question

@jsrmorgan. As far as I understand, the problem you have is, that your wind-generator controller cannot be regulated by your multi for what it needs to produce to charge your batteries. I would implement something like a "over-voltage switch" that, when the voltage on the MPPT side gets to high because the batteries are close to fully charged and the windturbine is pushing the voltage over the charge limit, because of the output of your wind-turbine, it would switch off your turbine input.

Hi i like you have decided to do this as a "top-up " measure as i too are at 100% charge between 10 & 12 everyday, i have a controller that came with my wind turbine, once the batteries get to a set voltage the Wind Turbine Controller turns the turbine off, once it drops below a set voltage the Wind Turbine Controller turns the turbine on, i run this through a separate SmartShunt so i can see exactly what it produces.

I personal would not "parallel the wind turbine controller up to the battery side of one of the MPPT controllers" but run as i have see pic below. Not saying it would not work just personal preference.

So far this has worked for me but the key is to have a Wind Turbine Controller that you can setup and protect your batteries.

Educate yourself on wind and use this calculator to sanity check any claims made by turbine manufacturers:

https://www.omnicalculator.com/ecology/wind-turbine

Some of the claims are outrageous.

I assume, that your Wind Charger has a remote break contact, hence you can use the Cerbo GX to stop the windmill, if the Battery has reached the optimal voltage.

Forgotten one thing:

I am Off-the-Grid in Estonia, with SOPzS Batteries 24V/2940Ah (waiting for the upgrade to 7320Ah since my farm is now much bigger) using a MultiPlus-II 24/5000 and heavy DC loads.

I run two SmartSolar systems with 1860Wp and 2460Wp and use in the same time 3 windmills 2000W and two windmills 700W (same repeller as the 2000W ones) and I get just enough windenergy that I can keep things alive!

Jeah, in January 9-18 I got from 2 windmills 2000W and one 700W over 113kWh, hence more them 12,5kWh a day. While my power consumption is in the winter around 7-8kWh a day, I could nicely charge my batteries.

BUT THIS IS AN EXCEPTION

NEVER TRUST WINDMILL MANUFACTURERS.

However hight matters, my windmills are currently only 4m high and I have an open field, but since the original masts are crap (I have currently two broken ones) I will make the masts from 6m standard S355 60mm pipes my self in one piece and not many 1m pieces which have to screwed together and break at the treads.

Think about.

P.S.: 6m high windmills is the physical maximum, what you can handle if you have to maintain it alone.

Hi Everone,

Thanks so much for all the comments and ideas.

Sorry I haven't been able to respond until now but Im back online and loving all the feedback. Thanks Nesswill for the suggestion of wiring in a separate battery monitor, makes much more sense.

I still haven't got my turbine up and running yet, Im having problems finding the right charge controller to go with the 48volt LifePo4 batteries and 1500Watt turbine Im using. Istabreeze ( where I purchased the turbines) have a controller but the parameters are factory set and non adjustable to the end user so that doesn't work for me. Tesup here in Australia have a controller that I think would do the job but their support page doesn't allow any direct communication until you make a purchase? I have emailed them in England but they don't respond so if anyone has any info on charge controller manufacturers that would be awesome.

Cheers

Morgs

Hi Nesswill, wow yeah I had a bad feeling about that mob.

thanks heaps for the heads up and info mate, your a bloody legend.

Cheers

Morgs

Absolutely spot on Dave

thanks again

We have been using Victron MPPT 250 / 100 charge controller on our wind turbines. there is a way that exports the dc power with little to no spikes, so the controller assumes it is DC solar input. The critical path is to place a Capacitor bank before the controller. This will smooth out the DC and better allow the Controller to react to the wind turbine. The most common capacitor to use for wind systems are a set of 4 or more 450 volt / 470 Uf capacitors, available on ebay.

You can also insert a DC regulator that can be set to a specific voltage range.

The image below connect 3 turbines into a single controller.

img-2402.jpg(2.6 MiB)

In case of emergency, he is running as hell...

...and pull the BREAK SWITCH!