I want to design and install a 12kW system at my parents' place; the solar panels would be on the ground as there is a field with plenty of space and also to avoid having to work on a roof (which is also not too big and has a chimney).
I worked out a 12kW system with 15kWh storage to be the quickest to pay for itself. It needs to be an off-grid system with grid connection; the demand is never going to be more than 6kW.
I am looking at a Longi 555W that a seller on Alibaba proposed while I was asking for ground mounting systems
The inverter will need to be close to the house rather than close to the panels (so I don't have to leave the battery outside). I understand the way to minimise power losses on the 100m run is to use a high voltage setup.
If I have 22 of these panels in series I get 1100V and max 13A; is this too high a voltage for an inverter? I could use 4mm2 cables and only have 1% voltage drop.
If I have two arrays of 11 connected in parallel I have them at 550V, 26A max current, but to have the same 1% voltage drop I would need 16mm2 cables.
Or I could have two sets of 11 panels in series connected to two different PV inputs on the inverter (but 4 cables in total)?
What's the best practice?
I worked out a 12kW system with 15kWh storage to be the quickest to pay for itself. It needs to be an off-grid system with grid connection; the demand is never going to be more than 6kW.
I am looking at a Longi 555W that a seller on Alibaba proposed while I was asking for ground mounting systems
Device | Solar Panel |
Type | Monocrystalline |
Power | 555W |
Input Voltage | 42.10V |
Output Current | 13.19A |
Size | 2256x1133x35mm |
Weight | 27.2kg |
Open Circuit Voltage | 49.95V |
Short Circuit Current | 14.04A |
The inverter will need to be close to the house rather than close to the panels (so I don't have to leave the battery outside). I understand the way to minimise power losses on the 100m run is to use a high voltage setup.
If I have 22 of these panels in series I get 1100V and max 13A; is this too high a voltage for an inverter? I could use 4mm2 cables and only have 1% voltage drop.
If I have two arrays of 11 connected in parallel I have them at 550V, 26A max current, but to have the same 1% voltage drop I would need 16mm2 cables.
Or I could have two sets of 11 panels in series connected to two different PV inputs on the inverter (but 4 cables in total)?
What's the best practice?