Battery - to take advantage of 2am to 5am cheap rate electricity

It’s no different than connecting an off the shelf battery. The inverter is connected to the grid and the battery is connected to the inverter. Once the inverter and battery settings are set up, it’s pretty much plug and play. My videos cover that aspect too.

China. EU stock was considerably more expensive. 7-10 days to ship, 60-70 days to deliver, should be here early to mid December.

90 days is more realistic so be prepared for that.

Just tell them to wire the battery fuse/disconnect to the inverter and then you just wire up the batteries yourself, very easy to do.

You also do NOT need RECI approval to connect DC batteries to your system so for insurance purposes you're all good.

You can do the batteries afterwards yourself. Just have the battery case and fuse holder dimensions before the RECI starts and ensure space is left for them.

Similar setup and I'm using 35mm2 from the batteries to the switch and then 140mm2 from both + and - to inverter 2x70mm2 for + and - which is overkill but the inverter requires two connections for each to reach 300a and the cables aren't getting hot.

Was thinking about that calculator as well and how it underestimates the value, as I might split the batteries to bus bars so I can add a rectifier for extra pumping in winter.

Also that 400a bus bar has 11 holes in it, surely if you remove all that copper then it should no longer carry the same?

Where is best to buy the copper busbars? If I can buy local (Dublin) for a decent price, I will. Otherwise it looks like Ali-Express and a long wait….but then I will be waiting a good while for another set of cells and a Seplos kit, which are out of stock at NKON and Fogstar.

For the busbars, i'm thinking of getting 500mm lengths of 5x25, so I can work with them in sections. When I need to add more length, I will drill a couple of holes in the ends of each length and bolt them to eachother with a good 30mm overlap.

I've seen domestic bus bars been given different ratings depending on how you connect them.

So if you connected your inverter at one end and the batteries at the other then the bar will see the whole current as apposed to connecting the inverter in the center and the batteries at the ends its only seeing half the current .

About to take the plunge on a Yixiang DIY Case and 16x 280Ah REPT cells for about €1,450 after payment processing fees. Seems like a good deal, but hoping someone wiser can let me know if I'm making any glaring mistake with this order.

For context I have a SAJ H1-4K-S2 hybrid inverter and 4.4kWp solar array to go with this.

Case Link (https://www.alibaba.com/product-detail/YIXIANG-DIY-16S-48V-51-2V_1601258989869.html)

If I can pull 300a over 3x35mm2 cables without them getting hot then you don't need bus bars 😂

But yes if you daisy chain multiple batteries between them with short cables it is not great, they will get out of sync, saw it on the old dynesses, all of mine now go to the switch with individual cables of the same length and stay balanced now

Good shout, shipping is DDP and coming from warehouse in Poland so should be all good on that front. Only minor snag is delivery is not expected until November 15th. Reviews of the case seem good on YouTube and assembly seems beginner friendly.

Maybe I missed it but I don’t see any thread specifically discussing the best plans to go on that would also take into account FIT? The switcher sites don’t make any attempt to include it from what I see.

Since I am a new build I have no feel for what our usage will be but we will in theory be fairly heavy users - relatively large house, 11kW A2W heat pump, all cooking will be electric/indiction, heavy enough users of clothes dryer with kids etc etc.

We have a 10kWp solar system installed and 10kWh battery to go in after 2nd fix but I’m reluctant to go for the plans that are very expensive most of the day with the EV night rate incase we go through the battery too fast in winter especially. So u think probably a day and night rate might be best with no super high peak. Yuno for example looks to be the cheapest but they pay the least for FIT.

Maybe be not place to discuss but happy to be pointed to another thread or forum. Thanks.

Eco power optimiser app allows you to build a load profile based on historical or expected usage patterns. It will use PVGIS for solar data, and simulate a year. It will calculate and compare prices for whatever suppliers plans you have added. All you need is an Android device with Android > 9

Thanks very much this is great information, I will put aside some time to properly go through and digest the figures.

Yes we would be similar I think from a house perspective airtight, MVHR, HP, target of A1. We don’t have an EV or PHEV and unlikely to go that route in the near term so wouldn’t be contributing to our usage on that front.

That was me. The norm is they arrange collection of faulty cell(s) and when they receive, they will send replacements. In my case, I ordered a cell because I didn't want to wait longer than absolutely necessary. This meant I had to pay delivery. I was refunded the cell cost when NKON received the faulty one.

I wish it was that easy. Several different tests and strong of emails and latest reply from them is:

"Arranging a shipping back from Ireland to the Netherlands so far has never been successful as the shippers system does not accept Irish pickup addresses."

I have already ordered a cell from them due into stock in two weeks but would have hoped for a better customer service than what I have got from them so far. Hoping they will come good though after reading others experience with them here

Have the local installers here dropped their prices much in the last year? I’d like to add another 10KW to my existing 5KW Dyness BX51100 battery. I’m not really inclined to go the DIY route so don’t mind paying a bit more for someone to come out and do it for me.

Hi

Im in the early stages of "dreaming" of getting a battery for my house but with two kids in college and the general flaithiúlach lifestyle of my family 🤔 it might be another year or two before I can gather the funds for one…  

That said, I am an ideal candidate for a battery in that I consume about 18,000 kWh a year, import about 15,000 kWh, 7000kWh of that is my EV and 4500 into the Heat Pump. I have a 6.1 kWp Solar PV system Im an all electric house. 

My question is what would you guys recommend I do given the fact also I have a 16 kVA connection so I have the capacity to pound the kW into a battery at night.

Would I replace my existing Solis 6 kW inverter and get a hybrid inverter or would I leave that alone and get an AC coupled battery with an additional AC inverter/charger .

Given my usage I would/should get something like two of those 15kWh fogstar Seplos kits so 30 kWh of battery storage (or more possibly with 16 kVA connection..)

What you you do in my situation. Thanks    

You actually consume more than me. I’m at 15k units per year.

I have 2 x 15kWh Seplos batteries and a third on the way from fogstar.

Using cheap night rate, a single battery will easily be paid for in savings over the course of a year.

The extra cost is the hybrid inverter, but you’ll get a couple hundred for your existing inverter. Replace with a Solis hybrid, or SunSynk, as you’ll be able to get help here for your setup.