How much say do I have in a 7.5kw solar install...???
I'm experiencing some "interesting" sales approaches. With a solar company's salesman that came to the house, the final words about the system's panel makers and inverter brands were to be discussed with the "Engineering Dept." the following week. The salesman did say it would be a 7.5kw array, based on reviewing my year's electrical bills and it would be a Fronius (?sp) 8ks inverter. When asked if the inverter will handle a battery bank or generator he said "that's in the Engineering Dept."
Since that time, the company rep. sent me data for the panels and in discussion of battery/generator backup, he sent an inverter data sheet for "DELTA", instead of the Fronius. A few days ago, the vice president in charge operations called to set next as an install date. I told him I had not gotten all the information about the equipment nor the drawings for the project. So the next day, he and the first company rep called on a conference line. In the discussions, the VP said the inverter was now going to be a "SMA 7kw". I asked if that was of size rated for the 7.5kw panel array and he said yes the inverter is rated 25% over the output rating....
When asked about the Waaree panel brand, the VP said they are "Tier I" panels. When I asked about having other panel brands like "Panasonic and Kyocera", he said "They are not Tier I manufactures." "We will be using the Waaree panels on your system." as though I had no say in this install. I'm a bit put off with this voice tone and firmness. There are some other issues that were attempted to be changed. No trenching to the house, but attached to the workshop's 200 amp breaker box and 200amp disconnect unless the utility required the solar disconnect to be near their house meter base. Because "Engineering" had no site drawings, the fact the shop is on it's own meter, which I've said would be removed by the utility, he didn't understand the rest of the issue. Which means the 2nd meter I have is on the workshop due to it was cheaper to add a meter in 1994 than run heavy wire from the house to the shop. Their size wire between the workshop and the house being #6 for a 70ft.-90ft run between inverter and home meter base and solar disconnect is what they planned. It will not handle the power for the workshop, but entrance cable wiring would get power to the shop and also carry the inverter's power to the house at the same time. And I understood I would pay for the difference for the upgrade cost of the larger run between the shop and the house.
So, I'm asking for your input as to how much final input do I have on this $22,000 project? Is the SMA inverter sized correctly? Does it provide for a battery bank/home generator addition if I wanted to add one of those in the future. Is Delta a worthy brand? Are Waaree panels better because Panosonic and Kyocera "aren't Tier I panels"???
Thanks so much for your help,Bill
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