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Thanks for the detailed reply. I’ll try to get my head round the maths and have a look. The boat is very long so space isn’t an issue. ?

Producing 260w would be fine if it did that all the time. I forgot to mention I live in North Wales in the UK though, where full sun is a rarity. I see 20w way more than I see 260w, or even 160w. I’m already using an MPPT CC, an Epever 40a. I need to edit my original post to say I’m in the UK...

Yep. You’re right. I can’t see how to edit my original post to say that though. ?

??? In all seriousness, I have, but all those who’ve tried it say it sucks on a narrowboat.

Hi all, I currently have a small system on my narrowboat that I bought cheaply about 10 years ago. I recently moved aboard full time and quickly realised I need to upgrade. The current set-up is 3 x 80w unbranded panels and 4 x 110ah batteries. I’ve already upgraded the CC to a 40a Epever and I...