What size circuit breaker or rcbo

[pirhead]

Just checking the regs for size of circuit breaker or rcbo to protect pv. the regs only says Type B as far as I can see:shades_smile:

 

[BruceB]

There is normally a recommendation in the inverter installation instructions.

 

[pirhead]

Just had a look through the paper work nothing immediately apparent it does say on the side of the invertor which is a Stecca 500, 5 Amp Max does that mean I can use 6 Amp RCBO:bow:

 

[malcolmsanford]

Isn't the size of the protection device governed by the load design of the installation.

 

[BruceB]

Just had a look through the paper work nothing immediately apparent it does say on the side of the invertor which is a Stecca 500, 5 Amp Max does that mean I can use 6 Amp RCBO:bow:

In terms of circuit breaker size that is fine by the look of it

Whether a rcbo is right is another issue. The inverter is transformerless, so unless the manufacturer makes the appropriate declaration then if you are including the residual current protection as part of ADS (ie TT or large Zs) then it must be a Type B rcd (712.411.3.2.1.1). The standard rcbo will not be. As long as you do not have buried cables you might be better off without a rcd/rcbo. I could not see anything in the datasheets about likely leakage.

Regards
Bruce

 

[pirhead]

Isn't the size of the protection device governed by the load design of the installation.

Thanks it is a 540w system on 230 volt supply. comes out at 2.34 Amps

 

[pirhead]

Much appreciated BruceB