Have you got the file to I compare my saving before splashing out of massive battery.
I wrote a little app last year to calculate this stuff. Two different methods, but since it's better to export (with FIT) than it is to store in the battery, let's change "method 2" to 365 days charging.
So about 8 years to payback a 5Kwhr battery costing €2400 with €0.28 day and €0.078 night rates. This is assuming you do this every single day. Fill up your battery at night and use those 5kwhr during the day. In reality you won't do that as I'm sure you will take vacations and not be in the house etc. so let's call it 10 years.
I've been binge watching his channel. A great source of information and he's quite easy to listen to, well spoken.
I'm going to be looking for some dyness batteries in the near future. I've had 20kWh of them installed by the installer but I see from the spec sheets they can have up to 40 in parallel so I will be buying more! (and sussing out a victron quattro inverter too, to be the main inverter and relegate my current solis to a ac output of the quattro)
We really need to calculate what 5kw battery can expect to save in year. That price might be the "market rate" but does it even pay for itself over 10 years? Ie can u save 240 a year? I know it could last longer than 10 years... but some sort of benchmark to measure costs/value.
Either FIT OR nightrate plus summer charging. Whatever is most....
There was a guy on the fb group from the North about a month ago offering the same from the North. That's £2500 excluding delivery or fitting if I remember correctly. €2400 is probably about right if you can fit yourself
A battery can either charge or discharge not both. I can go into it more but the short answer is no.
It can be automated but it's a bit DIY via home assistant/something
Yes in theory you can buy on night and export during the day. But there's about a 20% round trip loss, also you would need to have a smart meter as your export isn't measured on the standard day night meter.
Was wondering with batteries can they be automated to charge up during night rates and then that power used during the day as needed? And can they both charge and discharge simultaneously, ie while it the battery is charging at night time can it also power the fridge freezer at the same time?
Also (in theory) could you fill up a battery on night rates and then sell that power with the FiT at day rates? I saw an article about the FiT and most of the companies are paying around 17 cents per kwh, whereas my night rate is 0.095, can consumers make a profit or is there something preventing that.
Guy up north with puredrive,5kw,2400£, collected.
i wasn’t sure if that was a good price?
Has anyone experience of the JK BMS? How does it compare to Seplos aside from the fact that Seplos can be daisy chained?
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The only way to maximize that would be to get two Sofar battery chargers in parallel, wire one battery to each and then you would get a constant 100a in theory (as long as the 50a can be sustained by the battery) but I doubt the financials make sense.
Thought about this myself since with 4x dyness I can pull 200a max, and two sofars would get me constant 125a at least but it's easy to stay under the 5kwh in fact
Thanks for the reply.. phew.. .. yup I get the peak output on the inverter and I’m ok with that as I knew about it when I bought it.
If you have a Solis hybrid then yes (if you look at the spec sheet, it says it can charge/discharge up to 100a) but we were sold a bunch of BS and it can only sustain 5kwh for about 15 mins then drops to about 3.5kwh so yes you will get more than 2.5kwh but not double.
Thanks for the reply .. Maybe I didn’t word it quite right .. if I have 2*50A batteries In parallel then the max draw could be 100A so where previously I could power a sustained ~2.5kw draw when 2 are connected it could be ~5kw rather than Solely a 2.5kw draw for twice the length of time ?
Does anybody know of an electrical wholesaler that supplies Puredrive II 5kW batteries?
@runner2011 For the Dyness, the capacity will double, but charge and discharges RATES would be unchanged I would expect
@theRed73 and ME3000 can only charge from the grid at a rate of 3kW, so it could be that a Hybrid may be able to charge at a higher rate. A separate Storage Inverter gives you a bit more control - like charging a car or heating water before a battery.
I have a question that I'm hoping somebody can help me with , well kind of two questions. I had a Dyness a4800 4.8kw installed today and Waiting on the second one to be installed in about a week. The Solis inverter has a preselect for the Dyness Battery all good and working away. The battery parameters section are at what appears to be default or maybe they were set by the BMS? The Charge and discharge limitation setting are both at 50A .. the Dyness manual recommends 50A discharge .. it will do 75A (Max discharge power 3.6kw)and 100A for 15s .. should I set the two parameters to 100A / 75A / leave at 50A and will the BMS control it for the correct limits and duration? ..Secondly when the additional battery gets added ..whatever the correct charge and discharge parameters are will double..right? Thanks a mil.
