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It also depends on the distance you need to cover, since R = ρ x L / A with: R the resistance of the cable Rho (ρ) the resistivity of the material (e.g. copper) L the length of the cable A the cross section of the conductor So if you have longer distances to cover, you need to increase the...

You're talking about a jelly roll consisting of anode/cathode material holding a charge, with a potential energy release of up to 1kWh per cell. You have to respect those things.

That's not what a semiconductor fuse is though. A semiconductor fuse is named as such because it's designed to protect electronic equipment (such as inverters). They're essentially really fast fuses, but don't contain electronics themselves.

Ah, ok. Mine is combined (heat exchanger at the top of the tank for domestic).

You need to do a calculation so you're not cycling the pump all the time. That said, with a variable frequency drive in these it tends not to be an issue. You can hook up both to the same tank. That's what I do: I have a 40kW wood gasifier coupled to a 3000L buffer. The heat pump sits on that...

From what you have posted and from what I see on the sceenshots, it just looks like a battery cycling and using all the energy. Maybe you can run a long time screen recording session to figure out your actual consumption, or use a kill-a-watt like device on the output of your inverter. Measure...

The BMS reporting state of charge likely needs a full cycle to 'learn' what is full and empty. LFP state of charge can not be determined by voltage, so you need to do Coulomb counting. It's impossible to know this with a new battery.

Some of those aren't on the European market (EG4 for example). Not in Europe.

And they've been used in industry for a long time already: https://heatpumpingtechnologies.org/annex58/wp-content/uploads/sites/70/2022/07/emersonhthpannex58templatesuppliertechnologyrev5.pdf But yeah, COP is limited. I personally don't really see the need of over-complicating these things...

For reference, this one is mine: https://www.orionairsales.co.uk/powerworld-pw030-dkzlrs-bs-easyplus-evi-air-heat-pump-cooling-r32-840kw-230v1ph50hz60hz-17183-p.asp Takes care of 120m^2 and all domestic hot water in spring/autumn, so your 8kW idea for your unit sounds ok, you can probably go...

Yeah, a house needs to be designed for this from the start. HRV has been standard here in Finland for decades, so I tend to forget that this is not the case in other places...

I just edited that in to my comment. You need an ERV/HRV system... But remember that it's not just the floor getting cold (just like low temp radiant floor heating is not about the floor getting warm). The floor also acts as a sink for IR radiation that would otherwise add heat to the room.

So, I have underfloor heating in winter which I use with a heat-pump (a monoblock) in summer for cooling. This works wonderfully where I am in my climate, where we maybe have a week (two at most) of cooling needs per year with temperatures at most reaching 30C for a few days max. The only thing...

That's for Home Assistant; that project you link to uses ESPHome (ESP32) to talk to the Deye. I don't use it myself, but from what I've read it's good.

The stress from that hanging wire on that fuse is not a good thing. Why not have it mounted to the surface in a fuse holder?

I use Grafana. I think you saw the set-up guide I linked to before in the wiki, and the code to talk to the BMS is on my github. For the Deye, you can use this library to read the data over modbus: https://pypi.org/project/sunsynk/ You likely will have to write a small python script with the...

Are you stuck in a time loop? ;) ... or is this the Matrix all over again.

A fuse like a Class-T can in some circumstances 'explode' in the sense that sand and bits of metal can come flying off in case of a short. They quench the arc very well, but in the process there might be some 'mechanical deformations' so to speak. The cover over the fuse holder keeps these bits...

Yes, absolutely. 25C is the sweet spot for LFP.

No, but the room is vented so that potential gasses released can not build up to the point of explosion.

Like most things in physics and chemistry (i.e., the real world) it's not a hard cut-off: it's a more gradual slope/process. You can still charge below 0, but very slowly. You can charge at 1C, but you shouldn't at the same rate you would at 25C. So why not play it safe, and disable charging...

First and foremost: make sure your cells always stay within voltage range (never below 2.5, never above 3.65) and below 40C temperature wise (and don't charge below, say, 5C). If any of those parameters are exceeded, the BMS has to cut off the pack or prevent charging/discharging depending on...

Don't confuse vent gasses and thermal runaway releases. The oxygen comes from the phosphate/cobalt bonds, not the electrolyte, in the case of thermal runaway. The electrolytes of both types release hydrogen gas as one of their major components, but more so with LFP electrolytes.

By definition a thermal runaway even has to release oxygen. The difference is at what temperature this starts to occurs: 125C for NCA, 210C for NMC, 270C for LFP if I remember all that correctly.

The main difference is thermal runaway. The Cobalt Oxide bond in NMC cells and the like is weaker than the Phosphate oxygen bond in LFP. So much so that, thermal runaway can occur with Cobalt based chemistries when there is a failure (e.g. overcharging), while this is not the case with LFP. It...

They will. Different ICC (International Chamber of Commerce).

Off topic, but I find it funny that it's called 'ICC' (International Code Council) and that it creates the IBC (International Building Code), when it only applies to the US.

You could start with the FAQ (and indeed the other pages) in the Wiki for example: https://diysolarforum.com/ewr-carta/special/pages

Personally, I use a lot of excess energy for food preservation. Not that I have to, but because I can: dehydrating/freeze-drying, canning, making broth/stock, etc. Of course, wood processing is a big one. Generating wood chips as well... I'll be looking into an electric sawmill at some point...

Plenty of information on these forums to get you started learning the new stuff!

This is a solar panel: It's based on the principle of the photo electric effect. A photon hits the P-N junction, which is essentially the place where two pieces of differently doped silicon meet. This interaction between the photon and the junction creates free electrons, which then transfer...

Don't. Part of DIY is to learn to make better systems. Can't learn without mistakes, and sometimes even catastrophic ones. You know the saying in engineering: 'Every safety rule and regulation is written in blood'. In this field, some of the rules have yet to be written, which is why it's...

One of the reasons I like the one BMS per pack is that I can put a failsafe in the BMS: if my max power draw is 6kW (the inverter limit), and I have 7 banks in parallel, that means I can put the BMS limit at 20A discharge per pack or so. Anything over that and the pack gets disconnected. The...

Just in case, run the calculations with a tool like this: https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html

Assuming LFP. If you put them at 50% state of charge, and cold, they can stay for quite a while. Why make it complicated. Short cycling LFP is not an issue. You could also just use a shunt and keep the battery between 20% and 80% or something. Personally, I don't bother: I built my place over...