Last seen: Sep 12, 2025
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...
Sure. No problem:
Latest Posts
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@drei Oh dear, so is this system brand new and still no...
By ASHP-BOBBA , 11 minutes ago
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RE: Is a Valliant Inline 6kW heater a BUS buster?
I think so but I don't know for certain. A cascade as ...
By JamesPa , 12 minutes ago
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RE: Humming sound on new install.
Sorry, I should also add these checks The ASHP must ...
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RE: Buffers, hot water and cooling
@dgclimatecontrol thanks, that's helpful.
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RE: Failing heat pump system - seeking thoughts on a rebuild
I realise im overdue an update on my situation. first...
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RE: Replacing Worcester oil boiler with an ASHP
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RE: What crazy nonsense are inverter limits and why are they imposed?
A week later, I'm finally picking up this comment... ...
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RE: COP is not the only measure of efficiency
We keep all our TRVs fully open using the whole house a...
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RE: Renewables & Heat Pumps in the News
To unpack this a little.... 1) how many of us in this...
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@realevil the fans and fan speed / coil size (height, w...
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RE: Mitsubishi Ecodan 11kw Defrosting Issue.
@morgan this can just be done by your sepecilist when t...
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RE: 300 Liter Tank - Do I have to heat it all?
The size of DHW tank affects the anti-legionella cycle....
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RE: Heat Pump SCOPs – The Truth Might Not Be What You Think
@scalextrix Name plate capacity
By HCas , 3 days ago
