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Growatt 5kw backup system


Taps

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 Hi guys have a problem with an installation everything seems normal up until grid power comes on it cause the earth leakage to trip had an electrician come in to check the circuits that seems OK, but still experiencing power trips when  power comes in just after loading shedding 

 

Can anyone elaborate may be you encountered a similar problem 

 

Thanks in advance 

Edited by Taps
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1 hour ago, Taps said:

 Hi guys have problems with an installation every seems normal up until grid power comes on it cause the earth leakage to trip had an electrician come in to check the circuits that seems fine but still trip when until power comes in just after loading shedding 

 

Can an elaborate may be you encountered a similar problem 

 

Thanks in advance 

I had similar problem. you must connect the output of the inverter to the earth leakage. 

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  • 2 weeks later...
  • 2 weeks later...

Had the same. I used to have an 3kw Axpert on light circuits only but when the 5kw Growatt was installed in its place, earth leakage tripped all the time.

It cost me having to split the neutrals on the DB board so the circuits running on Eskom do not share a neutral with circuits running off inverter. Refer to the SANS diagram to do it right. It is expensive with the extra components needed, not to mention time, but important for safety.

Incidentally we found an un-earthed plug during testing afterwards. A proper hazard left by the previous house owner.

The temptation to install an inverter like a generator into the house wiring is big but not worth it. Rather make yourself an off-grid "power trolley" that plugs into the wall to charge and appliances plug into an extension cord from the trolley - until you can get a qualified person to rewire your DB and install permanently. Don't forget to put an earth leakage detector on the DIY power trolley too.

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On 2023/01/04 at 6:11 AM, Taps said:

 Hi guys have a problem with an installation everything seems normal up until grid power comes on it cause the earth leakage to trip had an electrician come in to check the circuits that seems OK, but still experiencing power trips when  power comes in just after loading shedding 

 

Can anyone elaborate may be you encountered a similar problem 

 

Thanks in advance 

if your earth leakage CB is before the inverter input, you will keep getting nuisance trips. Move it to the out put side on the inverter and all will be fixed. 😁

Edited by hoohloc
gramma
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38 minutes ago, hoohloc said:

if your earth leakage CB is before the inverter input, you will keep getting nuisance trips. Move it to the out put side on the inverter and all will be fixed. 😁

100% correct. Growatt has internal earth/neutral bonding, the output of the inverter must go to the earth leakage. 

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2 hours ago, Antonio de Sa said:

100% correct. Growatt has internal earth/neutral bonding, the output of the inverter must go to the earth leakage. 

This is a nasty 2 edged sword for me. I have in addition to the mandatory eld on the output, also one on the input. I have given thought to the idea of removing the inverter from the grid ELD,but i do get a trip on very very heavy rain weather. And that trip tells me something, that i am leaking earth on the roof assembly. Still need to investigate. So from that point of view i have decided to keep the inverter on the input eld. 

 

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Hi

I installed Growatt 3kW 48v two years back. Gridtied, trips eld when ESKOM power is linked. I measure 95V AC between earth and neutral, as the Growatt earth bonding relay closes a second or so after ESKOM power comes in.

As the unit is out of guarantee I stripped it after watching Youtube videos on the subject. I found two screws linking circuitry on the main pc board to the chassis. There are 6 mounting screws, 4 in corners, clear of circuits. I am sorely tempted to remove the earthed screws, they are little metric M3 machine screws, labelled SC2 M3 and SC3 M3 respectively.

So far I have had zero luck in my attempting to contact Growatt. The firm I purchased the inverter from died in Covid period.

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