Most string inverters have 2 of these MPPTs, so if there is shade on an east facing panel in the morning it can be totally isolated from the panels facing north that are in full sun. If there is shade on one or two panels then it does its best to keep the power on that string as high as possible. These MPPTs are continually working throughout the day to strike a balance between voltage and current to maximise the amount of power produced. Standard string inverters minimise the impact of shade by having two Maximum Power Point Trackers (MPPTs) in the inverter. This isolates the effect of the shade to a small part of the panel but unfortunately, in standard solar setups, there is a flow-on effect to the rest of the panels in the system that reduces the overall performance of your solar system beyond just the effect of the shade on one panel. The junction box holds several bypass diodes which turns parts of the panel off if they are affected by shade.
This is probably worthy of a blog post itself, but we will try and break down in simple terms what MLPE does for you and how this differs from your typical string inverter setups.Ī typical solar panel contains a group of cells (60 or 120) connected in strings to a junction box mounted at the back of the panel. SolarEdge is a little different to the rest in that uses Module Level Power Electronics (MLPE) to optimise the production of your Solar PV system. This is particularly evident in the areas of flexibility, R&D, safety and support. No manufacturer gets a perfect score, but the best ones get very close and SolarEdge is certainly one manufacturer that does this. Price (note this one comes last for us).Commitment to research and development – how progressive is the manufacturer and are they investing heavily in innovation.Financial stability of the manufacturer.the ability to add a battery or connect a hot water system later
Reliability, longevity and quality – these all sort of go together.While support is the number one factor we consider, there are lots of other things we assess when choosing what products to offer our customers (in order of importance): That’s one of the reasons we give a positive SolarEdge review. Their support is one of the reasons we keep supplying their products to our valuable customers and we know, that no matter what the issue, SolarEdge strives to resolve problems promptly and efficiently. SolarEdge, hands down, are one of the better companies we have dealt with. However, the most notable aspect is how well the manufacturer supported us when something went wrong. We have had good and bad experiences with nearly all the major inverter brands at some point in that 10 years. Measuring reliability is a highly subjective undertaking and its nearly impossible to get accurate numbers out of manufacturers – they all say their failure rate is less than 1%! Industry veterans also have vastly differing views about what makes a good, reliable inverter and it amazes us how the fantastic experience of one installer can be equalled by the horrible experience of another. Under the hood however it’s a very different story, and we know from experience that inverters have vastly different build qualities, leading to variable reliability and performance between brands. If you took the logo off the top of the spec sheet and sat them side by side you’d be hard pushed to tell the inverters apart. These days your standard string inverters are nearly identical in terms of the claimed feature set. Some could be installed outside, some couldn’t conversion efficiencies ranged from 92% to 97% and most inverters had a transformer in them and were quite heavy to lift – how times have changed! When we first started supplying and installing solar 10 years ago, the differences between inverters were quite substantial.
Having installed over 45 MWp (5,500 systems) of the stuff over 6 years, we thought it would be good to put our experiences and thoughts down on paper and provide you with a SolarEdge review.
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