Solar Panel Grouping
| Answer pending
I am prepping to click approve on a plan for a solar system provided by Tesla & need help making sure it is the right solution for my needs…
Needs:
- Solar solution can run everything in the house without a priority breaker panel in the event of an power outage
- If a panel fails in a group the loss has a limited impact within the group/side & overall collection
- Uptime for at least a week (optimal sun)
- Less than 1.2 AC/DC Ratio
System Specs:
- House:
- Dual 220 Power Ins
- 2 Main Breaker Panels (1 ofr each: 220 / 110)
- Southern Panel Location: Zero Shade / Optimal for solar collection
- Solar:
- 2 Centralized / String Inverters (PowerWall+ built in solution)
- Dual MPPT (per Inverter)
- 41 Total Solar Panels (400W)
- 16.4kW / 25,631 kWh /yr (advertised) (real: 15.2kWh?)
- 54kWH Energy Storage System (4 PowerWalls)
- Side A: 110V Main: 20 Panels + 2 PowerWalls+
- Side B: 220V Main: 21 Panels + 2 PowerWalls+
Schematics:
Inverter 1 –> 110V Main (Side A)
- MPPT 1-1: 2×5 Solar Panel Group
- MPPT 1-1: 2×5 Solar Panel Group (not sure why they aren’t using the 2nd MPPT port)
Inverter 2 –> 220V Main (Side B)
- MPPT 1-1: 1×9 Solar Panel Group
- MPPT 1-2: 2×6 Solar Panel Group
Energy Collection:
- Both Inverters are capped at 7.6kWH
- SIDE A: (20 panels) = 8000W (400W clipped loss? at peak sun)
- 1.05 DC/AC Ratio (I think)
- SIDE B: (21 panels) = 8400W (800w clipped loss? at peak sun)
- 1.2 DC/AC Ratio (I think)
- SIDE A: (20 panels) = 8000W (400W clipped loss? at peak sun)
Hopefully I gave enough (& the right) details to gain feedback / commentary if my needs are going to be met. Also willing to receive feedback if there is anything else I should ask from Tesla before clicking approve. I’m not sure about the Side A single MPPT, but that is how I read the plan… Feels like they are trying to save on wire or cost cut the system. In my plan they say I have 4 MPPTs, but they are clearly only using 3. Tesla is adamant that is what is best for my situation for performance. I care about getting the most possible energy collection with least amount of clipping as possible & the most resilient solution (e.g. panel failure in a group) possible. Thanks in advance! All advice welcome.
