AZ Solar Junkie
Maricopa, AZ
Interesting it’s throwing a fault rather than just clipping…
EG4 6000 XP - Clarification on "RECOMMENDED MAXIMUM SOLAR INPUT - 10,000W"
- Thread starter itech20
- Start date
The max short circuit current is 25a.
Production stops at 17a
I understand the idea of overpaneling, but parallel string at all on these seem like a waste of energy at best, and system failure at worst
I’m getting close to placing my order for panels and all he math I’ve done seems to agree with this statement.
ChrisSwolls
New Member
definitely gonna follow this thread as I continue to add to and upgrade my setup. Solid info in here so far!
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:
A different text appears in v1.3.1, which I can currently find here:
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
AZ Solar Junkie
Maricopa, AZ
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:
signaturesolar.com
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.)
Preorder - 9.90kW Pallet - Silfab Solar 380w Mono Solar Panel (Black) | Manufactured in USA | SL-380 HC | Full Pallet (26) - 9.90kW Total
Signature Solar provides solar panels, off-grid solar systems, grid-tie, and hybrid systems. Quality solar inverters, bifacial solar panels, complete solar kits, solar batteries. Featuring brands such as EG4 Electronics with their solar battery, LifePower4 and EG4 LLifePower4 and EG4 LL
signaturesolar.com
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.)
