I've been reading Will's posts and watching his vids. In here (re:https://diysolarforum.com/threads/r...e-for-diy-lifepo4-batteries-sticky-post.5101/), he describes the desired charge profile for 12V 4S LiFePO4 Battery w/ BMS as:
Absorption: 14.5V
Float: 13.6V
Inverter Cut-off: 10.7V-12V (depending on size of load and voltage drop etc)
I have 4-BB 100ah batteries (NIB) that will be connected to an AIMS 2500w inverter charger (PICOGLF25W12V120AL) using a 8ft 4/0 welding cable run. They have a built in BMS. I'll be using a generator and shore power to charge the batteries until I can get some solar set up (phase 2 of the project)
Will recommends stopping the charger at 10.7-12v 'depending' but doesn't mention where he's taking that measurement. I've read other posts in here that suggest it should be what the inverter sees, opposed to what the batteries say. He goes on to mention that to extend the live of a 12v battery for 5,000+ Charge Cycle Absorption Recommendation: 12V Battery: 14.1V
The inverter doesn't seem to allow the flexibility needed to follow this advice, or I just don't understand the inverter well enough. It does have a 'Charge Rate' adjustment and I was wondering if I could use that somehow. I'd contact AIMs but they don't answer inquiries, so another lesson learned too late and I'd really hate to try and wing it.
My questions are:
1) Where should the measurement be taken? At the inverter?
2) The inverter only understands volts. If I use @MisterSandals chart, I see 90% 13.3v Can I somehow limit the charge rate and possibly intervene when the measured volts reach the 13.3v?
3) Anyone else have this setup and find away to achieve the desired outcomes mentioned above?
Absorption: 14.5V
Float: 13.6V
Inverter Cut-off: 10.7V-12V (depending on size of load and voltage drop etc)
I have 4-BB 100ah batteries (NIB) that will be connected to an AIMS 2500w inverter charger (PICOGLF25W12V120AL) using a 8ft 4/0 welding cable run. They have a built in BMS. I'll be using a generator and shore power to charge the batteries until I can get some solar set up (phase 2 of the project)
Will recommends stopping the charger at 10.7-12v 'depending' but doesn't mention where he's taking that measurement. I've read other posts in here that suggest it should be what the inverter sees, opposed to what the batteries say. He goes on to mention that to extend the live of a 12v battery for 5,000+ Charge Cycle Absorption Recommendation: 12V Battery: 14.1V
The inverter doesn't seem to allow the flexibility needed to follow this advice, or I just don't understand the inverter well enough. It does have a 'Charge Rate' adjustment and I was wondering if I could use that somehow. I'd contact AIMs but they don't answer inquiries, so another lesson learned too late and I'd really hate to try and wing it.
My questions are:
1) Where should the measurement be taken? At the inverter?
2) The inverter only understands volts. If I use @MisterSandals chart, I see 90% 13.3v Can I somehow limit the charge rate and possibly intervene when the measured volts reach the 13.3v?
3) Anyone else have this setup and find away to achieve the desired outcomes mentioned above?