High Voltage Inverter

Csecrist12 · Dec 7, 2022

So I have an interesting setup I am wanting to curate.

I recently picked up a few Tesla Model 3 Battery Packs consisting of 21700's cells, 355V nominal, 403V max with 78kwh capacity. These batteries are extremely sought after and I got an extremely cheap deal (good kind of cheap, not a total waste). My plan is to use the full pack (consists of 4 modules, 2 sets of 23s and 25s packs with a 46p configuration.) I am not using any Tesla software, boards, etc, instead, I will be installing an Orion BMS 96s to balance the pack.

The bottleneck I am having trouble with is the inverter side. What inverter company can have the following specs:
- Battery DC Input voltage range of 400V+
- Single phase, 120V/240V
- 10kw system or larger or parallel 2 smaller sized inverters
- Has the ability to AC couple to the grid

My ultimate goal is to have the grid become my back if any maintenance or breakdown of the battery pack happens. I want to include a generator if the grid fails, but ultimately have the battery pack handle my main loads. I have calculations done for what I am needing at the minimum. My minimum needs are 27kwh/day. This is estimated high as we are going to start a new build constructing a very tight, efficient house come this spring.

A gentleman in the Netherlands is doing the exact same thing, actually, he is leading the project as he was the one who gave me most of the knowledge for this battery pack. He is going to use this inverter from DEYE: https://www.deyeinverter.com/produc...ppt-hybrid-inverter-high-voltage-battery.html

Looks like an amazing unit, but does not have a single phase for the US grid.

Does anyone have any solution for this? I am not reconfiguring the pack to a lower voltage. I want to use the full pack. At a minimum, I may consider using the individual modules, but 2 out of the 4 modules are different voltages 1 23s and 1 25s can the inverter handle 2 different voltage readings?

timselectric · Dec 7, 2022

You will need to use a transformer (appropriately sized) to change the output to 208/120v three phase. And split your loads across the three phases equally.
Baring in mind that your (backup) grid input will only be able to feed two of the legs. So make sure that the important things are connected to those legs. Unless you can get a three phase service.

Csecrist12 · Dec 7, 2022

timselectric said:
You will need to use a transformer (appropriately sized) to change the output to 208/120v three phase. And split your loads across the three phases equally.

Will I have issues back feeding into the grid if it does not match up? My location does not supply 3 phase. and if it does, I'm sure it would be expensive to install.

timselectric · Dec 7, 2022

Csecrist12 said:
Will I have issues back feeding into the grid if it does not match up? My location does not supply 3 phase. and if it does, I'm sure it would be expensive to install.

If it a grid-tied inverter, it won't be compatible.

Csecrist12 · Dec 7, 2022

timselectric said:
If it a grid-tied inverter, it won't be compatible.

Yes. That is what I am after with the hybrid inverter is to be grid-tied. So am needing an inverter similar to the DEYE one I have in the original post, but spits out a single phase, not a three phase.

timselectric · Dec 7, 2022

Csecrist12 said:
Yes. That is what I am after with the hybrid inverter is to be grid-tied. So am needing an inverter similar to the DEYE one I have in the original post, but spits out a single phase, not a three phase.

Yes
Deye probably makes that same thing in single phase 240v. But you will still need a transformer to get split-phase configuration.

Csecrist12 · Dec 7, 2022

I'm trying to find a supplier that does have single-phase units here in the US. The research I have done shows that Sol-Ark is the sister company and uses the Deye Inverter, which just rebranded. Sol-Ark does not have an HV DC battery input inverter with a single phase.

Csecrist12 · Dec 7, 2022

timselectric said:
Yes
Deye probably makes that same thing in single phase 240v. But you will still need a transformer to get split-phase configuration.

I'm trying to find a supplier that does have single-phase units here in the US. The research I have done shows that Sol-Ark is the sister company and uses the Deye Inverter, which just rebranded. Sol-Ark does not have an HV DC battery input inverter with a single phase.

timselectric · Dec 7, 2022

Csecrist12 said:
I'm trying to find a supplier that does have single-phase units here in the US. The research I have done shows that Sol-Ark is the sister company and uses the Deye Inverter, which just rebranded. Sol-Ark does not have an HV DC battery input inverter with a single phase.

Correct
Your options are limited, but not impossible.
Deye, Growatt, and a couple other manufacturers probably make something that will work.
It's more of a commercial application. Not a normal thing for a residential setup.

Csecrist12 · Dec 7, 2022

Correct. Just need to find a supplier here in the US that has something to fit my needs. I mean DEYE does make this unit

SUN-7/7.5/8/9/10/10.5K-G | 7-10.5kW | Single Phase | 2 MPPT Inverter Company, Supplier | Deye Inverter Technology

NingBo Deye Inverter Technology Co.,Ltd is China SUN-7/7.5/8/9/10/10.5K-G | 7-10.5kW | Single Phase | 2 MPPT inverter company and supplier。 The single-phase inverter is one of the best options for residential application thanks to its smaller size an...

www.deyeinverter.com

But I don't think it has a battery input configuration.

timselectric · Dec 7, 2022

No, I don't see a battery option on that one.
For that high of a battery voltage, you will need a commercial unit.

Csecrist12 · Dec 7, 2022

timselectric said:
No, I don't see a battery option on that one.
For that high of a battery voltage, you will need a commercial unit.

Any recommendations for a light commercial inverter that has the split phase output?

timselectric · Dec 7, 2022

I don't think that you will find a unit capable of that battery voltage with split-phase output. I'm sure that you will need a transformer for whatever you find.
It's not a common use case. Your battery voltage is the complicating factor.

Sunnyboy1 · Dec 7, 2022

Megarevo has a 85v-400v DC Hybrid inverter with split phase output up to 12kw.

Product

www.megarevo.com

timselectric · Dec 7, 2022

That looks like it would do it.

Csecrist12 · Dec 7, 2022

Sunnyboy1 said:
Megarevo has a 85v-400v DC Hybrid inverter with split phase output up to 12kw.

Product

Product

www.megarevo.com

You may have just saved me on this one!

It looks to be checking out but will dive into the specs a little more. Does show it is UL certified so that's a good start.

Happen to know any resellers in the US that are reputable? I see you can get it on Aliexpress but not the most reliable site.

timselectric · Dec 7, 2022

Not clear on its export capabilities.

Csecrist12 · Dec 7, 2022

timselectric said:
Not clear on its export capabilities.

chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.megarevopower.com/upload/download/2022-09/6323e31f62008.pdf

This is the spec sheet that I have found.

Sunnyboy1 · Dec 7, 2022

Yeah I had to order it from Alibaba about a year ago. It dose have export capabilities however. Uses a CT clamp on the main feeder.

Csecrist12 · Dec 7, 2022

Sunnyboy1 said:
Yeah I had to order it from Alibaba about a year ago. It dose have export capabilities however. Uses a CT clamp on the main feeder.

So you're currently using it? What's your review? What's your setup? Was it successful ordering it from there and did it pass code here in the satets?

High Voltage Inverter

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