ng.sa
Member
- Joined
- Apr 4, 2017
- Messages
- 92
G'Day Guys
I have more than 10 portable power packs Tesla Model X 2170s - 24V 7s2p ( Max. 29.2V when charged via 240V mains initially ) No BMS that I have been testing to find optimum charging, mainly concerned with high and low marks, MTBF, Total Cycles, Virtual Cycles and a few other very obscure settings.
I'm now looking at charging via solar panels, these packs have powerwalls, so I can easily remove the 2170s and test re-charging via mains or cig. socket to charger in car on long trips. In Oz long trips are like 2K to WA from SA ( before .cn virus ) so bottom to top of country.
I have learnt via experience and reading on forums like these to stay well within high and low water marks, so usually < 28V > 23V so a 5V swing on discharge.
So I have really kid gloved these cells and they have never been left outside the house or vehicle so never very hot or cold, 2170s are new not recycled.
Some of the things I have tried / changed
- Quality wire
- Short cable run < 40cm from charge controller to LIBs
- Spraying water on rear of panels to remove heat
- Cleaning panels sometimes 2-3 times a day
- LIBs and charge controller always in shade
- Adjust angle of panel hourly
- Diff. panels, getting slowly bigger, most recently 350W, I have only used 1 panel because I want to mount on a vehicle
I cannot get these packs to 'fully' charge within a 'solar' day.
So I'm wondering, what can I do to improve charging performance via solar panels ?
TIA
I have more than 10 portable power packs Tesla Model X 2170s - 24V 7s2p ( Max. 29.2V when charged via 240V mains initially ) No BMS that I have been testing to find optimum charging, mainly concerned with high and low marks, MTBF, Total Cycles, Virtual Cycles and a few other very obscure settings.
I'm now looking at charging via solar panels, these packs have powerwalls, so I can easily remove the 2170s and test re-charging via mains or cig. socket to charger in car on long trips. In Oz long trips are like 2K to WA from SA ( before .cn virus ) so bottom to top of country.
I have learnt via experience and reading on forums like these to stay well within high and low water marks, so usually < 28V > 23V so a 5V swing on discharge.
So I have really kid gloved these cells and they have never been left outside the house or vehicle so never very hot or cold, 2170s are new not recycled.
Some of the things I have tried / changed
- Quality wire
- Short cable run < 40cm from charge controller to LIBs
- Spraying water on rear of panels to remove heat
- Cleaning panels sometimes 2-3 times a day
- LIBs and charge controller always in shade
- Adjust angle of panel hourly
- Diff. panels, getting slowly bigger, most recently 350W, I have only used 1 panel because I want to mount on a vehicle
I cannot get these packs to 'fully' charge within a 'solar' day.
So I'm wondering, what can I do to improve charging performance via solar panels ?
TIA