Idiot's guide to a self build battery

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Joeboy
Posts: 7215
Joined: Mon May 31, 2021 4:22 pm
Location: Inverurie

Re: Idiot's guide to a self build battery

#1071

Post by Joeboy »

We've seen the benefits of the larger capacity stack and larger solar net over the last couple of days. The net has harvested all it can and in marginal, raining, cloudy weather it has been enough coupled with much appreciated flashes of fast charging.

The larger stack has stored it all and given us the confidence to leave the grid charge button switched off on the hybrid inverter. I know for sure that I'd have been tapping the grid by now in smaller stack times.

We are averaging 0.75kWh per day from grid and most of that is down to us. At 07.30hrs today in cloud cover we have 1.5kW incoming and 39% soc. The HWT is fully charged and there are 70 miles on EV.

Having run through the house multiple times over the years to reduce power we are now in a magic place. Just coming up to our 6 yr anniversary since first panels installed. :D

The bigger battery though, absolutely pivotal in this endeavor.
18.2kW PV SE, VI, HM, EN & DW
Ripple 7kW WT & Gen to date 11MWh
42kWh LFPO4 storage
95kWh Heater storage
12kWh 210ltr HWT.
73kWh HI5
Deep insulation, air leak ct'd home
Zoned GCH & Hive 2
WBSx2
Low energy bulbs
Veg patches & fruit trees
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Colin Deng
Posts: 167
Joined: Mon Nov 21, 2022 8:33 am

Re: Idiot's guide to a self build battery

#1072

Post by Colin Deng »

Joeboy wrote: Thu May 30, 2024 7:59 am We've seen the benefits of the larger capacity stack and larger solar net over the last couple of days. The net has harvested all it can and in marginal raining cloudy weather it has been enough coupled with flashes of fast charging.

The larger stack has stored it all and given us the confidence to leave the grid charge button switched off on the hybrid inverter. I know for sure that I'd have been tapping the grid by now in smaller stack times.

We are averaging 0.75kWh per day from grid and most of that is down to us. At 07.30hrs today in cloud cover we have 1.5kW incoming and 39% soc. The HWT is fully charged and there are 70 miles on EV.

Having run through the house multiple times over the years to reduce power we are now in a magic place. :D

The bigger battery though, pivotal in this endeavour.
Actually, now the V3 version of the 280k, The capacity is usually about 300ah
So the capacity is more than it expected !!

Also working on a new product, battery with inverter and EV charger all in one
Colin Deng
Battery supplier for battery cells and pack
guohed070@gmail.com
SimonSays
Posts: 25
Joined: Tue Jun 07, 2022 10:08 am

Re: Idiot's guide to a self build battery

#1073

Post by SimonSays »

Saw this very pretty home storage over on Twitter
Seems to be based on the work by Dala, interfacing CANBUS between EV batteries and commercial inverters: https://github.com/dalathegreat/Battery-Emulator
It's HV DC (the EV packs remain sealed) and so you'd want to be very careful working around them. Probably not a big issue for those who are self installing PV.
NoraBatty
Posts: 36
Joined: Sat Mar 23, 2024 10:40 am

Re: Idiot's guide to a self build battery

#1074

Post by NoraBatty »

Batteries arrived 10 mins ago in the pouring rain.
Have yet to unbox or look at them, just stored them out of the rain. I will get round to it this weekend. Thanks Colin for such a speedy service.

Ive made progress on the plumbing and insulation side of things, but yet to start on the shed to house all of the battery equipment. I opted for a metal shed in the end, i insulat and sheath ithe inside in ply/cementboard for the gubbins to be installed.
Too busy at work with too many other projects going on to make my own from scratch, so just have a concrete base to mix up.
Expect a deluge of photos when ive fixed everything up. 👍
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Joeboy
Posts: 7215
Joined: Mon May 31, 2021 4:22 pm
Location: Inverurie

Re: Idiot's guide to a self build battery

#1075

Post by Joeboy »

