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Eg4 6000xp solar inputs

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Hyde5477

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I'm confused on the solar inputs on the eg4 6000xp. Can each mppt handle 17 amps? Someone from sig solar told me it was 17 per input and someone else told me it was combined.
 
Woolval said:
On my 6000XP PV1 and PV2 inputs, is it OK to parallel my one PV feed to them? Meaning, can I take my one PV input from my panels, then use a Y Branch parallel adapter to feed both PV1 and PV2 inputs? Is there any downside? I hope I'm being clear enough here so you can understand my question. Thanks.

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Yeah I don't think so either. You wouldn't want 2 MPPT's both trying to track from the same string. What sort of advantage are you looking to gain?

There is setting 2 - "PV input mode". You can set that to "P=same string input for 2 MPPTs". The manual doesn't really explain how that setting works - if you would wire the string to one of the MPPT inputs or perhaps that setting would require doing what you are suggesting - using branch connectors to split the strings and connect the one string to both inputs. Perhaps that setting would prevent the 2 MPPT's from being able to track separately. I haven't heard anyone discuss the scenario where that would be helpful though. Maybe if more than 17 amps are available on the string, each MPPT would pull half the available amps?
 
AZ Solar Junkie said:
2Yeah I don't think so either. You wouldn't want 2 MPPT's both trying to track from the same string. What sort of advantage are you looking to gain?

There is setting 2 - "PV input mode". You can set that to "P=same string input for 2 MPPTs". The manual doesn't really explain how that setting works - if you would wire the string to one of the MPPT inputs or perhaps that setting would require doing what you are suggesting - using branch connectors to split the strings and connect the one string to both inputs. Perhaps that setting would prevent the 2 MPPT's from being able to track separately. I haven't heard anyone discuss the scenario where that would be helpful though. Maybe if more than 17 amps are available on the string, each MPPT would pull half the available amps?
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Yes, agree, the manual doesn't give a clear explanation. I'm reading my manual now, on page 23 under COMMON SETTINGS. It does have this: "PV Input Mode: This allows the user to select the PV source for the Inverter. This can be: 0: DC source mode, 3: Two MPPT connects to same string, or 4: Two MPPT connects to different string.". (Note: There does not seem to be an APPLICATION SETTING page that I can access to make changes on)
So, from reading that, it seems I can do what I'm asking... use a Y branch parallel adapter to split my solar panel input into both MPPT inputs. My thought is this would utilize both PV1 and PV2 inputs to carry the current from my solar panel string. If I'm only bringing in solar power to the PV1 input, the other input (PV2) is unused, thereby making PV1 do all the work. It seems using both PV1 and PV2 inputs would be less "stressful" than just using one? LOL, or it could be I'm WAY overthinking this!!
I apologize for my rambling...

Update: Again, in the manual on page 47, #2... it has this:
"PV Input Type:S=two independent strings, P=same string input for 2 MPPTs. Default: S"
So the way I'm reading this, I CAN use my one string (same string) to feed both PV1 and PV2.

LOL, I sure would like someone to tell me if this is true. And if anyone is doing this.
Thanks for any and all help. I sincerely appreciate it all!
 
Last edited:
Woolval said:
Update: Again, in the manual on page 47, #2... it has this:
"PV Input Type:S=two independent strings, P=same string input for 2 MPPTs. Default: S"
So the way I'm reading this, I CAN use my one string (same string) to feed both PV1 and PV2.
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Sure looks like you can set it to parallel the MPPT inputs, I would think they then track together rather than separately.
I would keep the strings the same panels and direction.
 
littleharbor2 said:
If the single string is within the Voc and current limits then why would you want to split it?
If it is above spec then split it.
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My panels are all rated identically and angled exactly the same.

I recently split my 10s string into two 5s configuration using two MPPTs and it’s making way more power.

Reason behind my decision was shading. Before splitting, the whole string would get dragged down, but now only half will be affected while the others work full bore.

But, yes that’s a good question regarding how the inverter parallels the two strings. Does it allow current greater than 17A?
 
DIYPV said:
My panels are all rated identically and angled exactly the same.

I recently split my 10s string into two 5s configuration using two MPPTs and it’s making way more power.

Reason behind my decision was shading. Before splitting, the whole string would get dragged down, but now only half will be affected while the others work full bore.

But, yes that’s a good question regarding how the inverter parallels the two strings. Does it allow current greater than 17A?
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When paralleling one string into the 2 mppt’s half the string’s current should go to each of the two so I would think that would allow a single string with more than 17 amps, yeah.
 
AZ Solar Junkie said:
When paralleling one string into the 2 mppt’s half the string’s current should go to each of the two so I would think that would allow a single string with more than 17 amps, yeah.
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Curious how that would compare, output wise, to the same panels in 2 strings? It just seems like 2 MPPT's sharing a single string would cause sharing issues
 
littleharbor2 said:
Curious how that would compare, output wise, to the same panels in 2 strings? It just seems like 2 MPPT's sharing a single string would cause sharing issues
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I agree from a power loss perspective it would be better to split the array into 2 and have separate strings rather than pushing more amps on a single string pair. The 6000XP seems to be designed to be able to do what he is asking about though, so I don't think it would cause issues, per se.
 
Hyde5477 said:
I'm confused on the solar inputs on the eg4 6000xp. Can each mppt handle 17 amps? Someone from sig solar told me it was 17 per input and someone else told me it was combined.
Click to expand...

The MPPT is rated for a usable 17a per MPPT with a max short circuit of 25a. The max VOC will be 480 per MPPT as well. These MPPT's do not combine to grant a wider range, however, can have PV panels paralleled at the MPPT.
 
EG4_Jared said:
The MPPT is rated for a usable 17a per MPPT with a max short circuit of 25a. The max VOC will be 480 per MPPT as well. These MPPT's do not combine to grant a wider range, however, can have PV panels paralleled at the MPPT.
Click to expand...
I also notice in the specs that you cannot charge the batteries at 8000 watts you can only charge max 7000 watts 125 max charge current times battery voltage 56 = 7000 watts.
 
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