Ditching gas, going electric immersion only, a wee project

Heedtheadvice

It should be noted that the fuse holder is often labelled 100A as that is it's capability. The actual fuse historically could often be 60A .....so the actual rating needs fuse inspection.

Many safety devices do not trip instantly but can be very fast, quick or slow/ time delay and are designed to match the safety need. It is not however good practice to design to run with currents greater than the rating as that defeats the purpose does it not?

michaels

WE were uprated to 100A when we got our V2G charger.  This 80A business worries me to be honest, given the suppose direction of travel with heat pumps and electric cars and people wanting domestic batteries, 80A is insufficient.

We often run a 6.6 car charger, 2.2 car charger, 6 V2G, 3 immersion, heat pump (rated 12kw output) that can probably go up to 5 and then the dishwasher (2?) and washing machine (another 2?) - so potentially 27kw or be it the dishwasher and washing machine won't draw high current for long.

Qyburn

Heedtheadvice said:

It should be noted that the fuse holder is often labelled 100A as that is it's capability. The actual fuse historically could often be 60A .....so the actual rating needs fuse inspection.

If that's referring to my post, 100A is rating of the fuse itself, as removed/refitted during one of the meter swaps.

Heedtheadvice

Qyburn said:

Heedtheadvice said:

It should be noted that the fuse holder is often labelled 100A as that is it's capability. The actual fuse historically could often be 60A .....so the actual rating needs fuse inspection.

If that's referring to my post, 100A is rating of the fuse itself, as removed/refitted during one of the meter swaps.

Not at all. Just a general comment for anyone reading the thread.

It would be very easy to see the label and make, to my mind, a reasonable layman's interpretation ( but incorrectly) that it was showing the fitted fuse rating!

I also agree with micheals that modern consumption trend means that we will be more frequently running at [property supply current]max or greater than fuse current rating..and hence another need to get the grid supply upgraded. One saving grace us that the house consumption should [ is assumed to] not run at max all the time and calculations have always relied upon an assumed diversification.

It would help in this respect if things like dishwashers and washing machines were not started at the same time. They draw high current levels intermittently particularly during their cycles at the early stages and especially for dishwashers latterly whilst drying. Staggered starting helps diversification.

Edits: main points within [] brackets for better clarification.

Solarchaser

Minor update, before installing the SunAmp uniq 9, id assumed my hot water consumption to be about 6kwh /day.
The SunAmp proved that to be incorrect, as the wife and 2 of my children have been in a situation where the water ran cold in the shower, as the SunAmp had emptied itself, turns out I should have checked the sizing, as a uniq9 is good for 3-4 people, and we have 5.
Silly error, I based getting one on the maximum height I could fit under the house, and figured with a 10.5Kwh box against my assumed 6kwh usage, id have decent margin.
Wrong!
I should have consulted SunAmp's own sizing which said id need a uniq 12. Never even thought about it.

So i considered plumbing in the second SunAmp as well, but i really dont have room for the second one, I need to sell it on.

Previously when using the tanks for heating and hot water, id plumbed the hot water first into the smaller tank as a preheat and then through the larger tank with the much larger internal coil as the main heat.

So I decided the best thing to do was to use the small tank once again as a preheat, but this time as a preheat to the SunAmp.
It's only been a couple of days, but so far, so good.

For the central heating, I finally got round to fitting the underfloor heating thermostatic valve instead of the hot water one, and now the radiators are significantly warmer and the house so far seems to be heating up more quickly, so hopefully this winter will be a warmer house winter.

michaels

WE do 5 showers morning and 4 at night, takes about 22 kwh

debitcardmayhem

Simples, you go last 🤣

Solarchaser said:

Minor update, before installing the SunAmp uniq 9, id assumed my hot water consumption to be about 6kwh /day.
The SunAmp proved that to be incorrect, as the wife and 2 of my children have been in a situation where the water ran cold in the shower, as the SunAmp had emptied itself, turns out I should have checked the sizing, as a uniq9 is good for 3-4 people, and we have 5.
Silly error, I based getting one on the maximum height I could fit under the house, and figured with a 10.5Kwh box against my assumed 6kwh usage, id have decent margin.
Wrong!
I should have consulted SunAmp's own sizing which said id need a uniq 12. Never even thought about it…..snipped

Heedtheadvice

"... as the wife .......... been in a situation where the water ran cold in the shower" I know the resulting situation as I miss set the timer recently. I could feel the cold stare through the wall ....

Sounds your latest moves are good ones.....

Solarchaser

Yeah the wife wasn't best pleased 🫣

But instead of charging the SunAmp 9-12Kwh each night, it's now charging about 3Kwh before saying its full, so happy with that