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Re: Yet another DIY LF280K Storage Battery
Are you doing any thermal monitoring at all?
Re: Yet another DIY LF280K Storage Battery
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Last edited by marshman on Sun Jun 11, 2023 10:29 am, edited 1 time in total.
Re: Yet another DIY LF280K Storage Battery
The "C" level is so ridiculously low for these huuuuuge battery packs that measuring the temperature is largely irrelevant.marshman wrote: ↑Tue Jan 17, 2023 10:42 amThe Daly BMS has a temperature probe which I have "buried" between a couple of cells. Last night the temperature got down to -3 deg C and the stack is sitting at 6 deg C with nothing connected, the Pylon stack, which was charging overnight, only dropped to 10 deg C. Neither have any insulation. So not overly worried, if they are like the Pylontech ones "in use" the temperature doesn't move much.
An EV that charges/discharges at 100kW or more is a whole other KoF.
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: Yet another DIY LF280K Storage Battery
Except for measuring for below zero temps if your batteries are in an area at risk to very low temps.Stinsy wrote: ↑Tue Jan 17, 2023 11:05 amThe "C" level is so ridiculously low for these huuuuuge battery packs that measuring the temperature is largely irrelevant.marshman wrote: ↑Tue Jan 17, 2023 10:42 amThe Daly BMS has a temperature probe which I have "buried" between a couple of cells. Last night the temperature got down to -3 deg C and the stack is sitting at 6 deg C with nothing connected, the Pylon stack, which was charging overnight, only dropped to 10 deg C. Neither have any insulation. So not overly worried, if they are like the Pylontech ones "in use" the temperature doesn't move much.
An EV that charges/discharges at 100kW or more is a whole other KoF.
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: Yet another DIY LF280K Storage Battery
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Last edited by marshman on Sun Jun 11, 2023 10:37 am, edited 1 time in total.
Re: Yet another DIY LF280K Storage Battery
9 degs is as low as I have seen displayed on my bms software and that's with minus 12 outsidemarshman wrote: ↑Tue Jan 17, 2023 12:28 pm Spot on Nowty. I don't think there is any concern about temperature rise due to high rate discharge or charging. The issue is low temperature charging. I am in the soft south "desert" where temps usually only dip below zero over night when the batteries are usually charging so not an issue for me. BUT up t'north it may become an issue if the batteries are in an uninsulated outbuilding.
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: Yet another DIY LF280K Storage Battery
Not bothered about the cells but pylontechs do terminal temp measurements which seems sensible (the amphenol panel mounts have a dimple for it too).Stinsy wrote: ↑Tue Jan 17, 2023 11:05 amThe "C" level is so ridiculously low for these huuuuuge battery packs that measuring the temperature is largely irrelevant.marshman wrote: ↑Tue Jan 17, 2023 10:42 amThe Daly BMS has a temperature probe which I have "buried" between a couple of cells. Last night the temperature got down to -3 deg C and the stack is sitting at 6 deg C with nothing connected, the Pylon stack, which was charging overnight, only dropped to 10 deg C. Neither have any insulation. So not overly worried, if they are like the Pylontech ones "in use" the temperature doesn't move much.
An EV that charges/discharges at 100kW or more is a whole other KoF.
Re: Yet another DIY LF280K Storage Battery
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Last edited by marshman on Sun Jun 11, 2023 10:37 am, edited 1 time in total.
Re: Yet another DIY LF280K Storage Battery
This is by design the 4 AWG chosen by pylon has a 105C (not the more usual 60C) rating and thus suitable for 125A from a US3000C and the like (a pretty typical setup would be 2 units with 74A to make a source).
Re: Yet another DIY LF280K Storage Battery
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Last edited by marshman on Sun Jun 11, 2023 10:37 am, edited 1 time in total.