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 27 replies
  • Subscribers 32 subscribers
  • Views 4140 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Neutral and Earth voltage with battery storage

vantech

Hi,

I have a battery storage system which is grid tied. This has been G98 registered. The battery has a grid tie and a UPS backup circuit.

The system works as expected, however when in UPS backup mode, I have noticed something that I need to clarify.

When in normal grid tied mode, the following voltages are recorded on the UPS output: 

L-N = 230V 

L-E = 230V 

N-E = 0V 

When in UPS mode, the following: 

L-N = 230V

L-E = 130V

N-E = 130V 

The manufacturer confirmed that when in UPS mode, a N-E link is made automatically and disconnected automatically. I have contacted them but being in China, they are slow to respond.

What I noticed, is that if you switch off loads on the UPS output, the voltage between L&E slowly increases to around 200V. I haven’t as yet tested to see if the same is apparent with N&E. 

Any ideas? This is an inverter so I am unsure if this sort of reading/phenomenon is normal? 

Thanks. 

Parents
  • 0

    The manufacturer today confirmed the following: 

    A “N-E” bond is created on the UPS backup output when in backup mode. 

    Voltages of 130V between N-E and L-E are normal, due to capacitances in the UPS output.

    That doesn't make sense to me - any capacitive coupling between N and PE should be shunted out by the N-PE link (if it's correctly being applied).

       - Andy.

  • 0 in reply to AJJewsbury

    I thought that too

Reply Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines