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diy solar

Need help with parallel Lv2424 setup

Jerryonthego

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Jun 20, 2020
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Hi All. Hoping to benefit from all th experience in this forum. I am new to solar and have been working on setting up solar in my shed. I have 8 435w panels connected (4P) to each LV2424 unit. The units are connected to a 14KWh battery bank. Each LV2424 unit works fine independently, however together (in parallel split phase) when I turn on the inverters and add a load, it trips my AC input breaker. One thing to note is that I plan to make this fully off grid, however I have both units connected to the same circuit for AC input. Not sure if that is the issue. The AC IN runs fine at 120v when the inverter is turned on… however once a load is added, my AC IN breaker (Gcfi outlet) is tripped. I’ll add some pictures shortly.

Please let me know what other info may be needed that I have left out. Apologies, new to this and have been looking for answers, but can’t seem to find a solution.

Battery info:
Lifepo4 24v
User settings (Will Prowse recommendations)

Thanks !!!
 
Assuming typical voltages, I would expect you might get better performance with 2S2P arrays.

Hybrid model?
Configured for 120/240VAC split phase?
Grounded properly (I don't think you're supposed to bond N & G at the inverter)?

Sounds like adding the load completes a circuit that shorts to the input through G or N.
 
Assuming typical voltages, I would expect you might get better performance with 2S2P arrays.

Hybrid model?
Configured for 120/240VAC split phase?
Grounded properly (I don't think you're supposed to bond N & G at the inverter)?

Sounds like adding the load completes a circuit that shorts to the input through G or N.
Hi the panels have a VOC of 85 so I cant have more that 1 in S. As for the config, I configured option 28 for 2P1 and the other unit for 2P2.
 
Hi the panels have a VOC of 85 so I cant have more that 1 in S. As for the config, I configured option 28 for 2P1 and the other unit for 2P2.
 

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Ah. Atypically high voltage panels, but is in the MPPT range. Cool.

Unfortunately, your pictures don't make it clear.

Where do the black wires coming out the top of the box go?

why is one of the neutral's loose?
 
Ah. Atypically high voltage panels, but is in the MPPT range. Cool.

Unfortunately, your pictures don't make it clear.

Where do the black wires coming out the top of the box go?

why is one of the neutral's loose?
I’ll take some better pictures. The black wire on the top is for a 20amp PDU and is the wire coming in from the top of the breaker box and connected to one for the 20amp breakers. As for the neutral, it is connected… but I should shorten it. Apologies in advance….. extremely new to this.
 
You need to the AC input to be different phases of your AC panel. Each phase from your AC panel needs to feed a separate mpp unit. You said that your AC input is on the same circuit, I think that is your problem. Also you need the correct connectors where wires enter the panels, sticking the flex and the wire thru is not a good idea and makes for a messy installation.
 
Check out the wiring from watts247.com web site for split phase
s-l1600-3.jpg
 
You need to the AC input to be different phases of your AC panel. Each phase from your AC panel needs to feed a separate mpp unit. You said that your AC input is on the same circuit, I think that is your problem. Also you need the correct connectors where wires enter the panels, sticking the flex and the wire thru is not a good idea and makes for a messy installation
Check out the wiring from watts247.com web site for split phase
s-l1600-3.jpg
Thanks for the diagram. I also tried in parallel and the same issue occurs… as soon as I add a load, the gcfi is tripped. Both are setup as PAL the L/N/G are bound together respectively with the L wires connected to a single pole.

Right now had to go back to the inverters working NOT in parallel. Any more suggestions?
 
a few quick thoughts...

1) draw a clear picture of what you "think" you have, then compare it to what you do have...details matter so make sure the drawing includes everything
2)if you have another gfi breaker for your AC in, swap it to test that the issue is not a defective GFI.
3)you state that the problem is that your AC IN gfi is tripping with any load. If you have done step #2 above then the GFI is tripping due to an imbalance between your lines..current IS finding another return path to the source or to ground; disconnect your current loads and try something easier to debug such as a single simple load (the old favorite space heater type) and see what the system does. You want to find where the current leakage is happening.
4)use an ohm meter (everythiong disconnected of course) and check your cables to make sure none are touching something they should not (nick in insulation, wire strand touching something, etc.); this is also when you can verify your L/N bonding...
 
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