Grid Tied Solar


Grid-Direct PV

A grid-connected PV system consists of PV modules, output cables, a module mounting structure, AC and DC disconnect switches,inverter(s), grounding equipment, and a metering system, as shown in the diagram below. The Grid-Tie System Worksheet is designed to help contractors size a PV array to offset all of their client’s electrical usage with the largest system that would be cost-effective to install. A smaller system can reduce part of the electric bill, and in locations with tiered or progressive rates, it may have a faster financial payback. Compare the worksheet result with the amount of space available to mount the PV array in order to get a rough idea of the maximum PV array size.

Below is a diagram of a typical batteryless grid-tie system (utility intertie). Many grid-tie inverters have built-in DC disconnect switches, while some have both a DC and an AC disconnect. Some models also contain a PV array string combiner so a separate one may not be necessary. Separate overcurrent protection for each series string of modules in a PV array (typically provided in the array combiner box) is required only if there are three or more series strings of modules connected to a single inverter input. Inverters with multiple MPPT input channels can have one or two series strings per channel without individual string fusing.


Source: AEE Express

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7 Responses to Grid Tied Solar

  1. Destry Daniels says:

    is a grid tie inverter different from the 3000 watt power inverter i am using on my off grid system

    • crystal says:

      Destry, yes. The 3000 watt power inverter you use is only for DC to AC use where you plug AC appliances into the unit. A grid tie inverter converts the DC power to wire directly into the grid. This is also the method people use for net metering. The Outback system will allow you to charge batteries and feed into the grid so you get the best of both worlds.

  2. Myrick den Hartog says:

    I have been a licensed electrician for 48 years and currently live in a small town in Missouri with no local codes, inspectors or license required. I have installed 12 solar panels, have an inverter and lightning arrestor to hook them up; grid-tie. I can hook this up to conform to the NEC without the PE stamp on my layout.
    BUT, KCPL says that I have to submit a drawing of the proposed installation with a PE stamp in it before they will talk about it.
    They want me to have “their boy” do the install and charge me over twice what all the equipment cost just to give me the piece of paper with a stamp.
    I am going to do this myself. so how do I deal with the bureaucracy?

    • Ron Pokrak says:

      Look for another PE… I have lots working for me in the Mi/Oh area… It typically costs $250 per page max for them to check the engineering and stamp the print… We are allowed as home owners to do all installs on our own properties as long as they meet code and are not for rent… But my guys are not licensed in Missouri. Keep looking…

    • David A Blackburn says:

      Why even inform them what you are installing? Your system is before their connection and you have the correct interruption devices to prevent back feed into the grid when power outages occur. They have no right to access or inspect anything after the meter. Out of sight out of mind.

  3. Pedro J. Valet says:

    That is the main reason solar systems still a no… many cities.

  4. Doug says:

    we have package Hydro unit that generates 48v AC. 3 phase 4KW per hr. 90 amp. unit is rated 4.5KW and consumes 200 w. Looking for Inverter charger with 3 phase AC input and single or 3 phase output 208/240v. that could be grid tied. We have used 100a. bridge rectifiers to get DC but efficiency loss. Future units will go up to 15KW output 24/7 consuming 400w.

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