That's great news, exciting times! The packaging is such that a bit of water won't be an issue. Each battery unit is fully encapsulated in about 2" foam. All the best in the build, it's great fun. 👍
18.2kW PV SE, VI, HM, EN & DW
Ripple 7kW WT & Gen to date 11MWh
42kWh LFPO4 storage
95kWh Heater storage
12kWh 210ltr HWT.
73kWh HI5
Deep insulation, air leak ct'd home
Zoned GCH & Hive 2
WBSx2
Low energy bulbs
Veg patches & fruit trees
NoraBatty
Posts: 36
Joined: Sat Mar 23, 2024 10:40 am

Re: Idiot's guide to a self build battery

#1076

Post by NoraBatty »

Well they are in my dilapidated, also need to be replaced main shed currently. The boxes wouldnt last long in this weather, so best stored inside asap.
I ordered the shed base materials over the weekend. Should be here end of the week. Just need the rain to ease for laying the slab, then the wind to ease for making the shed!

Then at least they can be put in their leak free permanent home. Even though im waiting on the enclosures, and the electrician!
Ive already talked myself into ordering another 15kw at some point. 🤣
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Joeboy
Posts: 7215
Joined: Mon May 31, 2021 4:22 pm
Location: Inverurie

Re: Idiot's guide to a self build battery

#1077

Post by Joeboy »

NoraBatty wrote: Mon Jun 10, 2024 12:40 pm Well they are in my dilapidated, also need to be replaced main shed currently. The boxes wouldnt last long in this weather, so best stored inside asap.
I ordered the shed base materials over the weekend. Should be here end of the week. Just need the rain to ease for laying the slab, then the wind to ease for making the shed!

Then at least they can be put in their leak free permanent home. Even though im waiting on the enclosures, and the electrician!
Ive already talked myself into ordering another 15kw at some point. 🤣
Once you are in it and see the benefits it's hard not too. I started with 4.8kWh, a pair of Pylontechs. At 40kWh+ now We're at the Goldilocks place for this house.
18.2kW PV SE, VI, HM, EN & DW
Ripple 7kW WT & Gen to date 11MWh
42kWh LFPO4 storage
95kWh Heater storage
12kWh 210ltr HWT.
73kWh HI5
Deep insulation, air leak ct'd home
Zoned GCH & Hive 2
WBSx2
Low energy bulbs
Veg patches & fruit trees
User avatar
Colin Deng
Posts: 167
Joined: Mon Nov 21, 2022 8:33 am

Re: Idiot's guide to a self build battery

#1078

Post by Colin Deng »

NoraBatty wrote: Mon Jun 10, 2024 10:25 am Batteries arrived 10 mins ago in the pouring rain.
Have yet to unbox or look at them, just stored them out of the rain. I will get round to it this weekend. Thanks Colin for such a speedy service.

Ive made progress on the plumbing and insulation side of things, but yet to start on the shed to house all of the battery equipment. I opted for a metal shed in the end, i insulat and sheath ithe inside in ply/cementboard for the gubbins to be installed.
Too busy at work with too many other projects going on to make my own from scratch, so just have a concrete base to mix up.
Expect a deluge of photos when ive fixed everything up. 👍
Good to know that the battery arrived!
Waiting for the system build

Thank you
Colin Deng
Battery supplier for battery cells and pack
guohed070@gmail.com
Andy
Posts: 468
Joined: Sun Aug 29, 2021 12:16 pm

Re: Idiot's guide to a self build battery

#1079

Post by Andy »

Mine arrived a day later :) The DPD driver was bemoaning the fact that all the heavy boxes were at the start of the day :lol: Thanks Colin. There are some much appreciated improvements to the packaging. Last time, the bolts and busbars did start little journeys around the packaging. Also, some serious contortions were required to get some of the batteries out of the foam. This time all the bolts/busbars are in a little packet keeping them together and the batteries are in little sleeves that makes them infinitely easier to remove from the foam. I've just disconnected all the Pylontech since they were just above 50% and am now slowly building the remaining stacks. Lots of crimping still do to, but at least all the wires are cut to the right lengths already.

I must concentrate more than last time. I ended up with the wrong lugs on a few wires and I don't have spares.
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