emmsee
New member
- Joined
- Jun 18, 2017
- Messages
- 8
First post and thought I'd jump right in.
I'm starting on a small project after spending about 70 hours (I'm retired) watching Adam Welsh, Jehuand HBPowerwall YouTube videos.
As I said small steps but with a view to a powerwall to power a caravan (trailer to our left hand drive friends).
We are Grey Nomads (Australian for spending most of our year on the road travelling this fantastic country) and I think a Powerwall in a 'van is feasible.
I use about100 amp hours a day from a 12 volt system, but would be only restricted to 12 voltsat output phase; aim to run my wall at or about 24 volt.
I have 500 watts of 24 volt PV's charging 960 ah of AGM deep cycles presently (ouch - 280KG of lead), and will needto replace them in the next 12 months.
Currentthinking is LiFePo cells but I like the idea of utilising 18650's.
We go off grid about 5/6 days a week with 1 to 2 days on grid power to use luxuries like AC.
Has anyone ventured down this path?
Is there a spreadsheet or online facility that assists in calculating the number of 7s 18650 cells I'd need to meet my power needs?
Now to my small existing project.
We have 2 mobiles, one tablet, 2 laptops, a Paperwhite and a charger for 18650 flashlight usethat currently add to my 100 ah draw from my AGM's and I'd like to switch that draw to 1 or 2 x 8 cell 18650 power banks. Not all get used or need charging daily.
I can access about 40 18650's from power tool battery packs and presently have 2 x 8 slot power banks.
My MPPT controller has a USB load output.
Could I just connect my powerwalls one a a time to that output for charging?
What about balancing?
Any advise would be appreciated?
cheers
emmsee
I'm starting on a small project after spending about 70 hours (I'm retired) watching Adam Welsh, Jehuand HBPowerwall YouTube videos.
As I said small steps but with a view to a powerwall to power a caravan (trailer to our left hand drive friends).
We are Grey Nomads (Australian for spending most of our year on the road travelling this fantastic country) and I think a Powerwall in a 'van is feasible.
I use about100 amp hours a day from a 12 volt system, but would be only restricted to 12 voltsat output phase; aim to run my wall at or about 24 volt.
I have 500 watts of 24 volt PV's charging 960 ah of AGM deep cycles presently (ouch - 280KG of lead), and will needto replace them in the next 12 months.
Currentthinking is LiFePo cells but I like the idea of utilising 18650's.
We go off grid about 5/6 days a week with 1 to 2 days on grid power to use luxuries like AC.
Has anyone ventured down this path?
Is there a spreadsheet or online facility that assists in calculating the number of 7s 18650 cells I'd need to meet my power needs?
Now to my small existing project.
We have 2 mobiles, one tablet, 2 laptops, a Paperwhite and a charger for 18650 flashlight usethat currently add to my 100 ah draw from my AGM's and I'd like to switch that draw to 1 or 2 x 8 cell 18650 power banks. Not all get used or need charging daily.
I can access about 40 18650's from power tool battery packs and presently have 2 x 8 slot power banks.
My MPPT controller has a USB load output.
Could I just connect my powerwalls one a a time to that output for charging?
What about balancing?
Any advise would be appreciated?
cheers
emmsee