3nergE
Member
- Joined
- Dec 3, 2016
- Messages
- 97
Hi Everyone, Thought I would share my project with you.
I have also put a link in the youtube section for those who like visuals :http://secondlifestorage.com/viewtopic.php?f=10&t=165
I'm Building my powerwalls using the 4p cradles and 12mm copper pipe as busbars.
Been running for 3-4 Months 250kWh+ output at my place.
About 5-6 Months at my mates place with a little more output than mine.
My mates setup is 4s96p x1 + 4s48p x1 (3v bus bar tie in, so its 4s144p)
1kW of solar panels, 1500w combi-plus CP-1500-122 inverter, xantrex c35 charge controller set to 16v
My setup is 4s48p x 3 (3v bus bar tie in, so its 4s144p)
1.5kW of solar panels, 1500w combi-plus CP-1500-122 inverter, xantrex c60 charge controller set to 16v
The only real shortcoming is the combi-plus inverters will only power on to a max of 16v
The unit can cope with 17.5, but safety margin means 16v is max, pity. But 4v / cell is kind to them.
LVD is set to 12v so the cells dont go below 3v. Bottom end balance down to 2.5v / cell.
No BMS on either rig, but we run meters across all the series so we can see balance at a glance.
Drop in replacement for our aging lead acid banks, and we are totally stoked at the performance and reliability.
I have to say first up that it all looks TOTALLY unsafe, No per cell fusing, wooden backboards, No BMS - its hectic.
But a lot of time has gone into testing cells, balancing and ensuring that everything is under tiny charge input and discharge load.
My mates rig charges at ~20-40A the cells get 138-277mA each during the charge cycle.
My rig charges at ~35-70A and the cells get 243-486mA each during the charge cycle.
Discharge load of 1.5kW is about 100-120A depending on the OCV of the rig at the time, this is about 694-833mA per cell.
I have used cells of around 2500mAh, so they are rated for about 1200-1300mA charge and about 5000mA discharge.
All cells capacity tested by charging up and discharging at 1000mA, so real world performance is better than in testing.
We can pop individual cells out easily, and I am constantly monitoring everything for temp and smell (yes ...)
Its a work in progress, constantly trying to make it better and safer.
I went no solder and cradles as I wanted the ability to pop out a cell and replace it easily.
(not to mention I can't solder very well)
kind regards
I have also put a link in the youtube section for those who like visuals :http://secondlifestorage.com/viewtopic.php?f=10&t=165
I'm Building my powerwalls using the 4p cradles and 12mm copper pipe as busbars.
Been running for 3-4 Months 250kWh+ output at my place.
About 5-6 Months at my mates place with a little more output than mine.
My mates setup is 4s96p x1 + 4s48p x1 (3v bus bar tie in, so its 4s144p)
1kW of solar panels, 1500w combi-plus CP-1500-122 inverter, xantrex c35 charge controller set to 16v
My setup is 4s48p x 3 (3v bus bar tie in, so its 4s144p)
1.5kW of solar panels, 1500w combi-plus CP-1500-122 inverter, xantrex c60 charge controller set to 16v
The only real shortcoming is the combi-plus inverters will only power on to a max of 16v
The unit can cope with 17.5, but safety margin means 16v is max, pity. But 4v / cell is kind to them.
LVD is set to 12v so the cells dont go below 3v. Bottom end balance down to 2.5v / cell.
No BMS on either rig, but we run meters across all the series so we can see balance at a glance.
Drop in replacement for our aging lead acid banks, and we are totally stoked at the performance and reliability.
I have to say first up that it all looks TOTALLY unsafe, No per cell fusing, wooden backboards, No BMS - its hectic.
But a lot of time has gone into testing cells, balancing and ensuring that everything is under tiny charge input and discharge load.
My mates rig charges at ~20-40A the cells get 138-277mA each during the charge cycle.
My rig charges at ~35-70A and the cells get 243-486mA each during the charge cycle.
Discharge load of 1.5kW is about 100-120A depending on the OCV of the rig at the time, this is about 694-833mA per cell.
I have used cells of around 2500mAh, so they are rated for about 1200-1300mA charge and about 5000mA discharge.
All cells capacity tested by charging up and discharging at 1000mA, so real world performance is better than in testing.
We can pop individual cells out easily, and I am constantly monitoring everything for temp and smell (yes ...)
Its a work in progress, constantly trying to make it better and safer.
I went no solder and cradles as I wanted the ability to pop out a cell and replace it easily.
(not to mention I can't solder very well)
kind regards