Author Topic: Lithium LFP/whizbang charge efficiency  (Read 1350 times)

SolarMusher

  • Sr. Member
  • ****
  • Posts: 488
    • Solaire Laurentides
Lithium LFP/whizbang charge efficiency
« on: April 10, 2022, 01:41:23 PM »
Hi all,
I was tweaking my Whizbang efficiency to match my Volthium LFP batteries and noted that 98% was too low on WBjr and Trimetric, so I set them both to 100% and SOC seems to be more accurate.
What WBjr numbers are you using on different LFP batteries?
100% seems too good to be true but...
Thanks,
Erik
Off Grid with 4kw PV | 2x Classic 200/WBjr | 2x Outback VFX3648 Epanel | 3x SPD300 + 1x Schneider HEPD80 | Hub + Mate + PSX-240 | Volthium 400Ah/51.2V LFP battery bank + Trimetric | 1500 watts AC water heater | Kubota 11kw GL diesel generator

boB

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4014
Re: Lithium LFP/whizbang charge efficiency
« Reply #1 on: April 10, 2022, 10:14:53 PM »

I would love to hear what others say about their findings too...

Thanks for your information !   I knew that the Amp-Hour efficiency was higher for LFP than Lead Acid but, WoW !

boB
K7IQ 🌛  He/She/Me

SolarMusher

  • Sr. Member
  • ****
  • Posts: 488
    • Solaire Laurentides
Re: Lithium LFP/whizbang charge efficiency
« Reply #2 on: April 11, 2022, 07:40:56 AM »
Hi boB,
Volthium told me to start with 98% efficiency, but after four/five cloudly days my Wbjr plus Trimetric were both off by 6%.
I set them to 100% yesterday and will check them for a week.
Another option would be to install a Cerbo gx from Victron to read the SOC directly from batteries. The Cerbo has two relays that could be used to start a gen on soc.
Simpliphi integration guides for Outback (fndc) talk about 98% efficiency but I would be curious to know real life numbers from different LFP users/brands.
A+,
Erik
Off Grid with 4kw PV | 2x Classic 200/WBjr | 2x Outback VFX3648 Epanel | 3x SPD300 + 1x Schneider HEPD80 | Hub + Mate + PSX-240 | Volthium 400Ah/51.2V LFP battery bank + Trimetric | 1500 watts AC water heater | Kubota 11kw GL diesel generator

FNG

  • Administrator
  • Sr. Member
  • *****
  • Posts: 431
Re: Lithium LFP/whizbang charge efficiency
« Reply #3 on: April 11, 2022, 08:01:45 AM »
I have my Battleborns set to 99% on my Victron shunt seems pretty close

SolarMusher

  • Sr. Member
  • ****
  • Posts: 488
    • Solaire Laurentides
Re: Lithium LFP/whizbang charge efficiency
« Reply #4 on: April 11, 2022, 10:53:29 AM »
Hi FNG,
Do you have a Victron BMV battery monitor?
Off Grid with 4kw PV | 2x Classic 200/WBjr | 2x Outback VFX3648 Epanel | 3x SPD300 + 1x Schneider HEPD80 | Hub + Mate + PSX-240 | Volthium 400Ah/51.2V LFP battery bank + Trimetric | 1500 watts AC water heater | Kubota 11kw GL diesel generator

FNG

  • Administrator
  • Sr. Member
  • *****
  • Posts: 431
Re: Lithium LFP/whizbang charge efficiency
« Reply #5 on: April 15, 2022, 06:48:13 AM »
Hi FNG,
Do you have a Victron BMV battery monitor?

I do yes