I'm doing some back of the envelope figures for an off the grid system, based on the government announcement that instead of the old 50% rebate for these systems to a recs multiplier - 5 x up to a 20kw system.
So for example (and remember figures are pretty rough!) and I'm using the same figures for the batteries etc, just altering the panel array size.
Say a 2.1 kw system (12 x 175 panels)
total system cost say $47500
roughly translated to:
panels $9000
batteries $25000
mmpt reg $1500
invertor $7000
installation $5000
230 recs, lets say $9200.
total cost $38300.
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say a 4.2 kw system (24 x 175 panels)
total system cost say $56500
roughly translated to:
panels $18000
batteries $25000
mmpt reg $1500
invertor $7000
installation $5000
460 recs, lets say $18400.
total cost $38300.
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say a 8.4 kw system (48 x 175 panels)
total system cost say $74500
roughly translated to:
panels $36000
batteries $25000
mmpt reg $1500
invertor $7000
installation $5000
920 recs, lets say $36800.
total cost $37700.
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ok - crazy scenario
say a 20 kw system (114 x 175 panels)
total system cost say $124000
roughly translated to:
panels $85500
batteries $25000
mmpt reg $1500
invertor $7000
installation $5000
2190 recs, lets say $87600.
total cost $36400.
Can you see where this is going or am i missing something, apart from an increase in the installation and regulator costs as the system increases in size, and whether a 10-20kw array can actually fit into this battery setup - or is it apparent to go as big as possible for no extra cost?