Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 5 replies
  • Subscribers 32 subscribers
  • Views 517 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Replacing a 4kW transformer based inverter for a PV system

LittlePlumb
Hi All,

Can anyone assist me please? We installed a 4kW two string PV array in 2011 utilising an inverter which had a transformer and hence galvanic isolation. The inverter has broken and needs replacing, however, inverters these days all seem to be transformerless. Does anyone know where I can purchase a transformer based inverter pls?

Pete
Parents
  • 0
    Hi LittlePlumb,

    Have just revised the DTI Guide 2nd Ed which was the guidance at the time; the logic is ultimately the same as now save that galvanic isolation was preferred to keep things simple.They were heavy though!

    Transformerless inverters are far easier to get hold of.nowadays, but since some module types do require galvanic isolation there are some products out there, though choices will be limited. If your manufacturer still exists I'd start by talking to them.

    There is also a market for second hand inverters; Navitron is one as well as Fleabay.

    Depending on your installation, making the necessary changes to accomodate TL inverters may not be insurmountable and I would recommend starting there... The best practice guidance re frame bonding has changed for galvanically isolated transformers too anyway.

    Technically you could consider a separate isolation transformer but I suspect that'd be a pricy option and would affect efficiency.

    Jam

    PS - Do note that if you are replacing the inverter with a more modern unit it's likely you'll have to notify the DNO per G83/G98 as the grid parameters will have changed, plus it's a different SSEG
Reply
  • 0
    Hi LittlePlumb,

    Have just revised the DTI Guide 2nd Ed which was the guidance at the time; the logic is ultimately the same as now save that galvanic isolation was preferred to keep things simple.They were heavy though!

    Transformerless inverters are far easier to get hold of.nowadays, but since some module types do require galvanic isolation there are some products out there, though choices will be limited. If your manufacturer still exists I'd start by talking to them.

    There is also a market for second hand inverters; Navitron is one as well as Fleabay.

    Depending on your installation, making the necessary changes to accomodate TL inverters may not be insurmountable and I would recommend starting there... The best practice guidance re frame bonding has changed for galvanically isolated transformers too anyway.

    Technically you could consider a separate isolation transformer but I suspect that'd be a pricy option and would affect efficiency.

    Jam

    PS - Do note that if you are replacing the inverter with a more modern unit it's likely you'll have to notify the DNO per G83/G98 as the grid parameters will have changed, plus it's a different SSEG
Children
No Data

Community Rules & Guidelines