Last seen: Sep 27, 2025
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...
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...
... which it doesn't, because the Neutral is rarely fused. Instead, the Neutral wire gets hot, which eventually creates thermal breakdown of the ins...
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...
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...
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...
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...
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...
@ bretix This is type of fuse-holder which attempts to double-up as a contact breaker. You pull the top handle towards you and the fuses get pulled...
I've just checked the PV-input specifications for your 3-phase 10kW inverter @bretix Like @david999 you have two MPPT inputs,but in your case ...
You may wonder why it is that your inverter is rated for a maximum 3600W output,and yet each of the two PV inputs can take up to 550v x 13.5A which co...
Or, if you'd like a more technical answer... PV panels that you're likely to consider for rooftops have three electrical parameters which we need to...
Latest Posts
-
RE: Seal the Deal: Don't Let Your Heat Pump Leak Energy
Indeed. If the primaries are not big enough to carry th...
By Old_Scientist , 27 minutes ago
-
RE: Samsung Gen 6 - Schedules not working
Sorry, not sure I can help. I only use Daily schedules ...
By Old_Scientist , 38 minutes ago
-
RE: DNO export limit problems.
How big is your proposed solar array? I have 7.2kWp a...
By Old_Scientist , 48 minutes ago
-
RE: Do I just go with the lowest quote for my heat pump?
@jancold Good afternoon. So I have had a conversation w...
By Terry1812 , 2 hours ago
-
@bontwoody 😟 You are a lot more patient (or cha...
By Toodles , 3 hours ago
-
RE: Clivet ASHPs and weather compensation
It sounds like weather comp may not be activated. Give ...
By Simon Wardle , 3 hours ago
-
RE: Say hello and introduce yourself
8kW is still less than an electric shower,but drawing t...
By Transparent , 3 hours ago
-
RE: Which thermostat should I get (or do I need one?)
OK I've thought some more about this. I think you have...
By JamesPa , 5 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
I just looked at mine. My flexis (which run horizontal...
By JamesPa , 6 hours ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
Manufacturer: Vaillant Model: Arotherm Plus 7kW Typ...
By MatWin , 16 hours ago
-
@papahuhu Sounds as though you need to speak to your in...
By Toodles , 23 hours ago
-
RE: Flexi-Orb Heat Pump Scheme: A Game-Changer for the UK's Heat Pump Industry
Signed.
By Morgan , 23 hours ago
-
I ‘did the math’ for Nov. to the end of April to be on ...
By Toodles , 24 hours ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
@tasos automations on Home Assistant so if there is a p...
By benson , 1 day ago
-
RE: Sizing - Save me from my headache
Mitsi 8kW has a 6kW variable and 2kW fixed compressor s...
By JamesPa , 2 days ago
-
@drei your proposed radiator design looks inadequate to...
By GrahamF , 2 days ago
-
RE: Why does an ASHP provide a more comfortable environment than a gas boiler?
Actually, I think the issue is the different rate of he...
By AndrewJ , 2 days ago
-
RE: 5 Star Service from Havenwise
That's why homes are spread across the three phases. ...
By Dan_Grey , 2 days ago
-
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face
@editor like @jamespa, I had a list of test questions: ...
By GrahamF , 2 days ago
