JoseJuarez wrote:One of the salesmen told me that his inverter has two MPPT's. .
Two MPPT's is GOOD, as it does give versatility.
MPPT is the internal device that converts the Solar-Power to a current to be used to make the Grid-Power.
It optimises the available Sun-Power to give the absolute MAX Electric-Power.
From my experience, it's important to load an inverter to just under it's MAX voltage..
If you look at the efficiency curves for each GCI, you will see that the highest efficiency (ie Grid-Power for given sun-brightness) will happen when the MAX number of panels (Voltage), are connected, and are just under the MAX voltage that the GCI will tolerate..
eg. with my inverter, it's suitable for 2000W, and 12 by 170W panels.. BUT 12 panels in one string exceeds the voltage where DAMAGE happens in the GCI. So, to protect the INVERTER, they should be connected as 2 strings of 6 each..
From practical tests I found that I only produced a few watts less, by using 11 panels, than 6+6, saving the cost of one panel.. This is just demonstrating the reality that it's more efficent at 11 panels than 6(+6).
Two MPPT's means that you can split your panels up. This can be VERY important, if your real-estate requires (say) panels on the EAST roof and the WEST roof.. .. If you must split the panels, then DUAL MPPT is imperative..
So - Bottom line - What are they suggesting for panel installation.. If they are talking about splitting, then DUAL MPPT is a sound way to go..
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