Questions about 16A output current of 4kw system

[LQY]

Hi guys,

Some of PV installators told me that they want 4KW inverters with the max out put of less than 16A/phase. But G83 defines that is the reuqirement to systems less than 3.7kw. For 4kw, the safty should be G59. Could anyone tell me why some installators hope to get 4KW under 16A?

Thanks in advance.

LQY

 

[screwdriver]

Because there are inverters on the market that will output up to 16A and voltages between 220 and 250 v so dependant on your local grid voltage you may be able to output 4kw without the inverter limiting the current eg 250v x 16 amps = 4000w, 230v x 16amps = 3680w

measure your grid voltage if you like and you can then work out what your local grid will let you output at max power.

I hope that makes sense!

 

[babba]

Some DNO will except 4kw mine does ..

 

[Glen Powell]

This may come under G83/2 rather than G83/1 ? may be worth looking up

 

[TedM]

The 16A limit for G83/1 is based on the inverter output - not the panel size.

(G83/2 is the next version of the standard which has not yet been issued, still in draft. Possibly you mean G83/1 stage 2. G83/2 should make it clear that the 16A figure is measured at 230V.)

 

[Glen Powell]

The 16A limit for G83/1 is based on the inverter output - not the panel size.

(G83/2 is the next version of the standard which has not yet been issued, still in draft. Possibly you mean G83/1 stage 2. G83/2 should make it clear that the 16A figure is measured at 230V.)

Yes sorry I did mean stage 2 been a long day

 

[SolarCity]

Are you a supplier?

The main plus point for inverters to be capped at 16A is that prior permission is not required from the DNO to install it. Prior permission from the DNO can take up to 6 weeks (although that is rare), and with deadlines popping up all over the place this is just impractical. By capping an inverter at 16A the installer can fit the inverter and notify the DNO afterwards.

 

[LQY]

Are you a supplier?

The main plus point for inverters to be capped at 16A is that prior permission is not required from the DNO to install it. Prior permission from the DNO can take up to 6 weeks (although that is rare), and with deadlines popping up all over the place this is just impractical. By capping an inverter at 16A the installer can fit the inverter and notify the DNO afterwards.

No, we are a producer of PV inverters. In Eco Build, many customers mentioned 16A issue. And we would like to solve it.
So can I understand in this way: DNO requires that if a pv system above 16A per phase should be pre-consulted to them first.And some installors want 4kw inverters with 16A because they do not want to pre-consult in DNO to save some time and probably some money? Am I right?

 

[LQY]

Because there are inverters on the market that will output up to 16A and voltages between 220 and 250 v so dependant on your local grid voltage you may be able to output 4kw without the inverter limiting the current eg 250v x 16 amps = 4000w, 230v x 16amps = 3680w

measure your grid voltage if you like and you can then work out what your local grid will let you output at max power.

I hope that makes sense!

Yes, I know that limitation. what I am concerning is that 4kw should be applied to G59 but not to G83 but now some installors hope this will be 16A as well.

 

[SolarCity]

It is more about time and keeping things simple. An installer likes to use 16A capped inverters as it means they can install 4kWp of panels and still keep within G83 restrictions.

What are the inverters that you make?

 

[LQY]

It is more about time and keeping things simple. An installer likes to use 16A capped inverters as it means they can install 4kWp of panels and still keep within G83 restrictions.

What are the inverters that you make?

Thanks, solarcity.
We are producing on-grid PV inverters with the brand "GoodWe". Our company is GoodWe Power Supply Technology Co., Ltd.

 

[Earthstore]

I have just had a good wee..
Sorry, I just could not resist that..

 

[Gary K]

I can just see the slogan-

"In GoodWe trust"

 

[Gary K]

I can just see the slogan-

"In GoodWe trust"

I'm going to register that as a TM- yours for a fee

 

[moggy1968]

is that a wee fee?