Hi, thanks for the opportunity to review, Firstly, a few quick points to consider before assessing these quotes:
We live in Eltham, Melbourne. With some small patches of shade at different times of day over the year, modeling shows this would have around a minus 3-5% affect on the system overall for where we’re looking at placing all the panels (West side of a tiled, gable roof), so 2 out of 3 Sellers have advised not to go for the micro-inverters due to the cost to savings ratio.
Currently: only 2 people at property. V low usage, averaging 4-5kw hours per day for both of us - we are aware a 1.5 KW system would be sufficient for this level of usage.
Future: Looking to add small living area in 2021 to rent to 2 extra people on same property. Also add solar water heating once our gas system kicks it. Both of us like the idea of future proofing, so we’re looking at both 3 and 4kw system arrangements.
3kw system quotes
9x 330W Trina Honey M + x9 Enphase iQ7 microinverters = Upfront cost $2969.00.
Total system cost $8113.38 (Seller A)
9x Longi 370W (LR4-60HPH-370M) + SMA 3kw (SB3000TL-21) = Upfront cost $591.25
Total system cost $5,915.25 (Seller B)
9x Sunpower 414W (SPR-P3-415-COM-1500) + SMA 3kw (SB3000TL-21) = Upfront cost $1,214.14
Total system cost $6,718.14 (Seller B)
12x Suntech 330W (STP330S-21/Wfhm) + SMA 3kw (SB3000TL-21) = Upfront cost $1,005.33
Total system cost $6,617.33 (Seller B)
10x Seaphim 330W + Solis 2.5kw = $2238 upfront cost
Don’t have total system cost from quote (Seller C)
4kw system quotes
11x Longi 370W (LR4-60HPH-370M) + SMA 4kw (SB4.0-1AV-41) = Upfront cost $1,610.38.
Total system cost $7,294.38 (Seller B)
14x Seaphim 330W + Solax 3.6kw = $2756 upfront cost
Don’t have total system cost from quote (Seller C)
I’ve also asked for Seller B to give me a quote of switching the 4kw SMA inverter to a 4kw Fronius but haven’t got this at time of writing. I think it adds an extra $100 or so.
Thanks in advance for the advice!