I was planning on installing the PV inverter in the garage next to a sub consumer unit and run grid power & cat6 in ducts to the main CU.
That would put the PV inverter in the same location as the batteries.
The advantage of a separate storage as I understand it would be increasing my ceiling for charge from grid & discharge current to load.
Any other advantages in having a battery string on a storage inverter? Monitoring, IFTTT, tweaking, etc?
I'll likely run with just the PV inverter to get started. Just ordered 32x 200Ah from PWOD so distilling the shopping list from this discussion next...
With two packs, they are daisy-chained for the BMS but joined at some form of switch / busbar for the DC cables
A separate Storage Inverter allows the batteries to be located in a separate location to the Solar Inverter. It also allows the Storage Inverter output to be in addition to the PV Inverter
After binge reading 83 pages here I'm really impressed with the depth of knowledge that you guys have shared here!
I'm planning to pull the trigger on a decent sized array on a garage I'm building and go done the DIY battery route. I'm consuming about 16MW per year so committed to a 10KWhr battery and likely a second. That would give me 2x 16s packs.
I have a question regarding inverters. Should I stick with an installer provided hybrid like to solis 6KWhr (with 100A charge/discharge) or opt for dedicated storage inverters?
Can I plug both packs into the solis or would the second pack requir a dedicated inverter?
Thanks!
I have a Pylontech US2000B 2.4 kWh Battery with cables and bracket for sale if anyone wants to make an offer. <1 year old never abused. PM me.
Thanks. If you hear of anyone that wants to part with one please let me know...
Hi. I'm afraid not. It's going to another boardsie.
Hi,
I don't suppose you still have that battery available?
You need to ensure your house cannot feed electricity back into the grid in the event of a blackout.
The idea is that if an ESB Engineer is working on the line and expecting it to be deenergised then they might get a shock if your house is powering the local grid
You need to discuss it with your installer, they should be able to install an inverter that had a built-in anti islanding switch
is the EPS solution basically a switch that you can isolate yourself or the inverter from the grid to avoid the issues of it trying to send or pull from the grid while its out of action?
Not sure your gettng it. But basically it's an outlet/socket from the inverter. I can't remember the specific connection type, but it's not a regular one. From that you could then wire up a 3pin socket something like this lad has done (not mine)
Then things you plug into that specific socket would come from the battery, even during a power cut. You could simply run a cable from your inverter to the living room and then power the telly etc. via
Masterplug 50 Metre 4 Gang Heavy Duty Cable Reel | Woodie's (woodies.ie)
Simple solution.
Alternatively you can do something more sophisticated with change over switches and power a specific circuit such as downstairs sockets/lights using that same output but you need to be careful here that you correctly and properly isolate your house from the external grid or you run the risk of grid feedback which is a no-no.
Well my question is obviously specifically about the coming winter and maybe a few to follow, right now its looking like any outages would be at peak time and id ideally like to be able to switch over during this time if it was necessary, is the EPS solution basically a switch that you can isolate yourself or the inverter from the grid to avoid the issues of it trying to send or pull from the grid while its out of action?
Yes, it's possible with varying degrees of effort/cost.
So inverters that we install are "grid tied", meaning when the grid goes dark......the inverter ceases to function. It won't charge the batteries from solar (assuming it was during the day) and it won't supply the house, at least not directly.
You can however power "some" things from the battery. The easiest way is to use the EPS (Emergency Power socket) which most inverters have. This you can wire to a 3pin socket and from that you can run say an extension cable down to your living room and run the tv etc. While it would be fine for that, you won't be able to run the full house from it.
If you had a more sophisicated (costly) setup, you could wire switch overs which depending on how your house is configured, you could wire that EPS output into your fuseboard, but generally most (99%) people will never have a need to go beyond the extension lead I think. Maybe I'm wrong.
Question about possible blackouts, ive seen conflicting info about being able to run your house off your battery in the event of a blackout? How does this work and is it possible, ie do you have to ask the installer to set it up in a specific way? Im intending on having solar attached to to the battery that helps answer.
I suppose a group of people could buy some spare cells as insurance and then sell on any spares that don't end up being needed
Could go a step further and see if there's enough interested people to put in a big order for cells and get some sort of discount
