Advice Please???

[pete433]

We are installing 26 230W panels 5980 watts on a barn roof, the farm has a 3 phase supply and already has 3.75KW of solar installed on to one phase on a single phase inverter which is remote from this barn. Is it best for me to install another 2 x inverters for the new barn 1 x13 panel + 1x13 panel and then have a new three phase meter for my two new supplies obviously only utilising 2 phases.

This would mean leaving the 3.75KW on phase 1
3KW on phase 2
3kW on phase 3

but i would have 2 x generation meters.

i know it is a funny one any advice wouold be appreciated. cheers :bulb2:

 

[Worcester]

See this re the phases:

Q3 Can we get clarity as to exactly what the 16A per phase limit for G83 actually relates to? Is it based on:
a) the Declared Net Capacity or the Total Installed Capacity of the system (as given on the MCS commissioning certificate) ?
b) the manufacturers quoted peak output of the PV panels (or other applicable prime mover 'nameplate' figure) ?
c) the maximum grid-tie inverter output?
d) if it is based on the inverter output then is it based on the manufacturer's maximum rating for the model of inverter or based on the (sometimes programmable) actual maximum inverter output figure
e) figures used at a - d above are usually given in Watts - so, in order to convert to Amps, is 230V or 240V to be assumed? I believe the definition in G83 specifically states "230V ac" but many DNOs seem unaware of this minor fact.
f) can you confirm the maximum Watts applicable to a 3-phase supply?

(a) For Inverter systems it is the output of the inverter so it would be possible to install a 3.6kW inverter with 4kW peak of PV panels under G83
(b) No see answer above
(c) Yes see answer above
(d) maximum continues rating
(e) 230 volts is the nominal voltage for the whole of Europe
(f) 230x3x16= 11,040 for practicable purposes this is 11kW, split evenly over three phases. The following is not allowed
phase 1 4kW
phase 2 4kW
phase 3 3kW
as two phases exceed 16A per phase

Unbalance is allowable up to to the following limit
phase 1 3.7kW
phase 2 3.7kW
phase 3 any value under 3.7kW

There is no reason why you shouldn't have two seperate meters for the two new phases it'll be in the 4k-10k band anyway.

It may also push your existimg installation into the same 4k-10k band as well, depending exactly who is the 'owner' and where and how it is installed.

 

[pete433]

Thanks much appreciated.

peter