Idiot's guide to a self build battery
-
- Posts: 78
- Joined: Wed Aug 31, 2022 9:16 am
Re: Idiot's guide to a self build battery
So I let it charge last night at max amps (80a set on the inverter) between 00:30 - 04:30
From 30% SOC (5kwh), it went to 90% (15kWh) in about 2 1/2 hours (approx 3am), which according to my inverters battery charge metric is 10 kWh charged. After that it charged very slowly as normal but SOC didnt reach 100%.
here are my charts
looks like it peaks at 51v when it hits 90%, at 15% its around 48v.
I wonder if we can do anything to the pylontech BMS to reduce the percentage when it slows down? Im going to try dropping the minimum SOC to 15% and see if its worth doing anything about not reaching 100% overnight
From 30% SOC (5kwh), it went to 90% (15kWh) in about 2 1/2 hours (approx 3am), which according to my inverters battery charge metric is 10 kWh charged. After that it charged very slowly as normal but SOC didnt reach 100%.
here are my charts
looks like it peaks at 51v when it hits 90%, at 15% its around 48v.
I wonder if we can do anything to the pylontech BMS to reduce the percentage when it slows down? Im going to try dropping the minimum SOC to 15% and see if its worth doing anything about not reaching 100% overnight
Re: Idiot's guide to a self build battery
Relax! Don't mess with anything based on one cycle!Kenny000666 wrote: ↑Tue Jan 10, 2023 7:19 pm So I let it charge last night at max amps (80a set on the inverter) between 00:30 - 04:30
From 30% SOC (5kwh), it went to 90% (15kWh) in about 2 1/2 hours (approx 3am), which according to my inverters battery charge metric is 10 kWh charged. After that it charged very slowly as normal but SOC didnt reach 100%.
here are my charts
looks like it peaks at 51v when it hits 90%, at 15% its around 48v.
I wonder if we can do anything to the pylontech BMS to reduce the percentage when it slows down? Im going to try dropping the minimum SOC to 15% and see if its worth doing anything about not reaching 100% overnight
It'll take a few cycles for everything to settle down.
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
Re: Idiot's guide to a self build battery
Looks good to me, amazing that we have access to such good cells. If the majority above 280ah what a winner.
-
- Posts: 78
- Joined: Wed Aug 31, 2022 9:16 am
Re: Idiot's guide to a self build battery
So i finally got the JK BMS data, without having to do any additional wiring.
I found a repo, and made some modifications, but largely it works out of the box to retrieve the JK BMS data from bluetooth, and sends it to MQTT which i can read using Home assistant.
if anyone is interested, repo is - https://github.com/schweizp/jkbms_ble.git
I found a repo, and made some modifications, but largely it works out of the box to retrieve the JK BMS data from bluetooth, and sends it to MQTT which i can read using Home assistant.
if anyone is interested, repo is - https://github.com/schweizp/jkbms_ble.git
Re: Idiot's guide to a self build battery
It looks like the DIY battery club will be getting another member...
I've just pulled the trigger on an order of 17 x EVE LF304 cells, plus a 200A (2A active balancing) JK BMS from Colin at Deriy.
I'm going to go with a slightly different setup than the ones I've seen on this thread so far, building a 17s battery instead of the usual 16s.
My inverter is limited to 65A discharge (67A charge) on the battery side, so the Pylontech stack has always maxed out at about 3100w discharge.
Fine for most situations, but sometimes I'd like a little more headroom to eradicate that last grid import for the kettle, etc.
The inverter can charge at 58v, so a 17s setup will see about 3.41v per cell when charging. My research suggests this won't be an issue, it just might take longer to hit near 100% in the CV stage of charging.
The real benefit will be the higher nominal voltage of the battery (54.4v), unlocking an extra 400w or so of discharge when needed. That plus the 16.5kWh of capacity!
Just got to start ordering cables, crimps, etc now.
I've just pulled the trigger on an order of 17 x EVE LF304 cells, plus a 200A (2A active balancing) JK BMS from Colin at Deriy.
I'm going to go with a slightly different setup than the ones I've seen on this thread so far, building a 17s battery instead of the usual 16s.
My inverter is limited to 65A discharge (67A charge) on the battery side, so the Pylontech stack has always maxed out at about 3100w discharge.
