Solis Inverter 2 roof sides max, Huawei 3 roof "oversize" - True??

podgeandrodge

Have main east/west roof and a small south/north facing roof.

Solis installer telling me east/west only, can't do more panels on the small south roof.

Huawei installer confirming limitation of Solis, but that Huawei inverter allows for "oversizing" and can use 3 roof surfaces.

Any truth in all this or am I being bluffed?

Thanks.

conor_mc

waiting on my install, but putting two orientations on one string with optimisers, and a third orientation on the second string of a solis inverter.

graememk

To my knowledge

To oversize on Huawei, they want optimisers on everything.

Once you have optimisers you can do anything you want!

podgeandrodge

@graememk @conor_mc

Thanks. Just to clarify, so you can have 3 roofs with the Solis too? So I'm being given false info by the Huawei installer?

graememk

https://www.boards.ie/discussion/comment/122086937#Comment_122086937

Yes, the Huawei installer is stretching the truth. If you put optimisers on the solis it would also work fine with the mixed aspect.

But on the solis installer, may have a point in sticking with just the E/W, much simpler install, less points of failure etc

How many panels are we talking about on the south roof?

And what sort of difference in cost between the two?

podgeandrodge

@graememk

Was looking for 12 panels 6 east/6 west but an installer that came out said probably only 10 would fit. Huawei guy said if so probably get another 4 on the small south facing flatter roof to rear.

But I'm not obsessing about maxing panels to the point of having cabling all over the place either.

Not at point of getting cost of extra south panels. Seems like too complicated anyway as south roof is small with no access.

conor_mc

Access isn’t a huge issue, panels go up, forget about them for 25 years more or less.

4x panels facing south is a decent array too, 2000+ kWh per annum. I’d nearly drop 5x east for that, assuming you’re going battery plus EV tariff to cover early morning consumption. South + West will keep topping up your battery throughout the day then.

rgfuller

As others have said - it's easily doable with optimisers -

I have 7.12kW installed via 21 panels all on a 6kWh Solis -

South roof: 3.45kW (10 panels 1 string)

2nd string for East roof: 2.41kW (7 panels) and West roof: 1.38kW (4 panels). E&W all panels have Optimisers.

...Ghost...

Is there any reason why the installer can't do Solis on E/W roofs and then do a micro inverter setup for the South panels? This would reduce the need to have optimisers on 2 roofs, no? Not as straight forward as keeping it all on the one inverter, but in my head at least, it makes more sense.

unkel

Optimizers cost almost as much as PV panels, which makes your payback period longer. They are on your high roof, chances are that if you have 10 of them that every few years one will fail. Personally I would go with the simpler and cheaper E/W setup and no optimizers.