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Thanks for all the responses. To add some more details, the shed is around 40 metres from the house. The current Solis unit is in the loft of the house. I don't have the exact details of the cable from the house to the shed, but from what I can tell, it's on a 13a fused spur from another house...

Many thanks for the comprehensive answer SeaGal. I think I need to go back to the drawing board here, as you say best option would be to use the secondary MPPT input, but it would be a lot of work to get cabling up to the loft of the house and probably require more scaffolding. I'd also be...

So what would I need for that? Is that where a hybrid inverter comes in?

Hi all, new here so apologies if this has already been answered, but struggling to find a definitive answer on this. I've recently had a solar installation at my house, with 5 x 390w panels and a Solis grid-tie inverter. I was originally supposed to get 7 panels, but the fitters could only get 5...