Need help EG4 6000xp setup

[jdmcbuilt]

I am currently in the design process of my build. My ultimate goal is to remove all my 120V circuits to a load center.
My question is about the EG4 6000XP, which has an MPPT rating of a max 440V. Is this rating for each MPPT input or the total for both?
If it's for each MPPT, could I run 6 445W 41.60v panels in series, which would be 246V?

Am I understanding that correctly?

My setup includes:

• 1 EG4 6000XP
• 1 EG4 Powerwall
• 12 445W URECO solar panels
• K2 racking system with no obstructions, and panels receive full sun all day.

I also have a grid-tied SolarEdge 7600 with a 10,400W array that provides, on a good day, 64 kWh, which would cover all my 240V circuits for the day.

 

[FilterGuy]

Is this rating for each MPPT input or the total for both?

each mppt can handle up to 440V

could I run 6 445W 41.60v panels in series, which would be 246V?

Yes

 

[jdmcbuilt]

each mppt can handle up to 440V

Yes

Thank you for confirming. Appreciate that.

 

[jdmcbuilt]

If I get 12 solarever 410 watt panels can I do 6 panels in series to each mppt?

 

[FilterGuy]

I can't answer that without the specs of the panels, but my guess is that you can.

 

[jdmcbuilt]

I can't answer that without the specs of the panels, but my guess is that you can.

 

[FilterGuy]

6 pannels gives an array Voc of 37.12 x 6 = 222.72V

+/- 25% of the array VOC for hot & cold temp extremes = 287.4V to 178.17V. This is well within the MPPT operating range so it should work fine.

Note: I use the +/- 25% test as a first approximation of the worst-case voltage extremes due to temperature. If the answer looks OK with that, I call it good.

If the +/` 25% test says the voltage might be too high or low, I do the full calculation using the temperature coefficient and record temp extremes for the area. (+/- 25% is greater than almost any panel will see at any normal temperature seen in the lower 48 states (and probably most of Alaska). Most panels will see a much smaller swing... particularly the newer 400W+ panels that have such a low temp coefficient)

 

[Recovering EE]

I guess we're to assume that Voc max is 480V...

 

[jdmcbuilt]

View attachment 230931

6 pannels gives an array Voc of 37.12 x 6 = 222.72V

+/- 25% of the array VOC for hot & cold temp extremes = 287.4V to 178.17V. This is well within the MPPT operating range so it should work fine.

Note: I use the +/- 25% test as a first approximation of the worst-case voltage extremes due to temperature. If the answer looks OK with that, I call it good.

If the +/` 25% test says the voltage might be too high or low, I do the full calculation using the temperature coefficient and record temp extremes for the area. (+/- 25% is greater than almost any panel will see at any normal temperature seen in the lower 48 states (and probably most of Alaska). Most panels will see a much smaller swing... particularly the newer 400W+ panels that have such a low temp coefficient)

Really appreciate your help. I'm pulling the trigger to buy them now. The 6000xp is awesome and works fantastic. Can't wait to pull it off the grid full time.

 

[jdmcbuilt]

Do I need to fuse/breaker the solar panels? 6 panels in series. If i do. would anyone recommend a good fuse or breaker?

 

[FilterGuy]

Do I need to fuse/breaker the solar panels? 6 panels in series. If i do. would anyone recommend a good fuse or breaker?

You do not need fuses or breakers if there is only one string per MPPT.

However, the wire sizing for solar panels is a special case. You must size the wire for 1.56 times the ISC of the panels in the string.

You can learn more about the panel fusing and wiring here:

Fusing & Wire Sizing guidelines for solar panels

To get the paper, click on the orange'' button at the top of the screen. This resource is intended to help the user understand when they need to add Over Current Protection Devices (OCPDs - Fuses or Breakers) to the solar panel array and what...

diysolarforum.com

You *do* need a PV disconnect that breaks both legs of the PV lines. Some AHJs require the disconnect to be outside. Others allow it inside and since the 6000XP has one built in you may not need to add one.