I have reviewed the proposals and can tell you the following:
The LG panels are a better quality panel than the Jinko. They will perform better in low light conditions and you will produce more power on and annual basis than with the Jinko.
The Enphase will produce more power than either of the string inverter systems. This is a fact and, one that has been demonstrated in at least three different studies done comparing Enphase to string inverters. We have done side by side roof top comparisons of the Enphase to string inverter production, and our results have equaled or bettered the results of the other studies.
the ability to add panels and micros to the Enphase system is very simple. We actually recommend, to our clients, a system that is at least 20% smaller than string inverter systems because, at that size, it will still produce the same level of power on average than the string inverter systems. So, if I was recommending a system for you based on the numbers you have provided I would suggest a 16 - 17 panel system using the Enphase IQ micro-inverters. This will - on average - produce the same level of power as the larger string inverter systems. This will substantially reduce the cost of the Enphase system, and even a 10% savings puts the system at about the same as the Fronius Australia system.
The Enphase system is expandable - the others are at maximum for the inverters.
If there is a problem with a panel or a micro-inverter in the future, it is easy to deal with and you do not lose the production of an entire system while the problem is dealt with.
There are many other reasons to go with Enphase over any other string or even other micro-inverters (if you would like more information on this, check out our web site - ecsolarmx.com ) Having installed many string inverter and worked on others including; Sunny Boy, Fronius, Kaco and Solis, we made the decision a number of years ago to exclusively install Enphase. We did so because, we felt that Enphase was the best product and, the best value for our clients - in the long run. As it turned out, when compared to high quality string inverter systems, from reputable solar companies, they are as economical or, in some cases, less expensive than the comparable string inverter system - based on average annual production.
In fact, we are so sure of the Enphase system’s greater production numbers that, we actually offer a five year annual production guarantee. If the system does not meet or exceed our annual production numbers (for the first 5 years) we will either refund a portion of the purchase price or, install additional panels and micro-inverters free of charge.
Bottom line for us is, that many people look at the upfront cost and believe that a solar system is a solar system. You need to dig deeper and when you do, we believe that the Enphase system will, in fact, be the better investment both up front and long term.
Hope this helps.
Tony at Emerald Coast Solar (Mexico)