, which should be around 20 A if the pelton and water flow are properly matched.
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Beran
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Re: Anti return diode and wind generator




by Beran » 30/11/22, 07:32

That's what I tell myself...

Here is the link of another forum where I saw this anti-return diode story: https://25ansautourdumonde.blog4ever.co ... hasee-12-v

My park has a capacity of 190Ah all the more so.
What I find curious is that open circuit I can almost quadruple the nominal voltage of the generator and closed circuit I remain stuck at 25v, 23v etc always at the same
Tension of the park whatever I do, Mppt or not... and that I don't understand..

I have a clamp ammeter that measures AC and DC currents.
I have trouble taking the measure on the positive in DC.
The display of the latter is like this: 00.00

When there is for example in my case 00.13 should I understand 13A or 0.13A?
Because 0.13A at 24v would surprise me but it's just to be sure.
This measurement is taken on the generator phase for information.
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Re: Anti return diode and wind generator




by izentrop » 30/11/22, 08:09

Beran wrote:When there is for example in my case 00.13 should I understand 13A or 0.13A?
Because 0.13A at 24v would surprise me but it's just to be sure.
This measurement is taken on the generator phase for information.
It all depends on the caliber.
What is the reference of the clamp and the wind turbine?

A wind turbine must spin fast enough to deliver 600 W, like 950 rpm. What is the speed of the pelton?
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Macro
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Re: Anti return diode and wind generator




by Macro » 30/11/22, 09:11

I also think quite simply that the problem is that your generator does not turn fast enough or that your system is not supplied with enough water.
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Beran
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Re: Anti return diode and wind generator




by Beran » 30/11/22, 10:31

Here is the clamp:

https://www.manomano.fr/p/multimetre-pi ... at-4285413

Its speed of 650 rpm.
At max I am in the 1600 rpm with the pelton.
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Re: Anti return diode and wind generator




by Macro » 30/11/22, 10:43

Either your generator is not sufficiently trained or your charge regulator is messing up...

Have you simply tried to connect a bulb something like 24V 100W (truck headlight bulb for example) on your generator to see if it lights up correctly
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The only thing safe in the future. It is that there may chance that it conforms to our expectations ...
Beran
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Re: Anti return diode and wind generator




by Beran » 30/11/22, 10:52

Macro wrote:Either your generator is not sufficiently trained or your charge regulator is messing up...

Have you simply tried to connect a bulb something like 24V 100W (truck headlight bulb for example) on your generator to see if it lights up correctly


I did not try. I'll see if I can find a 24w bulb over there.
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Re: Anti return diode and wind generator




by izentrop » 30/11/22, 11:02

2 headlight bulbs in series
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Re: Anti return diode and wind generator




by izentrop » 30/11/22, 11:05

Beran wrote:Here is the clamp:

https://www.manomano.fr/p/multimetre-pi ... at-4285413

Its speed of 650 rpm.
At max I am in the 1600 rpm with the pelton.
If you measure 00 on the 2A caliber, there is really a big problem.
For speed, is it theoretical?
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