Electronics > Power/Renewable Energy/EV's

Paralleling solar panels

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uer166:
I know better not to do it, but I have 10 panels with Vout of 65V each. If i have one string, that is 650V, if two, then 325V. In either case, the price of a total of ~3kW of MPPT capacity is very high for whatever reason. The cheap MPPTs seem to top out at ~250V PV.


So, what are the downsides of paralleling say 5 (or 10) 325W panels, all in identical conditions/temperature, and no shading?

Jeroen3:
The input current of an MPPT is also limited. Typically around 15A.
Paralleling solar panels requires different strategies for power tracking and is uncommon.

I can buy a 3kw growatt with 360 Vdc nom input for less than 500 euro.
Three phase output inverters can typically handle higher dc inputs.

uer166:

--- Quote from: Jeroen3 on May 17, 2023, 07:20:16 am ---The input current of an MPPT is also limited. Typically around 15A.

--- End quote ---

In a non-isolated buck, the input current handling should be same as output, would it not be? All the ones I'm looking at are 40-60A output non-isolated buck MPPTs. 500 Euro is eye-watering for this application. You're right about the panels, it's a totally different optimization..

Jeroen3:
You are looking for a DC/DC application?

tautech:

--- Quote from: Jeroen3 on May 17, 2023, 07:20:16 am ---The input current of an MPPT is also limited. Typically around 15A.

--- End quote ---
Yet the Morningstar ones I remotely monitor are rated to 60A. Commonly see them from 2 and 3 panel arrays charging at 25A.
While double checking that online I notice they have a new 600V product also rated to 60A.
https://www.morningstarcorp.com/products/tristar-mppt-600v/

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