I'm putting together an equipment list for a 7320W (nominal DC) residential system. I'd like to use per-panel MPPT because there are some trees on the property. I'm looking for recommendations for the cheapest inverter/maximizer combo.

Panels: 24x305W panels from Canadian solar (CS6X-305P). $.84/W delivered

System A: SolarEdge - $3561

System B: Tigo + Delta inverter:

I haven't done a full efficiency and and reliability analysis and would appreciate feedback about those factors, esp. how to compute realistic efficiency projections between the two systems based on real data.

Furthermore, there may be additional hardware I have not considered. The Delta inverter was the best price in $/W that I could find, but maybe there are other deals out there. SolarEdge has a ~$100 P700 dual panel optimizer that I would prefer to use ($.066/W savings), but I believe it only works with the 3-phase system (I sent SE an email to confirm).

What do you all think of the numbers? Can you come up with a cheaper configuration that would work well for a shade-ridden roof?

Panels: 24x305W panels from Canadian solar (CS6X-305P). $.84/W delivered

System A: SolarEdge - $3561

- SolarEdge 7600W inverter (SE7600A-US-U): $1727
- 24x SolarEdge 400W maximizers (P400-2NM4ARM): $1684
- Shipping: $150
- Total inverter + maximizer cost: $3561 = $.486/W

System B: Tigo + Delta inverter:

- Delta 6600W (nomial AC) inverter. 7920W input: $1550
- 12x Tigo dual maximizers (2ES-75): $1068
- Tigo gateway (GTWY): $99
- Tigo Maximizer Management Unit (MMU): $299
- Shipping: $200
- Total inverter + maximizer cost: $3216 = $.44/W

I haven't done a full efficiency and and reliability analysis and would appreciate feedback about those factors, esp. how to compute realistic efficiency projections between the two systems based on real data.

Furthermore, there may be additional hardware I have not considered. The Delta inverter was the best price in $/W that I could find, but maybe there are other deals out there. SolarEdge has a ~$100 P700 dual panel optimizer that I would prefer to use ($.066/W savings), but I believe it only works with the 3-phase system (I sent SE an email to confirm).

What do you all think of the numbers? Can you come up with a cheaper configuration that would work well for a shade-ridden roof?

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