Lithium Battery Question
I am thinking about converting my 2020 lance to Lithium batteries. I want to do it as inexpensively as possible. (Battle Born ain't gonna happen) Can anyone tell me what specifications I should look f...
Forum Discussion
Well, here’s what I did:
1) While in the boost mode (via PD 9245 charge wizard), I brought the 200a/hr LiFePO4 up to what I’ve been able to establish is it’s maximum holding voltage of 14.2v (charger still on), meaning no off-on again cycling of the BMS (cell balancing), and zero current to battery, and with no other 12v loads in the camper...
2) SOC meter was showing only 91.7% charge (11.0 a/hr to full), despite the fact that it had been freshly synchronized at the start of the previous usage cycle (indicating a passive drift I suppose).
3) Unable to defeat boost mode via Charge Wizard (timer driven), so I switched off PD breaker.
4) Synchronized the LinkLite SOC meter (a shunt based meter), battery now resting at 13.6v.
5) Began with a 10a dc load - within 3 min. voltage drops to 13.5v
6) Voltage drops to 13.4v by 3.5 min.
7) Voltage drops to 13.3v by 6.5 min.
8) Voltage drops to 13.2v by 11.5 min - meter reads 2.8a a/hrs consumed....This is where the curve ends and the flattened plateau begins - 97.2% SOC...
FWIW, from previous testing using roughly twice the load (a 21 dc amp motor load) at approx this same reference point, and then the air cond (via inverter - 80 dc running amps), the voltage would be 13.1v, and 12.9 respectively, and for a longer time run (again with the 21a dc motor), battery voltage dropped off from 13.1v to 13.0v at about 85% SOC.
The listed ‘nominal voltage’ for the battery is 12.8v, but this correspond more with a partially discharged battery or when running the air cond)... Voltage measurement was taken via Linklite metering and confirmed using a hand held VOM at the battery...
My goal here was to focus onlyon the high end as (due to solar) I never take the battery to below about half of it’s capacity
1) While in the boost mode (via PD 9245 charge wizard), I brought the 200a/hr LiFePO4 up to what I’ve been able to establish is it’s maximum holding voltage of 14.2v (charger still on), meaning no off-on again cycling of the BMS (cell balancing), and zero current to battery, and with no other 12v loads in the camper...
2) SOC meter was showing only 91.7% charge (11.0 a/hr to full), despite the fact that it had been freshly synchronized at the start of the previous usage cycle (indicating a passive drift I suppose).
3) Unable to defeat boost mode via Charge Wizard (timer driven), so I switched off PD breaker.
4) Synchronized the LinkLite SOC meter (a shunt based meter), battery now resting at 13.6v.
5) Began with a 10a dc load - within 3 min. voltage drops to 13.5v
6) Voltage drops to 13.4v by 3.5 min.
7) Voltage drops to 13.3v by 6.5 min.
8) Voltage drops to 13.2v by 11.5 min - meter reads 2.8a a/hrs consumed....This is where the curve ends and the flattened plateau begins - 97.2% SOC...
FWIW, from previous testing using roughly twice the load (a 21 dc amp motor load) at approx this same reference point, and then the air cond (via inverter - 80 dc running amps), the voltage would be 13.1v, and 12.9 respectively, and for a longer time run (again with the 21a dc motor), battery voltage dropped off from 13.1v to 13.0v at about 85% SOC.
The listed ‘nominal voltage’ for the battery is 12.8v, but this correspond more with a partially discharged battery or when running the air cond)... Voltage measurement was taken via Linklite metering and confirmed using a hand held VOM at the battery...
My goal here was to focus onlyon the high end as (due to solar) I never take the battery to below about half of it’s capacity