Fine for most situations, but sometimes I'd like a little more headroom to eradicate that last grid import for the kettle, etc.
The inverter can charge at 58v, so a 17s setup will see about 3.41v per cell when charging. My research suggests this won't be an issue, it just might take longer to hit near 100% in the CV stage of charging.
The real benefit will be the higher nominal voltage of the battery (54.4v), unlocking an extra 400w or so of discharge when needed. That plus the 16.5kWh of capacity!
Just got to start ordering cables, crimps, etc now.
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
Congratulations, its a great way to expand storage and we all learn as well.MrPablo wrote: ↑Wed Feb 08, 2023 8:01 pm It looks like the DIY battery club will be getting another member...
I've just pulled the trigger on an order of 17 x EVE LF304 cells, plus a 200A (2A active balancing) JK BMS from Colin at Deriy.
I'm going to go with a slightly different setup than the ones I've seen on this thread so far, building a 17s battery instead of the usual 16s.
My inverter is limited to 65A discharge (67A charge) on the battery side, so the Pylontech stack has always maxed out at about 3100w discharge.
Fine for most situations, but sometimes I'd like a little more headroom to eradicate that last grid import for the kettle, etc.
The inverter can charge at 58v, so a 17s setup will see about 3.41v per cell when charging. My research suggests this won't be an issue, it just might take longer to hit near 100% in the CV stage of charging.
The real benefit will be the higher nominal voltage of the battery (54.4v), unlocking an extra 400w or so of discharge when needed. That plus the 16.5kWh of capacity!
Just got to start ordering cables, crimps, etc now.
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
Re: Idiot's guide to a self build battery
@ MrPablo, what are you going to do with your existing Pylontechs ?Joeboy wrote: ↑Wed Feb 08, 2023 8:08 pmCongratulations, its a great way to expand storage and we all learn as well.MrPablo wrote: ↑Wed Feb 08, 2023 8:01 pm It looks like the DIY battery club will be getting another member...
I've just pulled the trigger on an order of 17 x EVE LF304 cells, plus a 200A (2A active balancing) JK BMS from Colin at Deriy.
I'm going to go with a slightly different setup than the ones I've seen on this thread so far, building a 17s battery instead of the usual 16s.
My inverter is limited to 65A discharge (67A charge) on the battery side, so the Pylontech stack has always maxed out at about 3100w discharge.
Fine for most situations, but sometimes I'd like a little more headroom to eradicate that last grid import for the kettle, etc.
The inverter can charge at 58v, so a 17s setup will see about 3.41v per cell when charging. My research suggests this won't be an issue, it just might take longer to hit near 100% in the CV stage of charging.
The real benefit will be the higher nominal voltage of the battery (54.4v), unlocking an extra 400w or so of discharge when needed. That plus the 16.5kWh of capacity!
Just got to start ordering cables, crimps, etc now.
16.9kW PV > 109MWh generated
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
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
I have a friend with 2 x US3000s already, he'll be taking my three once I'm all setup on the DIY stack.
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
Thank you Paul for the supportMrPablo wrote: ↑Wed Feb 08, 2023 8:01 pm It looks like the DIY battery club will be getting another member...
I've just pulled the trigger on an order of 17 x EVE LF304 cells, plus a 200A (2A active balancing) JK BMS from Colin at Deriy.
I'm going to go with a slightly different setup than the ones I've seen on this thread so far, building a 17s battery instead of the usual 16s.
My inverter is limited to 65A discharge (67A charge) on the battery side, so the Pylontech stack has always maxed out at about 3100w discharge.
Fine for most situations, but sometimes I'd like a little more headroom to eradicate that last grid import for the kettle, etc.
The inverter can charge at 58v, so a 17s setup will see about 3.41v per cell when charging. My research suggests this won't be an issue, it just might take longer to hit near 100% in the CV stage of charging.
The real benefit will be the higher nominal voltage of the battery (54.4v), unlocking an extra 400w or so of discharge when needed. That plus the 16.5kWh of capacity!
Just got to start ordering cables, crimps, etc now.
Most customer would go for 15s or 16s
17s is kind of new to us , waiting for the system share when battery arrived
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/