question

I don't understand your point. You say you have a working solution with the LMW - whatever that is. Why don't you use this? Add some more MOSFETS in parallel to the output for higher current switching and thicker wires / connections. You can use the output of your LMW (whatever that is) to control a analog regulator and the power, or you can add more LMW in parallel, one per heater.

Hi Johann,

the difference is: The old unit regulated 24V up to 1000 W. The new one should handle about 5-6 kW at 230V (as the current would not be easy to handle when I stay at 24V). And: the old circuit has burnt long time ago...

Martin

use a variable speed drive to power the heater. This will convert the excess AC power to dc, then back to AC using variable amplitude and frequency. Pick a model with external or remote speed control. Your heater will not mind the frequency, and the voltage should be controllable from about 80V or so to 240.

Hi Mike,

yes, such a kind of regulator might work, too. But how should it be automatically regulated by the voltage of the battary? And isn't it more expensive than my idea with a microcontroller and some thrysistors?

Martin

Not if you have to pay someone to do it for you, I guess.

Have you explored the options of the assistants on your Quattro?

You can program the outputs to do crazy things based on data, you can also control AC output 2 and use it to control your heaters.

Johann,

as I did not want to pay someone for doing it for me/for us/also for himself, I asked my question here in the forum... ;)

I'll have a look at the capabilities of my Quattro - until now I did not remember that it is capable of giving a PWM or other kind of regulated signal. But I will check it, thanks!

Anybody else who feels addressed or curious?
Martin

Johann,

I digged through the manuals of the Quattro and VE Configure, studied the virtual switches and the assistants, but I did not discover any possibility to drive a voltage-sensitive PWM- or only simple analog output. But I could not find anything about programming the analog or digital in- or outputs, perhaps here is a possible way?
Does anybody know?
Thanks,

Martin

https://m.youtube.com/watch?v=tJGP3G0P7no

There is a video on how to divert dump loads ...

Yes, Johann,

this video shows using a relay that diverts energy to a dump load when -for example- the batteries are full enough.

That is what I do already since years, even with three relays in three steps. But, as I explained, even three steps are kind of rough: If I do not want the relays to switch off and on at each small cloud, I can use some delays, but then the batteriy is stressed by the dump load for some time though just moments later the sun is back again and loads the batteries again. So I have a continuous up an down that is not useful. If a regulated dump load would be loaded with only that power that is excessive, my batteries would be treated with more care and live longer.

There is no excess energy in the circuit you can divert, if a charge source can provide more than a load or the battery can accept, it just provides what is needed and relaxes.

The only way you can force it to work is to increase the load. What you can do, is measure the charge current and increase the load to keep the charge current at zero or as low as it gets when you divert the power, can be done by a PIC like an ESP32 with a AD converter at the shunt or by reading the charge current from a BMV or Cerbo (then delayed, and would make ripple)

You can then either use PWM or a DAC to control and regulate your load via a TRIACs or MOSFETs.

You can stop the charging this way at any point (based on SOC preferably during BULK, so the charge controller doesnt go to sleep in float) and dump all available energy into your dump load.

Hope that helps you..

Yes, Johann, you are right again:

In my very first text up here I wrote: "I think first I need a voltage devider that gives me the excessive voltage out to feed an OpAmp or a microcontroller that gives out PWM signals to drive a thyristor-power-regulator array / phase conrtrolled modulator."

I already have an idea what should be done, but I asked here for help for the precise layout....

Martin

Hello,

I pick up my own thread here after some struggle with my problem...

Some of you might have heard about the AC-Thor, which is an power diverter/dumpload regulator that can turn up to 9 kW electric power into heat.

It is very good, versatile, but not cheap.

And, theoretically, it shall work together with the Victron inverters that have the capability to rise the net frequency when the batteries are full.

So far, so good.

I bought a AC-Thor 9s and regulated it with the AC-inverter-frequency-regulation assistant of my Quattro. But unfortunately this frequency regulating assistant is entirely useless for this controlling as it rises the frequency but sometimes does not decrease it in time, so that it may happen that the AC-Thor powers the batteries empty, because the Quattro says him to do so.

And unfortunately too, Victron does not care about this problem at all. Since a longer time.

I solved the problem by regulating the AC-Thor directly via a Voltage-to-PWM-Module built myself with a ESP32.

So after nearly two years I found a solution that is not simple but feasable. And I had to face some frustration with the lack of service of Victron.