EG4 6000 XP - Clarification on "RECOMMENDED MAXIMUM SOLAR INPUT - 10,000W"

itech20 said:

As it happens, I've discovered a different and newer version of the manual that seems to clarify that clipping is above 17A, not 25A.

The text I wrote out earlier in the thread is from v1.1.7. I can still find that here:

https://signaturesolar.com/product_images/EG4%206000XP%20Manual%20-%201.1.7.pdf

A different text appears in v1.3.1, which I can currently find here:

https://eg4electronics.com/backend/wp-content/uploads/2023/10/EG4-6000XP-Manual.pdf

The OLD text (which I quoted above):

Max Usable Current - 17A - "The MPPT will operate most optimally at this amperage"
Max Short Circuit Input Current - 25A - "The MPPT can accept up to this amperage(clipping will occur past this value)"


The NEW text:
Nominal MPPT Amperage - The MPPT will operate most optimally at this amperage - 17A
Maximum MPPT Amperage - The MPPT can accept up to this amperage (clipping will occur past 17A) - 25A

Click to expand...

Yeah I noticed that too. It seems based on reports from others that the newest version of the manual is correct.

So... Is it safe to say that a reasonable approach with these inverters is for each string to be somewhere around 350V, 11.5 amps? In other words, try to stay well under the voltage limit (to protect the unit) but not so far under (say, under about 235V) that you start to hit the amp max? These inverters seem to really like the Goldlocks middle.

I have two 6000xps. One has 16 Philadelphia Solar 445 watts, 8 on each MPPT. 310 / 330v @ 11.5amps equals 3500 watts per MPPT. On rainy days when the sun comes out of a cloud it would get almost to 4000 watts per MPPT. No problems at all. My second 6000xp only has 3 545 watts Boviett Solar Panels. 120 / 125v @ 12.4amps I've seen 1450 - 1650 watts, Both working perfectly at this time.

If I follow through with my current plans, I will have another data point here. I intend to have at least one 7s2p string of this Silfab part:


The Isc is 11.36 and the Ipmax is 10.77.

My logic, to this point has been that 11.36 * 2 = 22.72 which is less than 25, the stated amperage limit.

@dougadvrider's experience described earlier in the thread seems to imply that his panels in a 2p configuration are somehow operating significantly above 2x the Isc, and that is one working theory about why he is getting these errors. (That is, based on wattage and voltage calcs, his string seems to be going above 25 amps.)

I don't know if he and @EG4_Jared have arrived at any firmer conclusion on root cause here. (And it sounds as if he may be planning to avoid any real risk of hitting the amp limit by eliminating his parallel strings.)

I ordered Qty 16 of these blue sun panels for my two 6000xp’s. With an 8s configuration I should get around 330volts at 11.5 amps. I’ll report back here on what I’m getting here in Michigan.

Due to availability I ended up cancelling that order and placed an order o qty 16 of these Boivet panels. I’m live now with these panels with 2 strings of 8. I’ve been observing somewhere around 300-330 volts and amperage peaking at 11.5 amps. I’ve seen power as high as 7.5kW. Pretty sure I’m getting some current boost from the bi-facial side of the panels.

Pretty cool to see my system producing energy.