Solar PV battery options

There's a 10kWh DIY battery thread - which would be what the busbars above relate to, and in particular, the PWOD CALB cells

Seems very expensive, link for them?

If you have previous business with PWOD (ordering $$$ worth of batteries), they will throw in the odd set of extra busbars. I've never paid for any extra ones, have some more free ones in the post now, or so I am told. And remember every €100 you spend more than you strictly need, will make your pay back period substantially longer. As does having to wait for parts before you can deploy your batteries. Same goes for battery enclosures / cases, additional BMS that you don't strictly need, fancy contactors and fuse setups, battery monitoring systems, etc.

As for busbars, I'd rather take a piece of copper tubing, hammer it flat and drill holes in it and insulate it with cheap electrical tape, instead of spending big money in AliExpress on busbars and having to wait months to get them.

How many people have the batteries on their side vertical?

Looking at doing 16s2p going up a wall would save some amount if space.

Was hoping to avoid having it's own support as I'd have to build something serious for that.

Thinking 4 stacks of 8 https://capture.dropbox.com/ZsCTXMOgtjeOV3zz

Hi, can you provide a link for the Dyness 5.1kWh please? I have one already and so would like to add a second one.

Is it 15S or 16S? I have 4 5kWh 48v dyness batteries but they are 15S not 16S, meaning I am limited to paralleling with other 15S units.

Adding 10kWh to an existing 5kWh would be fine as long as the batteries are the same - not necessarily the same brand but the same voltage and the same setup.

True.

If you go with one brand - say Dyness - 16S 48v nominal and then add in some no name server rack battery that is also 16S 48v, that would work with comms over can, right?

Alternatively you could go a road well traveled on this forum, sell the Dyness and buy calb cells!

So what I’ve got now is a

Battery Lithium 5.1kWh Dyness BX51100 48V

This website has one for €1800, has anyone bought from here before? Any other places people would recommend buying from?

https://www.wccsolar.net/product-page/bater%C3%ADa-litio-5-1kwh-dyness-bx51100-48v?lang=en

I've got the same, was looking at that website as well, not sure about them looking at the reviews, most of the positives seem to be fake. Sent them an email, 178 euro shipping.

Those batteries are very hard to source. Got a quote of 2200 ex vat from irish supplier. I might be selling one in a month or two, no way it is a good investment at those prices. Will probably go down the China route.

yep you can totally go with a ac coupled inverter and battery or hybrid inverter with battery if you think you might be able to add some solar at some point.. very good case for filling a battery at night with cheaper electricity and using during the day to cover the house load without importing from the grid

Thanks so much, I've been following (stalking?) Manion's progress with great interest. I guess, as many installers are not keen I was looking for Plan C, D or E 🙂

Mick, If I was to look towards such a solution are there recommendations for the same? I reckon that I use about 10-13kWh per day (excluding car charging)

Do you have any other S roof, like a flat roof (I've 5 panels on one), or a shed? Then the small S roof isn't some much of an issue

3 panels on a string on it's own will cause issues. Voltage is too low for the string to wake up so output is much lower (wakes later and goes to sleep earlier). I got caught on that. That's all one roof fits

Hey Big_red - howdy and welcome.

So, no.....not crazy at all. I would however reverse the order of Yr1 and Yr2 and the reason being is that you'll get a lot of stuff done "for free" in the solar installation which you can then use for the battery installation.

280aH batteries seem to be the weapon of choice. I'm looking at this playing field myself. There's 304aH out now too. Ballpark (ballpark!) €2000 for 16x cells here. Some have seen them as cheap as €1400-1500, via china and some (which I'm likely to go for myself) via Netherlands for €2400 ... again for 16x.

So if you are looking at 16x4 you'd be talking €8000 for the cells, then there's the BMS, active balancer , wiring, inverter (ME3000) etc and you'll be the guts of €10K. But at that you'd have a kick ass system of 50-60Kwh storage - which is great, but it only allows you to get some cheap power from night during day. Bear in mind there are some "gotchas" in this space now and forthcoming. For example some of the tariffs out there only allow 3 hrs "cheap night" rate tariff, so it's hard to squash 30-40Kwhr into a battery at night. D/N makes it easier, but we don't know where we'll be in 2-3 years yet with DN and the introduction of smart meters.

I think I'd rather spend the €10K and get "free" power from sun rather than cheap night rate. Get the solar in and they'll (the sparks) kit out your inverter to CU which means when you come along for the DIY battery, you have the correct guage and path in place.....assuming you have space for 4x big ass batteries.

Turbine - theres a few here doing that. one whos' got a very good results, but I'd park that, it's great - but you want to see where your at with the solar/battery first.

interesting project though.

I would however, really (no REALLY!) look at your consumption. 15,000 Kwh doesn't seem right, I'd say there's a LOT you can do there to get that down by looking at what/what/when is the consumer.