LVX6048 / TP6048 overpaneling?

[42OhmsPA]

Am I overthinking this or just being dumb?

Currently have 2 9s strings connected in parallel via combiner box to my TP6048. Everything is working great except I'm not generating enough power. (it's sad watching generation going lower and lower each day, come on solstice ?).

I want to add a 3rd string, looking at the specs I should be fine but want some reassurance and/or motivation.

String 1 is facing slightly SW, around 15 degrees
String 2 is facing W, around 20 degrees
String 3 would face S, maybe slightly SE to catch the sun earlier, at a 35-40 degree angle.
1 and 2 are roof mounted, 3 would be ground.

Current panels are used 315w QCells
New used panels would be 280w-330w depending what I can find locally or Santan that is close to current specs.

Thoughts, feedback and wisdom?

 

[42OhmsPA]

I'm going with being dumb.
I'll add a 3rd string around the same VoC and amperage and report back if I get any magic smoke.

 

[42OhmsPA]

Think I found the 3rd string.
Anyone see issues if I add 9s jinko 295w in parallel with the existing qcell strings?

 

[42OhmsPA]

How about 10 260w Trina? 380 voc.
Current strings are 362 voc.
Trina are poly. Qcells are mono...
I'm kicking myself for not buy more of the qcells when I had the chance.

 

[iamrich]

I know this thread is a year old, but did you ever end up adding the third string? You have two arrays pointing in different directions? Doesn't that reduce the overall production because the single MPPT is trying to make the best out of both arrays?

 

[42OhmsPA]

I know this thread is a year old, but did you ever end up adding the third string? You have two arrays pointing in different directions? Doesn't that reduce the overall production because the single MPPT is trying to make the best out of both arrays?

I never did add the 3rd... I bought another inverter for more capacity.
I've seen no impacts to performance with the S and W arrays paralleled and I've seen over rated output numerous times.

I will be hooking the S and W arrays up to the separate mppts of the new inverter until I re-parallel them when I add my 3rd array (in process of building).
If I see a noticeable improvement in production I'll report back.

 

[iamrich]

I was just wondering because I have room for six strings of nine 325w panels on my roof (all facing the same direction, 210° SW, 27° angle), but I can't fit them all into my two LVX6048 single MPPTs. Kind of regretting not getting a AIO with more than one MPPT input.