Same issue with my garden office. Insulation sorted the winter but first proper heatwave I realised the south-facing roof was basically a radiator.
Fixed it with two things:
External solar...
Done similar for my garden office last year. Went 100W panel (£48 off Amazon), Victron SmartSolar 10A MPPT (£65), and a Fogstar 100Ah lithium — though that last bit blew the budget a fair bit 😅
If...
Been powering my garden office for about 8 months now on a pretty barebones system — 200W of Renogy panels, a 30A PWM controller (yeah I know, MPPT next time), and a single 100Ah Fogstar Drift...
WrongFuse96 | 203 posts | 🔧 Off-Grid Tinkerer
Not on a narrowboat myself — garden office build — but cable runs through confined spaces are cable runs through confined spaces and I feel that pain...
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