silverse2m6
Member
- Joined
- Jun 16, 2017
- Messages
- 93
Hello,
After reading a lot of good information I decided to start project #1/5: to outfit our 5th wheel camper RV with 4x165W PV panels and 2S2P lead acide batteries for 208Ah of usable 12V. The system was designed to be self sustainable up to 1500W continuous draw (mainly to be able to use A/C and microwave albeit not at same time).
This project is done and b/c of the weight of the setup, I discovered the 18650 wonder cells.
So project #2/5 was born, equip my off the grid workshop with PVs and a Powerwall. Today it's using a 9kW gas generator to power power tools, battery chargers etc. The workshop is a ~40x40 portable class room with full HVAC (albeit not central HVAC) and 240V input mains.
The plan is:
Build a solar powered battery as cheap as possible (while learning in order to move onto the house project)
I want to be able to pull continuously 7.5kW (30 amp on 240V) circuit inside for HVAC, the panel is rated up to 200A.
Recharging will be via solar PV panels. I only spend about 4 hours a week, if that. I may spend up to 3 hours at once but most time I only average 2 hours. Capacity is therefore more important, and recharging time is less of an issue.
So far I have purchased ~1100 cells out of which ~600 have been tested with only 2 being bad and maybe 40 more salvageable. The average capacity as measured on a 1A charge/draw with Opus4S is around 2150mA. For now I plan on sticking with 4S 12V system (although 7S like Pete's seems very appealing).
I'm building 80P modules which will be arranged in 4S packs. I plan on using 3 such 4S80P packs for a total of 980 cells. Im not certain on which inverter to use although there's a nice used 8k SMA unit on eBay that's 10 yo but functionning.
Continuing to use the genset would obviously be the cheapest way to go but if I keep the project scalable and transferable I should be able to move the setup to the house. What issues do you foresee with this plan?
Alex
After reading a lot of good information I decided to start project #1/5: to outfit our 5th wheel camper RV with 4x165W PV panels and 2S2P lead acide batteries for 208Ah of usable 12V. The system was designed to be self sustainable up to 1500W continuous draw (mainly to be able to use A/C and microwave albeit not at same time).
This project is done and b/c of the weight of the setup, I discovered the 18650 wonder cells.
So project #2/5 was born, equip my off the grid workshop with PVs and a Powerwall. Today it's using a 9kW gas generator to power power tools, battery chargers etc. The workshop is a ~40x40 portable class room with full HVAC (albeit not central HVAC) and 240V input mains.
The plan is:
Build a solar powered battery as cheap as possible (while learning in order to move onto the house project)
I want to be able to pull continuously 7.5kW (30 amp on 240V) circuit inside for HVAC, the panel is rated up to 200A.
Recharging will be via solar PV panels. I only spend about 4 hours a week, if that. I may spend up to 3 hours at once but most time I only average 2 hours. Capacity is therefore more important, and recharging time is less of an issue.
So far I have purchased ~1100 cells out of which ~600 have been tested with only 2 being bad and maybe 40 more salvageable. The average capacity as measured on a 1A charge/draw with Opus4S is around 2150mA. For now I plan on sticking with 4S 12V system (although 7S like Pete's seems very appealing).
I'm building 80P modules which will be arranged in 4S packs. I plan on using 3 such 4S80P packs for a total of 980 cells. Im not certain on which inverter to use although there's a nice used 8k SMA unit on eBay that's 10 yo but functionning.
Continuing to use the genset would obviously be the cheapest way to go but if I keep the project scalable and transferable I should be able to move the setup to the house. What issues do you foresee with this plan?
Alex