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Well you can discuss it and discuss if it is cost effective or not. Or you can shut the whole thing down by saying it isn't possible and no further discussion. Which is completely ridiculous since people are doing it already. For us, we are a family with a grid connected home. We are basically...

So nothing is ever possible? The sun never shines when you need heat? Of course, taking an electric 14kW heater on a 5kWp and 7kWh storage system isn't the best option, and it is going to empty the batteries fast. But, this is a forum, and we can discuss what is a good option. There will be...

Apart from everybody having its own experience: I think it is important to understand the difference between the lowest point of solar energy and the seasonal energy required for heating. We just had a couple of grey months in which I really needed other power than the sun to heat our home...

Wow a lot of negativity at the start of the thread. Why visit this forum then? (edit: I don't mean the topic starter obviously) It can all be built. I already have a (much smaller) house in Netherlands, that would do perfectly fine off grid in Portugal because of the sun. And of course it...

I cannot comment on your exact setup or issue, but in general, yes inverters can defenitely go in discharge mode when the actual system voltage exceeds the configured max battery voltage. I had similair behavior with Victron and the Multiplus settings. You force the top-off with your other...

Yes I thought about choosing a BMS at 200A on purpose. Of course 300A would allow you to continue full power boating on the remaining module. However, I think it is a nice indication that something is wrong if you pull full power and it only does it for 10 seconds and then disconnect and reset...

Thanks for all the replies. Up until now I have been working with mid to high level split units, just AC powered, from Daikin / Mitsubishi / Panasonic to get a very efficient and quite aircon for heating and a bit of cooling. So I pick the ones that are reasonably efficient for heating. But I...

@shavermcspud and Why continuing with this black and white discussion about summer versus winter? It is not helping to answer the OP. I have a 5kWp system with 10kWh, grid connected. And they are only at 8 degrees tilt, so pretty much flat. Yes, the month of the shortest daylight, solar...

Here in the Netherlands we are still lucky in that, for normal amounts, you still get the same amount of money back per kWh as you pay. However, this system will eventually go down, I am sure of it. Still, if you significantly over dimensioned your solar system, in most places it should be...

Of course the battery is long sold :) Maybe when I have more time next time, I will go ahead and do it. And park it at a safe distance of everything else.

Basically, an important design choice (or in fact realization) is to decide if you are going to electrify everything, including heating and driving your car. If you do that, you could complain that there is a point that you don't produce enough solar anymore, whereas you could be "offgrid"...

Are there any numbers as to how much it increases output versus fixed solar panels that ar almost flat or something like a 40 degrees angle?

Ah yes I wouldn't call that a tracker at all. But I get the idea, building an array for a more constant power output throughout the day.

In the meantime I found out that you can boot these blue inverters with the top two buttons held, you get into a firmware menu. In that menu, you can let it be anything (1000W or 2000W version, sun or wind). Of course some of these won't work because of different physical connections. But more...

Well done! I like the creativity! I also had ideas to drive brushless motors from solar directly for a while, and now I come accross this, very nice. I guess I should start building stuff too.

Yes, lets find all the right circumstances to not make this work. Boy, can you think anymore in problems than in solutions? I don't know what everybody here is wining about "spending other peoples money" I just suggested a way to use excess power in winter more effectively, in a way that even...

Yeah in general I think so too. Just to be clear, when I mentioned AC in the above post, I meant alternating current. I am not discussing air conditioning. But I am expecting to cause some peaks and surges when cutting AC or DC. Maybe, when cutting the AC side, those peaks or surges don't reach...

When it is winter I don't want to pull in cold air from outside. And when it is summer I don't want the heat of a gas stove. Especially not in Portugal, in a well insulated home. In fact in summers in Netherlands I already had occasions where the house heats up more than I wanted when I still...

@RCinFLA For now the goal is to use "off the shelf" 48v DC mini-splits. I say "off the shelf" because I need to import them, I haven't seen them in Europe. The 350v route is something that needs more of my attention, studying new NPR 9090 standard, that describes how to setup that up. What...

The house is pretty new and it is not even finished. In purely renewables, I was thinking of making the battery bigger (up to 100kWh) and placing a windmill (there is lots of wind in the winter) as well as a recycle shower. That way it will become even less, below 500kWh. I could add a...

Ah sorry, you are right. That was perhaps not clear. The goal is to automate it. Based on hourly pricing or grid operator incentive. Thats why I mentioned the repeated times. So, whenever that is possible through software (hence the SolarEdge example) then that is the way to do it. But, a more...

In recent years some DC mini-split airconditioners have come to the market. At least in China and US, here in Europe I would need to import them. And they might not comply to everything needed here, but let's leave that out of the discussion for now. There are the hybrid types, and there are...

Hi all, I built a lot of systems already with the usual charge controllers and inverters etc, but this time a tiny project with a tiny solar panel. Some LiFePo4 cells, probably at 12v/4s max 20Ah and a 20 to 30W solar panel so very low C rate. Perhaps I will use 2 of these 20W trickle charge...

Half an hour heats up my living room, and that with less than 1500W. Sure, an electric heater is easier to control. And cheaper to buy. But I doubt if it really is cheaper. With 1000 kWh you can generate roughly 5000kWh of heat, making huge savings on the gas bill. And if you don't have...

Ev or hybrid manufacturers tend not to put battery modules parallel. Having 6kWh at ~24v means it is probably for a 90+kWh car at 96s. But I don't recognize the modules from Audi E-tron, Jaguar Ipace, Mercedes EQC and of course Tesla Model x/s. Of course it could still be off some low voltage...

Yeah I saw it now, and also in the manual. The example table doesn't seem correct, but later on there is a table about automatic wiring: 14S BC12~BC18 short, All connect the 12th string of positive pole of the battery pack Which must mean, just like commented in this thread, that the 13th...

@sunshine_eggo The discussion is not if this is useful. I'm perfectly fine with this not being useful, it would only prove my theory. The question is not if there is enough wind, the question is if my setup is okay. I am not saying it should do 600 Watts now, I mean that it could achieve that...

Ok I used this BMS parallel, 2 times a 10kWh NMC block. I didn't like it. It might look like parallel is better with the relays but now I think it is actually worse. Because a purely MOSFET BMS is contentiously busing with monitoring and possibly limiting current. When the relay is open, it just...

TLDR: 48v li-ion NMC battery modules, why does JBD 3.7v bms 7s-20s descirption say that it is not good to parallel them, if I don't expect balancing currents higher than BMS can handle, protected with a fuse for each 48v module? Long version: Hi all, I have 2 times a 14s 10kWh block, it is NMC...

I've got a bunch of yellow Winston LFP cells from 2015 (it is almost 40kWh). They are coming out of an EV. 2 out of the 200 cells are dead, and they are barely bloated. In the EV, they were there in pairs of 4, with the 4 hard plastic lines/straps around them. There is another beam that just...