Peak output

[wstevew]

Sorry was back at work.

I initially thought about 10m. But probably about 14 to 15m

 

[Earthstore]

Dansk was right, the technical man needs to get more technical, you need a minimum of 4mm but most would use 6mm cable for this length.
Looks like you may have more disruption, get them to change it.

 

[wstevew]

Thanks Earthstore & Dansk.

He said all their systems they have used 2.5mm and some they have had SMA out to replace inverters and they hadn't made any comments about the cable.

 

[wstevew]

Just followed along the cable run and I would say 13m from isolator to Gen meter.

Is there an online calculator for this?

 

[wstevew]

Probably opening another can of worms here but due to recent posts about inverters being mounted on fire retardent boards.


pv electrical pictures by wstevew - Photobucket

 

[methley]

One of those days today where the clouds go and you see a peak, But highest I have seen on mine 3.840kWp east/west system SB4000TL

I'll see your 4.35kW from a 3.84kWp system and raise you 4.38kW from a 3.76kWp system!

 

[wstevew]

I'll see your 4.35kW from a 3.84kWp system and raise you 4.38kW from a 3.76kWp system!

Well done but mine is facing the wrong way also

 

[methley]

Well mine's facing in three directions, two of then "wrong" so right back at yer! ;-)

 

[wstevew]

Who moved the sun then!

 

[wstevew]

If I can get technical, then why cant the technical man


[TABLE="class: data, width: 795"]
[TR]
[TD="bgcolor: #DCDCDC"]Allowable Voltage Drop[/TD]
[TD="bgcolor: #DCDCDC"]1 %[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCDCDC"]Run Length[/TD]
[TD="bgcolor: #DCDCDC"]14 m[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCDCDC"]Current Demand[/TD]
[TD="bgcolor: #DCDCDC"]16 A[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCDCDC"]System Voltage[/TD]
[TD="bgcolor: #DCDCDC"]240 V[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCDCDC"]Voltage Drop[/TD]
[TD="bgcolor: #DCDCDC"]10.71 mV/A.m[/TD]
[/TR]
[TR]
[TD="bgcolor: #DCDCDC"]Recommended Cable Size[/TD]
[TD="bgcolor: #DCDCDC"]6 mm[SUP]2[/SUP][/TD]
[/TR]
[/TABLE]

 

[wstevew]

As always you guys are spot on. A quick look through the manual shows up a Min AC cable size of 6mm up to 23m distance

Mounting instructions state "Do not mount the Sunny Boy on flammable construction materials". Does this mean a fire retardant board? Is it like plywood with plasterboard or something?

Also my RCCB is 30ma

 

[SolarCity]

You're already more clued up than their 'technical' expert.

They may have used 2.5mm on all of their other jobs - this doesn't make it right. It just means that they have done all of their other jobs incorrectly also.

 

[wstevew]

Sadly yes.

 

[Worcester]

Masterboard - we use it all the time - Masterboard

Any GOOD builders merchant will stock it or similar, it's not cheap, (£120 / sheet) though one sheet of 8 x 4 will do 4 jobs easily. (4 x 2 per inverter..)

It's stronger than pasterboard, tends to be water resistant also, doesn't have the paper finish.

 

[wstevew]

Thanks