Idiot's guide to a self build battery
Re: Idiot's guide to a self build battery
Happy New Year Colin, stay Safe. All the best to your family from us guys.
19.7kW PV SE, VI, HM, EN & DW
Ripple 7kW WT & Gen to date 19MWh
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
Ripple 7kW WT & Gen to date 19MWh
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
- Colin Deng
- Posts: 199
- Joined: Mon Nov 21, 2022 8:33 am
Re: Idiot's guide to a self build battery
Thank you Joe ,Happy new year to you and your family , also everyone in this group
Actually having the CNY holiday now, just get back home today with family
Colin Deng(Batterycolin)
Battery supplier for battery cells and pack
Email:guohed070@gmail.com
https://www.linkedin.com/in/colin-deng-2b4277238/
Battery supplier for battery cells and pack
Email:guohed070@gmail.com
https://www.linkedin.com/in/colin-deng-2b4277238/
Re: Idiot's guide to a self build battery
Kenny, is there any data with your cells that indicate expected cycle life? I see quite a variation when it comes to the EVE 304 cells that I think you have.
10x 405W JA Solar panels (4.05kWp) @ 5 degrees
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
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- Joined: Wed Aug 31, 2022 9:16 am
Re: Idiot's guide to a self build battery
When I did my research I was looking for 6000+ cycle cells. I believe these EVEs can do this. But I think Colin would have a better idea on the data for these cells.
Here’s the spec sheet Deriy gave me -
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- Posts: 78
- Joined: Wed Aug 31, 2022 9:16 am
Re: Idiot's guide to a self build battery
Ok just to note for day 3.
Batteries are all connected up everything all fine and dandy. No sparks, zaps, burns. The one time I didn’t have my gloves on, I did get pierced by small stranded wire from the battery cables.
I discharged the pylons to around the same voltage as the Batteries (approx 49.8v) and disconnected the fuse and turned off the pylons. Connected the diy pack and Pylons in parallel. Reconnected the fuse and allowed power.
I did make a boo boo here. I thought the BMS didn’t have any capability to turn on or off supply, so thought it was working. Measured current, very small current going through the DIY stack during charge (3amps) when it should be at least 1/2 of the inverter supply. I also noticed my SOC on the pylon was dropping as it did before connecting the battery.
So I realised that I didn’t turn on the Charge and Discharge function of the BMS and so it wasn’t doing anything.
After turning it on im seeing a discharge current, and a charge current when charging.
Seems you actually need to install and use the App to use the BMS. If I ever need to disconnect it, looks like I can just switch the BMS Charge/Discharge to Off and that kills the current.
So I’m done, will be keeping an eye out over the next few days and report any unusual activity.
All in all, no disasters, my house is not burned down (yet) I’m technically still 1 week early on my set up. (FYI it took 6 months to receive my pylontech)
Batteries are all connected up everything all fine and dandy. No sparks, zaps, burns. The one time I didn’t have my gloves on, I did get pierced by small stranded wire from the battery cables.
I discharged the pylons to around the same voltage as the Batteries (approx 49.8v) and disconnected the fuse and turned off the pylons. Connected the diy pack and Pylons in parallel. Reconnected the fuse and allowed power.
I did make a boo boo here. I thought the BMS didn’t have any capability to turn on or off supply, so thought it was working. Measured current, very small current going through the DIY stack during charge (3amps) when it should be at least 1/2 of the inverter supply. I also noticed my SOC on the pylon was dropping as it did before connecting the battery.
So I realised that I didn’t turn on the Charge and Discharge function of the BMS and so it wasn’t doing anything.
After turning it on im seeing a discharge current, and a charge current when charging.
Seems you actually need to install and use the App to use the BMS. If I ever need to disconnect it, looks like I can just switch the BMS Charge/Discharge to Off and that kills the current.
So I’m done, will be keeping an eye out over the next few days and report any unusual activity.
All in all, no disasters, my house is not burned down (yet) I’m technically still 1 week early on my set up. (FYI it took 6 months to receive my pylontech)
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- Posts: 78
- Joined: Wed Aug 31, 2022 9:16 am
Re: Idiot's guide to a self build battery
Checked the voltages on DIY stack and Pylons, they are now the same as reported from HA (pylontech) and the jk BMS (diy). Did not take very long for them to equalise at all.
Unfortunately, I can’t check that often as the Bluetooth on the BMS has literally <5 meter range. (Until I get it hooked into HA)
Unfortunately, I can’t check that often as the Bluetooth on the BMS has literally <5 meter range. (Until I get it hooked into HA)
Re: Idiot's guide to a self build battery
Thanks for datasheet Kenny, I'm trying to weigh up EVE 280K with high cycle life, Vs 304 with less cycles but more capacity.
All made more tricky to decide by the fact the cells will never be charged or discharged at 1C, nor see crazy high temps.
All made more tricky to decide by the fact the cells will never be charged or discharged at 1C, nor see crazy high temps.
10x 405W JA Solar panels (4.05kWp) @ 5 degrees
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
Re: Idiot's guide to a self build battery
Don't overthink it, whichever ones you buy, your batteries will die of old age (calendar life) long before they die of exceeded cycle life. If I go off cycle life my pack should last me about a century.
16.9kW PV > 109MWh generated
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Rain water use > 510 m3
Ripple 6.6kW Wind + 4.5kW PV > 25MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
Re: Idiot's guide to a self build battery
You're quite right, thinking about it logically I'm really not going to see any real issues for a very, very long time.
It's a holdover from my time playing with li-ion packs, but lfp is a very different kettle of fish.
10x 405W JA Solar panels (4.05kWp) @ 5 degrees
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
- Colin Deng
- Posts: 199
- Joined: Mon Nov 21, 2022 8:33 am
Re: Idiot's guide to a self build battery
Hi
The EVE 280K battery
Some batteries tested capacity is more than 280ah
It can be 285ah more to 289ah
Hope this info can help
Colin Deng(Batterycolin)
Battery supplier for battery cells and pack
Email:guohed070@gmail.com
https://www.linkedin.com/in/colin-deng-2b4277238/
Battery supplier for battery cells and pack
Email:guohed070@gmail.com
https://www.linkedin.com/in/colin-deng-2b4277238/