40kW worth of panels seeking hybrid inverter to match

[da9el84]

Thanks, it works great for everything I need it to now. I was glad to find that project.

I would assume the same. I highly doubt that OP needs a 40kw inverter.

I'd expect some sort of inverter to support AC loads as needed. It may or may not have an integrated charge controller. Then, multiple (or one large) charge controller for the reminder of the 40kw worth of panels.

That's a lot of PV
And now that I think about it, that's quite the unusual ratio. You'd be able to fully charge the battery in about an hour (if your battery can take a 1c charge)
I've got about 30 kWh of storage and 6kw of PV. But, I'm much closer to the equator. Maybe that's normal in Denmark.

If you're (OP) just looking for the PV inverter now and not doing the battery right away that changes the equation for me. I don't know if any all in ones that would operate without the battery, so you're probably stuck with a standard grid tie PV inverter until you add storage.

We don't necessarily need a 40kW inverter, that need was born from getting a great deal on panels along with having the space for it, with the ROI being very good if we do the majority of the work ourselves, along with a DIY battery bank - which we are doing.

As mentioned, I think we've decided to go with an MPPT RS 450/200 from Victron to supply batteries and then two Fronius Symo 20kW, might even go down to the 17's as some of the PV is going into the Victron anyway.
The all in ones are simply not worth it and too small/expensive compared to my current selection of gear.

Battery is ordered and on its way
But you are right, this is probably a very unusual size solution for residential, hence it being so damn hard to actually obtain data from vendors.
Even my own power company had a hard time answering what forms I should fill out as they had special rules for plants bigger than 11kW

 

[shavermcspud]

Unfortunately not approved for use in Denmark :S

Its on that list you posted? Ninbo Ginlong solis, there is loads to choose from

 

[da9el84]

Its on that list you posted? Ninbo Ginlong solis, there is loads to choose from

Thanks for checking, I don't know how I missed this. Iirc I went in to the lists(there are one for hybrid inverters separately) and searched both but didn't see any results. Oh well.
The Solis might be a good cheaper option, I'll look into it. Thanks again

 

[da9el84]

Turns out, our grid line in is only 3x35A So I can't sell all the electricity I want anyways, and they want 6200USD to upgrade the fuses, so we're actually thinking of not feeding the grid at all now.
Does anyone know of an inverter that does the following:
43kwh array
Support 48v homemade batterybanks(43kWh total)
Can charge from grid, but not send anything and I mean anything back
Perhaps in 2/3 physical units combined in parallel?

 

[SparkyJJO]

Does that mean it opens up more options to use, or do the inverter(s) still have to be from the list?

 

[da9el84]

Does that mean it opens up more options to use, or do the inverter(s) still have to be from the list?

Yes, that means we can go away from the lists, the inverter just cannot send anything back to the grid what so ever.
I wonder if there are other methods of achieving that, apart from the inverter supporting this.

 

[da9el84]

I reached out to MPP Solar and they have a solution(5048MGX), I just need 8 inverters in parallel to cover my array ?

 

[SparkyJJO]

Many do support it. Pretty certain Victron, MPP Solar (and other Voltronics units) support it. Growatt, etc. My Outback unit does if i wanted.

 

[da9el84]

GoodWe also has a solution(Their ES line), but again, only 5kW and I'd need 8 of them as well

 

[da9el84]

Many do support it. Pretty certain Victron, MPP Solar (and other Voltronics units) support it. Growatt, etc. My Outback unit does if i wanted.

I've looked extensively at Victron and yes they do, but I'd need so many units that costs would skyrocket. Growatt, same deal, their inverters are small and I'd need 8 units to barely cover my array. I don't know Outback, I'll check them out.

 

[da9el84]

BTW if anyone is following, Fronius replied back to me that the Tauro ECO 50-3-P Support microgrid frequency-controlled power reduction with Victron chargers.

 

[SparkyJJO]

Maybe you need to separate things out a bit. Get inverter(s) that fit your power needs, then have charge controller(s) that can handle your PV array and charge your batteries.

 

[da9el84]

Maybe you need to separate things out a bit. Get inverter(s) that fit your power needs, then have charge controller(s) that can handle your PV array and charge your batteries.

Yeah, that's also one of the things I'm thinking about. Could divide it up, have an approved inverter so I can sell some back to the grid and then have others that'll feed the house solely and the batteries. I just need to find out which units(and ideally not something I need 5+ of ) can be connected to the mains, while still being grid connected and not feed anything back to grid.

I just wanted as few units to do everything, but we might end up going that route.

 

[Bluedog225]

@upnorthandpersonal has some cheaper options to look at. See his sig line. Not sure how many you can join together.

 

[Bluedog225]

It’s funny (or maybe sad) that I think of Denmark and Finland as the same neighborhood.

 

[da9el84]

It’s funny (or maybe sad) that I think of Denmark and Finland as the same neighborhood.

Compared to the distances you keep in TX, I mean Finland isn't further away from me, than from Amarillo to Houston

 

[da9el84]

From my Finish Nordic brother, I found the company Must Power. They have an interesting device:
The PH30-12048-T. It's 12kW, supports 48v battery, only 145VDC@60A solar in though
And I can't see anywhere they list the amount of inputs/MPPTs. Also a little fuzzy on some other details like the limits they list for AC in and the AC charge

https://www.mustpower.com/wp-content/uploads/2016/05/33-PH3000-10-12K.pdf

 

[shavermcspud]

Turns out, our grid line in is only 3x35A So I can't sell all the electricity I want anyways, and they want 6200USD to upgrade the fuses, so we're actually thinking of not feeding the grid at all now.
Does anyone know of an inverter that does the following:
43kwh array
Support 48v homemade batterybanks(43kWh total)
Can charge from grid, but not send anything and I mean anything back
Perhaps in 2/3 physical units combined in parallel?

Again, the solis also does this, it has a grid tie but off grid mode where export is zero and on demand only for PV and storage.

 

[da9el84]

Again, the solis also does this, it has a grid tie but off grid mode where export is zero and on demand only for PV and storage.

True, but tiny 5-6kW units, so I'd need to parallel 7-8 units to match my array or mix multiple different models effectively dividing my array into one with inverter to handle a big load and grid tie and another to handle batteries

 

[cods4]

Check out the various Deye inverters. If you have 3 phase then two or three of their 12kW 3phase hybrid units would be good. They support a max PV open circuit voltage of 800V which will make stringing much easier than using a bunch of charge controllers.

If you have single phase, then they have a 16kW single phase hybrid inverter that isn't listed on their website, but should be available now or pretty soon. 2 of those should work.

I guess if you are now planning to be off grid the time control would no longer be of any concern, however Home Assistant and Node-red would be my suggestion. Victron would probably be the easiest to control in this way. However I am planning to try and control my Deye inverters in a similar way. Not 100% sure it will work yet though.

I'm in New Zealand and we also have various time of use tariffs depending on which electricity retailer you use and where you live.