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SOLAR ENERGY - Part 2.

String Inverters

  • If one module fails or is shaded, all are bottlenecked, Like a battery in a flashlight, a weak cell will limit the power through the whole string.
  • If a module fails, it has to be replaced with one with the same footprint and an electrical match.
  • Since a weak module is one of a string, troubleshooting is difficult.
    Voltage Window: 195 to 600VDC…now as high as 1000V. A high voltage DC arc is something to take very seriously.




"Dear wrenches-
I have a client who has a grid-tie system with about 40 Isofoton I-150S/24 modules. One of them has failed and he is looking for a replacement. Doesn't need to be the same, but something electrically compatible that he can put in the string will do. Anyone have anything he could use? Thanks.

senior system engineer and founder"

Micro Inverters & AC Modules

  • Each module has its own inverter so shading only blocks production from that module and they can face various directions…South being best
  • No work involving DC or high voltage
  • Each module has its own monitoring so trouble- shooting is very much easier
  • Arrays are expandable in steps of one module
  • Don’t have to find matching module replacements in case one is broken
  • All connectors are touch safe. All are plug and play so any homeowner who is reasonably comfortable on a roof can safely install them. You can also install them on a ground rack.
  • Add reliability as one module or inverter failure does not effect the whole array

Typical Array Locations


Anchoring Rails to the Roof

One of the usually unknown advantages for roof mounting a system is that, like having a big tree, it can cut your air conditioning by 30%. There is special hardware for any type of roof: asphalt shingle, metal, or tile. Rails can go horizontally or vertically. And Solar Modules can be either "portrait" or "landscape" in orientation.

Connecting Microinverters

No soldered connections, it’s all conventional 240 VAC wiring

Transition from Array to the Grid

Cabling may be different from one micro inverter to another, but the cable can be taken down the outside of the house or through a SolaDeck box into the attic.



Have your electrician wire in one of these. Solar arrays don’t attract lightening but they are on your roof:

Connecting to the Grid

Usually a normal 20 Amp 240V Breaker is backfed into your house’s main panel.

Westar, and probably the REC’s require a $30 blade disconnect where the PV cable enters the house. Check with them what their interconnect requires.

We highly encourage you to hire a licensed electrician to connect the array to your main panel. It is simple wiring and usually won’t cost much. And you Tax Credit also covers labor.