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Illustrious Member
Joined: Jan 20, 2022
Last seen: Aug 13, 2025
Profile Activity
Topics: 16 / Replies: 2425
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Reply
RE: Off Grid PV to Immersion

Solar thermal panels are at least 80% efficient,whereas the max. possible efficiency from a (single sided) silicon PV panel is 23%. I have 30 vacuum...

12 months ago
Forum
Solar Thermal & Power Diverters
Reply
RE: Heat pump install overloads home fuse - 80A limitations

I've just addressed this issue here in the topic DIY solar upgrade. I've spoken with the senior NGED engineer who issues their operational specifica...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: DIY solar upgrade - Considering adding more panels

Yes, the meter is installed by your Energy Supplier, for which they have to meet Ofgem targets, but also benefit from a subsidy. Here's a diagram sh...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

I have attempted to address the subject of phase-imbalance by using analogies rather than referencing some of the excellent academic papers on the sub...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

I wonder if this diagram provides an idea of what happens when the demands on a substation are unbalanced across the 3 phases: I'm starting with the...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

Here's the classic 3-phase diagram of voltage against time, which will make better sense of Derek's explanations. I've just drawn this from scra...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

... which it doesn't, because the Neutral is rarely fused. Instead, the Neutral wire gets hot, which eventually creates thermal breakdown of the ins...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

Yes... and most of that will be down to ignorance. When I see an outage pop up on the NGED Regional alert page, I tend to check where it actually is...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

And you're very unlikely to! There are 230,000 ground-mounted local substation transformers and a further 320,000 pole-mounted. Only a few hundred...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

To underline those comments from @derek-m 19kW equates to 80A, which is the size of Service Fuse being deployed by DNOs when they get called to site f...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

I think both @david999 and @bretix are missing something which I've found an essential part of my route to understanding how this green technology pro...

12 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: DIY solar upgrade - Considering adding more panels

Yes, Canadian Solar is ok @david999 How do you feel about the short-circuit current of those panels being slightly greater than the 13.5A maximum ra...

12 months ago
Forum
Solar Photovoltaic (PV)
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