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Home » Solar inverters » Solar photovoltaic system, what we can get?
Solar photovoltaic system, what we can get?
The goal of any good solar system is to lower or eliminate electric bills. Adding more products defeats this goal. I am not going to get into the AC/DC war. Just remember this one fact. With long line grids there is a 40% loss in power from the power plant to all their customers. We pay for that loss in what is called "Peak Power Periods." I feel instead of selling the public a limited solar net metering solution that cost now just around $6.50 a watt and this only gets the customer a 25% reduction in their electric bills. I feel that a customer should pay $4.80 a watt and eliminate the electric bill 100%. The biggest difference is cost. The lower the cost to the customer the more and more customers are going to switch. A good example of this is the cost of gas. Today I saw a gas station with a price of $4.12 a gallon and no customers. Then less than 1/2 mile away I saw gas lines at another station that is selling the same gas for $3.79 a gallon. The same holds true for solar systems. We need to keep the total equipment cost down so solar photovoltaic is more affordable.
Now for adding the cost of wire and the higher cost added to the total system using micro inverters. This type of thinking may be great if you are producing micro inverters. But again micro inverters add cost to the entire system. Is this really a good solution to promote and install solar photovoltaic systems? Total DC systems are not a good solution to change to 100% because of the added cost of a system. Homes and all businesses need polly phase. Micro inverters just can not do this function. Also micro inverters do not adjust to the electric loads of a home or business. I have seen so many installs of solar PV inverter systems that can not handle peaking of a electric motor. Yet all of our systems not only allow a home or business owner, "A no fault peaking of electric motors system".
So why should anyone want to spend more money of a solar photovoltaic system that does not really do the job of generating enough electric power to go off the grid completely. In order to store AC electric power you need a big wheel. This type of thinking is not practical nor affordable. Not so with DC power. All you need is batteries. Batteries can handle the peak power required to supply enough power to start motors. I feel I am right in saying solar Photovoltaic should be affordable for everyone. Argue all you want about DC verses AC. Just look around on our highways. You will find solar modules on poles powering something where the grid is not available. The main reason why these system exist is because of the high cost of wire. The same holds true for micro inverters. Why add extra hardware and wire when it is not required? I can go on and on about why micro inverters are limited. I don't want to hurt the industry at all. I just want to make you aware of how solar PV is sold and installed. Almost all polly phase inverters cost around 50 cents a watt not a $1.50 a watt for a micro inverter and the added wires to make it work. Its all about cost to the end-user. Sorry to use the price of gas as an example of cost. Also did you know that solar photovoltaic DC electric power can produce hydrogen gas. AC power can't.
Now for adding the cost of wire and the higher cost added to the total system using micro inverters. This type of thinking may be great if you are producing micro inverters. But again micro inverters add cost to the entire system. Is this really a good solution to promote and install solar photovoltaic systems? Total DC systems are not a good solution to change to 100% because of the added cost of a system. Homes and all businesses need polly phase. Micro inverters just can not do this function. Also micro inverters do not adjust to the electric loads of a home or business. I have seen so many installs of solar PV inverter systems that can not handle peaking of a electric motor. Yet all of our systems not only allow a home or business owner, "A no fault peaking of electric motors system".
So why should anyone want to spend more money of a solar photovoltaic system that does not really do the job of generating enough electric power to go off the grid completely. In order to store AC electric power you need a big wheel. This type of thinking is not practical nor affordable. Not so with DC power. All you need is batteries. Batteries can handle the peak power required to supply enough power to start motors. I feel I am right in saying solar Photovoltaic should be affordable for everyone. Argue all you want about DC verses AC. Just look around on our highways. You will find solar modules on poles powering something where the grid is not available. The main reason why these system exist is because of the high cost of wire. The same holds true for micro inverters. Why add extra hardware and wire when it is not required? I can go on and on about why micro inverters are limited. I don't want to hurt the industry at all. I just want to make you aware of how solar PV is sold and installed. Almost all polly phase inverters cost around 50 cents a watt not a $1.50 a watt for a micro inverter and the added wires to make it work. Its all about cost to the end-user. Sorry to use the price of gas as an example of cost. Also did you know that solar photovoltaic DC electric power can produce hydrogen gas. AC power can't.
You do, however, make a point that should be highlighted: Micro inverter of DC/AC is only for systems where the grid is already present or systems designed, primarily, for grid-tied operation. Now, for an off-grid system, if similar panel level MPPT optimization is desired then DC/DC optimizers should be installed between the panel and the system DC bus. In addition to maximizing the power output per panel such DC/DC converters would regulate the system DC-bus for charging of the storage batteries and supplying the loads.