System Question

[Gavin A]

Yes I agree although in this case the only extra cost is £200 for the inverter and £20 for the isolator as 6 of the 18 panels are going on an outhouse in the garden so we would need the same length of cable same with fitting time etc... but I 100% agree with you if it was all on the same roof or one roof next to the other then it would be a waste of time, I would never have even suggested it to the client if that had been the case.... but as I said this post was about combining them together not to talk about weather using 1 or 2 would be a good idea as I understand that aspect (clearly I dont know everything as I wouldnt have posted here in the first place)


Thanks

fair enough, as I said, there are circumstances where 2 inverters are the best option, it just wasn't going to be on efficiency grounds (unless I suppose it's a fairly long cable run for the lower DC voltage 6 string system)

 

[Gavin A]

I just thought I'd add that I'd be very surprised if the two inverter option gets even close to the yield of the TL inverter.

I know Sunny Design gives an approximate yield but apparently it uses a very vague method for working this out - it is more of a configuration tool than a yield estimator.

The reason I doubt that the two inverters option will do as much as the TL option is that our results are all showing considerable improvement from our installs using the transformerless option.

I only use sunny design yield estimates for comparison purposes as well.