Had the exact same issue with mine last summer. Turned out it was thermal shutdown — the unit was mounted inside a plastic storage box with zero airflow.
@OakSoul the £18 ones are basically a lottery aren't they. I ran one for about 8 months on my garden office setup before it started misreporting battery voltage — showing 13.8v when my Victron BMV...
Yeah, standing charges are the silent killer aren't they. Even on months where my garden office solar setup covers pretty much everything, the bill still shows £20-25 just in standing charges...
Had the same with my setup charging the garden office batteries on longer runs. Worth checking your cable sizing first — voltage drop on the input side will throttle the output before anything...
Not a narrowboat myself — garden office setup here — but the Victron + Fogstar combo is exactly what I run and it's been rock solid.
One thing worth flagging for narrowboat specifically: keep an...
BerlingoSolar | 312 posts
Yeah the rating labels on those cheap ones are basically fiction. Had a pair in my garden office build rated at "150A" that got noticeably warm at maybe 40A...
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