Quantum batteries

[nowty]

billi,

To clarify some of what has been said.

Each Pylontech battery unit is 48v and contains 15 x Lithium Iron Phosphate cells in series. The U2000 series ones (there are now several variants) most of us have are 2.4kWh capacity each and cost circa £750. The newer U3000 series are 3.5kWh capacity and cost about £1075 each.

You can easily connect up to 8 units in parallel using their 25mm interconnect cables.

They work in a master / slave configuration, the first unit is the master with any other units being slaves and are connected together with ethernet patch cables. If any have a problem, they will shut down and give an audible and visual alarm. They can work together either stand alone like I use or the master unit is connected to a compatible inverter. I use in stand alone mode as I have several banks of different types of lithium batteries in parallel connected to my battery inverter and I fool my inverter to think they are lead acid but that requires several tweaks to the settings on my battery inverter to make this work.

So they can work with almost any battery inverter if using them this way but preferably using a compatible inverter if possible.

Each battery unit takes care of their own cells.

I have ran mine now for nearly 5 years without issues.

My Pylontechs

[Stinsy]

wow that was fast ....

So system design for a house should be 48 Volt ? as that is the Battery voltage of each module

8 modules

sounds plenty

tied back into a hybrid inverter with an onboard bms

So one needs a specific inverter that controls those several battery units ? Or are the individual (think 2.4 kWh each ) units not taking care about each of their cells ?..... Ok still early in the morning but i found infos .... 6000 cycles sounds.... amazing

Yes it is a 48V system. So current levels are that bit more sensible compared with 24V. (It is a 15S LiFePO4 setup).

Yes 8 modules is plenty. I have 5. Could really do with 1-2 more. But I have a 5-bed house with 2 adults, 2 kids, a dog and very diverse array of appliances including an energy-intensive aquarium.

The batteries have their own onboard BMS. However that BMS is programmed to present itself to the inverter as a single entity.

Most modern inverters are compatible with the Pylontechs, including Victron, SoFar, Solax, LuxPower and the rest.

You can operate them without communication, using Voltage for control of the charge/discharge rate. But in the scheme of things it is better to get an inverter that talks to the batteries directly.

[billi]

Thanks Stinsy & Nowty

I have to revisit my "old" battery history and rethink future plans ...

Basically , even if i go off grid again , i just need the battery capacity of a day"s usage i suppose, as long as i have enough generator

That brings me back to my older thoughts , to oversize generator and regard that too as some sort of a battery storage


Anyway just thinking

[Tinbum]

You can easily connect up to 8 units in parallel using their 25mm interconnect cables.

With the US2000C and US3000C you can run 16 in parallel. (You would need some more inverter / battery power cables though to use the full power capacity).

[billi]

well i asume or know i need not much more than max 2 kWh during the night

So basically the demand for huge storage ideas are obsolete , what still is reality is , is where the energy is coming from


Am pretty sure a 10 KW PV can even me cover all year round ..... and would not have a problem to invest or install for say 5000 Euro for the PV

but what should i do with those 8000 kWh surplus ? per year .... feed it into the grid and even if i get a few cents in return , i read later in the Press that electricity prices are skyrocketing


Well sure 7 cents per kWh i would get , 30cents it is sold on back to home owners like me

Not sure right now what route to go

[Joeboy]

well i asume or know i need not much more than max 2 kWh during the night

So basically the demand for huge storage ideas are obsolete , what still is reality is , is where the energy is coming from


Am pretty sure a 10 KW PV can even me cover all year round ..... and would not have a problem to invest or install for say 5000 Euro for the PV

but what should i do with those 8000 kWh surplus ? per year .... feed it into the grid and even if i get a few cents in return , i read later in the Press that electricity prices are skyrocketing


Well sure 7 cents per kWh i would get , 30cents it is sold on back to home owners like me

Not sure right now what route to go

The first thing to do Billi is to map out and record your power use in Winter. That's your worst case scenario. Then split it up against what RE solutions you have in place. Can you move any of the required load about and onto your existing RE solutions?

We (a few of us at least) are fans of brick storage heaters, these can be an inexpensive way to hold onto the energy that we generate. The other obvious one is a hot water tank. They can soak up a lot of generated power to the benefit of you and family.

There is of course the excellent mantra of Insulate, insulate, insulate along with low energy bulbs and appliances AND timeshifting those appliances can possibly put you into a place where you won't really need batteries? All depends on how burning the ambition is to go fully offgrid or swick it and buy a little from grid knowing that you'll never get a couple of kW'hs per night back in a battery investment.

Don't get me wrong, I absolutely love my battery stack but Its not always the solution as its damned expensive and a long term commitment. That's not for everyone.

When I plan anything, I tend to work backwards from the required final state and then develop a solution to get there. Power consumption and your personal grid/off grid hopes would be my first pass at this.

[billi]

thanks Joeboy

this time i have a river/steram infront of my house , and i will , this way or other ways, use that as a constant battery

So i might just need a small but strong buffer battery

[Moxi]

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