Idiot's guide to a self build battery

[nowty]

You've really made an efficient use of space there.

I've been on the roof cleaning the gutters now our hosepipe bans been lifted today. I noticed several other neighbour's doing the same in today's sunshine.

Liking the cheatsheet on the Goodwe.

[Joeboy]

Really tidy! Nice work!

Any plans to swap the Pylontechs for another string of LF280ks?

You've got £5400 worth of Pylontechs there!

I did give it a moments thought, maybe two. I'll see how it goes over the Winter with the new set up. I'm pretty much beyond where I need to be for power storage. Worst case scenario and we have grid drop out.
We have the EV 73kWh battery and onboard inverter. Half the PV stays up and charging and we default to the battery driven 2kW inverter and the 27.88kWh home storage. It would be messy with extension leads n all that but assuming the grid failed at a decent SOC we'll be good to go for a while and grab what we can through the day.

A long answer there which ends as a maybe Stinsy.

Are you fancying it?

[Joeboy]

You've really made an efficient use of space there.

I've been on the roof cleaning the gutters now our hosepipe bans been lifted today. I noticed several other neighbour's doing the same in today's sunshine.

Liking the cheatsheet on the Goodwe.

Thank you Nowty, I watched the power sliding about while I worked today. Excellent and a new dynamic in place. More power to ye from the hosepipe.

[Stinsy]

Really tidy! Nice work!

Any plans to swap the Pylontechs for another string of LF280ks?

You've got £5400 worth of Pylontechs there!

I did give it a moments thought, maybe two. I'll see how it goes over the Winter with the new set up. I'm pretty much beyond where I need to be for power storage. Worst case scenario and we have grid drop out.
We have the EV 73kWh battery and onboard inverter. Half the PV stays up and charging and we default to the battery driven 2kW inverter and the 27.88kWh home storage. It would be messy with extension leads n all that but assuming the grid failed at a decent SOC we'll be good to go for a while and grab what we can through the day.

A long answer there which ends as a maybe Stinsy.

Are you fancying it?

I'm up for it. Will be next year's project though. I recon I can swap my 12kWh pylontechs for 28kWh homebrew and remain cost-neutral. The only thing I'd sacrifice would be SoC percentage reporting.

Would you be so kind as to post an equipment list with cost breakdown?

[Joeboy]

Really tidy! Nice work!

Any plans to swap the Pylontechs for another string of LF280ks?

You've got £5400 worth of Pylontechs there!

I did give it a moments thought, maybe two. I'll see how it goes over the Winter with the new set up. I'm pretty much beyond where I need to be for power storage. Worst case scenario and we have grid drop out.
We have the EV 73kWh battery and onboard inverter. Half the PV stays up and charging and we default to the battery driven 2kW inverter and the 27.88kWh home storage. It would be messy with extension leads n all that but assuming the grid failed at a decent SOC we'll be good to go for a while and grab what we can through the day.

A long answer there which ends as a maybe Stinsy.

Are you fancying it?

I'm up for it. Will be next year's project though. I recon I can swap my 12kWh pylontechs for 28kWh homebrew and remain cost-neutral. The only thing I'd sacrifice would be SoC percentage reporting.

Would you be so kind as to post an equipment list with cost breakdown?

Sounds good to me!
£1,687- 15 of LF280K (A) batteries incl del, bus bars n bolts
£60.72 - 1 of 15s 5A balance board.
£60 framework and bolts
£20 DC-DC variable 20A buckboard (battery charger)
£38 Amp clamp (AC AND DC capable)
£60 Frankenstein breaker & 2 125A fuses
£26 2 of 2mtr lengths 25mm2 cable
£12 Hammer crimper
£36 Solder kit gear, 18awg cable & heatshrink kit
£24 lugs for AWG2 & AWG18 wire, reel of solder.
£13 100A busbar to match spare.
£14 1mtr each of red & black 25mm2 cable
£2,063 total

£153.49 per kWh installed
From the above list I could remove the buckboard (unused) and half a bag each of two sizes of lugs. Being an up in the air install changed it also. I could easily see someone achieving sub £140 per kWh depending on their current tools and skills.
Multiply that figure by the specific Pylontech unit required and its beyond a no brainer by a crazy margin.

[Joeboy]

Also, it bears repeating for anyone looking for a professional company to work with in China...

https://www.linkedin.com/in/colin-deng-2b4277238
This is the guy I've been dealing with, absolutely top notch.
https://m.alibaba.com/products/shenzhen ... nergy.html
This is the company.

10/10
A quick search for the word 'Deriy' on Alibaba will bring ip the company.
This letter in the delivery, I liked that touch very much indeed.

[Andy]

I'm just catching up. It looks great, nice work.

[Andy]

£1,687- 15 of LF280K (A) batteries incl del, bus bars n bolts

It's amazing how cheap it is to ship from China. Just shy of £200?

[Joeboy]

£1,687- 15 of LF280K (A) batteries incl del, bus bars n bolts

It's amazing how cheap it is to ship from China. Just shy of £200?

Something like that. Didn't pay much attention to the breakdown in price.

It all seemed well within expectations.

[Oldgreybeard]

It's amazing how cheap it is to ship from China. Just shy of £200?

Shipping goods from China is very heavily subsidised by the Chinese government, to encourage and promote international trade. This is permitted because China still has some sort of exemption that allows this, due to some sort of "developing nation" clause in international agreements. In reality the true shipping cost is probably much greater than the nominal £200 that's been charged. Not sure how much longer subsidised shipping and postage from China is going to last, so it probably makes sense to order sooner, rather than later, as I'm sure this dispensation will be removed before long.