100w panels for sbms120 and dmppt450

[jim]

I'm considering adding some panels to my 2.5kw system. I don't think there is a huge downside to adding 100w panels other than needing more cabling/adapters, but wanted to double check. These 100w panels are much cheaper than they used to be, seem to use newer 10bb cell tech, and would be a lot more flexible in my current situation. I can get them under $50 with tax and shipping included, easily add a few more later, etc. and should be able to get the 30% tax incentive since they are new. Finding local large panels at a decent price has been a challenge, freight is getting expensive. Most newer panels are getting really big and heavy and don't exactly fit the profile for the sbms120. I'd maybe prefer bifacials but they are still too much of a premium.

It feels like I should be able to run two in series to get something very similar to a 60 cell panel I'm already using, at around 200w and around 36v. I don't foresee major issues when hooking these up to my dmppt450 or even a sbms0+dssr50 at some point.

These seem pretty small, but just around the right area for a 22% efficient cell. The under 5kg weight and size means I could mount some more vertically in the winter, or even hide some on my flat roof garage.

Are there legit disadvantages to 9bb or 10bb cells that I haven't read about vs older panels? I assume maybe this has a thinner panel of glass and thinner aluminum that my more "industrial" 60 cell panels. It seems to me I can mount these 100w panels in a less expensive manner.

[Dacian Todea (electrodacus)]

The DMPPT450 was specifically designed for 60 cell panels but the SBMS120 and SBMS0/DSSR50 have no problem with what looks to be 34 cell panels connected as groups of two in series.

The DSSR50 should be able to handle up to 16 of this panels 8 on each input connected as groups of two in series and 4 of this groups in parallel on each input.

 

But those panels look to small to be 100W

They are 36.6" x 16.6" that is 93cm x 42cm = 0.39m^2

That will be about 70W if they where super efficient 18.1% panels so super unlikely they are even 80W. In photo they sort of look like 9 buss bars but not very relevant.

Here is a 100W panel made with 9 buss bars cells https://www.amazon.ca/Renogy-Monocrystalline-Solar-Compact-Design/dp/B07GF5JY35/ref=asc_df_B07GF5JY35 claimed 22% efficient cells about 18% efficient panel.

Size is 41.8" x 20.9" that is 106cm x 53cm = 0.56m^2 that will be exactly 101W at 18.1% claimed efficiency