SunnyBoy @ 240 volts

[MikeXl426]

Hi

Might seem a dumb question, but is it likely the Sunny Boy inverters will be OK with an incoming AC voltage of 240volts, given the nominal AC voltage is 230volts??

And given that, what is the Nominal AC voltage range...(according to spec 220, 230, 240 V; 180 – 280 V)? Does it automatically modify its output voltage to match the incoming voltage?

Thanks

Mike

 

[TedM]

Grid voltage in the UK is 230V with a +10% -6% tolerance. So anything between 216V to 253V is possible within this range - and sometimes slightly out of this range too.

Grid tie inverters work by monitoring the grid voltage and modifying their output to a slightly higher value accordingly. This can cause problems if the grid voltage is right at the high end and can cause the inverter to trip out. DNOs are usually amenable to fixing this.

240V won't be a problem.

 

[SRE]

This is the problem we're having with a SB3800 the voltage was at 256 and has just been reduced to 249 today. Will we still need to alter the parameters and what about the house down the road which is due to be installed as soon as planning permission has been granted?

 

[seprim]

SRE
Interesting problem - perhaps voltage optimisation is the answer . .
I have emailed these guys to see if this product can be fitted in conjunction with energy generation
The vphase voltage optimisation product here --> What is voltage optimisation - VPhase
not sure if it would work with generation of energy, but wrt the tuning of voltage down it seems to do that as a feature.
Trouble is it costs £250 + VAT . .
regards
Andrew

 

[Worcester]

It does say on the installation instructions (in big bold type):

"The VX1 must NOT be connected to circuits containing embedded generation, e.g. solar PV or micro-CHP."

However, with more and more solar being installed, they might have to change that, even so it might still have to be 'downstream' of the SSEG unit.

 

[Pv dude]

SRE
Interesting problem - perhaps voltage optimisation is the answer . .
I have emailed these guys to see if this product can be fitted in conjunction with energy generation
The vphase voltage optimisation product here --> What is voltage optimisation - VPhase
not sure if it would work with generation of energy, but wrt the tuning of voltage down it seems to do that as a feature.
Trouble is it costs £250 + VAT . .
regards
Andrew

You cannot use the V phase for this as the inverter must under G83 switch of if the grid voltage exceeds 264v and of course the V phase reduces the grid voltage thus the inverter will never know if there is a grid over voltage.
You can down load the SMA software free from their site and run the design through this increasing the grid voltage to see when the inverter goes in to yield loss.

WE have had similar problems with the 3800 with certain manufacturers of modules where on very hot days the volt drop across the cells is increased by the heat and the systems can not produce the voltage to meet the requirements of the high grid voltage. We tend to specify the new HF range for the top end of G83.

Hope this helps a little

Cliff

 

[seprim]

It does say on the installation instructions (in big bold type):

"The VX1 must NOT be connected to circuits containing embedded generation, e.g. solar PV or micro-CHP."

However, with more and more solar being installed, they might have to change that, even so it might still have to be 'downstream' of the SSEG unit.

Thx Worcester - that answers that question :/

 

[aptsys]

However, with more and more solar being installed, they might have to change that, even so it might still have to be 'downstream' of the SSEG unit.

It would ALWAYS have to be downstream of any generation unit because it is essentially just a SMPSU.