I4 Battery/Alternator Charging Behavior...batteries shutting off, dying, car not starting, etc.
- Thread starter Kaz
- Start date
That’s pretty low, not much left in reserve at that point. How much capacity is claimed on your battery?
Says 0-3. But even after 2 weeks it’s the same voltage and still starts up fine.
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Sitting for 2wks and starting fine honestly seems good enough already. Most ppl that drive their car regularly wouldn't have an issue. Those that drive their car less than once in 2 weeks likely have it on a tender.
Now im reaaallly tempted, I dont park next to any accessible outlet, so tender is not an option for me, 27lb savings without startup issues seems pretty godsent to me.
Now im reaaallly tempted, I dont park next to any accessible outlet, so tender is not an option for me, 27lb savings without startup issues seems pretty godsent to me.
- Thread starter
- #85
couple days of report on the OHMMU Sodium battery:
nothing really to report, last night saw resting voltage of 12.7, alternator is charging the battery while driving normally (around 13.5-14v) and now after driving the battery is at 12.8V - I'm headed out of town for a while and will plug it into a Victron charger that is user programmable for float, charge, etc. I'd say it's safe to purchase and use it just acts like a normal battery -
nothing really to report, last night saw resting voltage of 12.7, alternator is charging the battery while driving normally (around 13.5-14v) and now after driving the battery is at 12.8V - I'm headed out of town for a while and will plug it into a Victron charger that is user programmable for float, charge, etc. I'd say it's safe to purchase and use it just acts like a normal battery -
For those going with this Sodium cell battery, there is a preferred trickle charger. I was going to use my Optimate trickle charger I had for previous Antigravity LiPO batteries but I decided to make sure using Grok.
Ok, so which trickle charger to get?
Ordered off Amazon, there were other online options for maybe $20 cheaper but didn't know what shipping costs or time frame to receive it was so i just ordered off Amazon and it was delivered next day!
Ok, so which trickle charger to get?
Ordered off Amazon, there were other online options for maybe $20 cheaper but didn't know what shipping costs or time frame to receive it was so i just ordered off Amazon and it was delivered next day!
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The stock OEM trickle charger weighs in at 1.5 lbs. whereas the Victron weighs in at a beefy 4.5 lbs. So we lose 3 lbs savings from the 28 lb reduction from swapping OEM to Ohmmu batteries. But it's still a good net 25 lb weight reduction.
There is no simple plug and play quick disconnect for the Victron as it has hardwired O ring terminal connectors. You can clip the O rings off and splice magnetic quick disconnect but it voids the Victron warranty.
So like the OEM Lotus trickle charger, I'm just going to leave it in the trunk.
There is no simple plug and play quick disconnect for the Victron as it has hardwired O ring terminal connectors. You can clip the O rings off and splice magnetic quick disconnect but it voids the Victron warranty.
So like the OEM Lotus trickle charger, I'm just going to leave it in the trunk.
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So with a 4.5lb brick in the trunk, how are you planning on not letting it be a flying missile with your aggressive G force driving you might ask?
There is a M6×50 bolt under the trunk liner that attaches the boot to the subframe. Poke a hole thru the trunk liner and swap out a longer M6 bolt to a 60mm and anchor that 4.5lb brick to the trunk floor. Solid! No movement.
There is a M6×50 bolt under the trunk liner that attaches the boot to the subframe. Poke a hole thru the trunk liner and swap out a longer M6 bolt to a 60mm and anchor that 4.5lb brick to the trunk floor. Solid! No movement.
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You can monitor and control the trickle settings through the Victron app on your phone. In custom profile, you can adjust settings recommended by Grok specifically for this Ohmmu battery.
Floating at 14.6V
I decided to leave the Antigravity battery monitor connected as well, probably redundant but good real-time data while driving. Correlates with Victron app with voltage float at 14.6V.
Floating at 14.6V
I decided to leave the Antigravity battery monitor connected as well, probably redundant but good real-time data while driving. Correlates with Victron app with voltage float at 14.6V.
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I don’t think that’s good advice. There is no reason to bring a sodium ion battery that high in voltage. The LFP figure of 14.4V is 3.6V/cell and that is ample to reach full charge on a sodium ion battery. Absorption voltage is for lead acid as far as I understand, it’s not relevant to LFP or Sodium Ion.
These cells need a regular CCCV charge curve, the precise CV voltage is not critical for Sodium Ion, but certainly anything 14V or a little higher will have you at full charge or close to it. Also, there is no reason why you need to maintain a full charge, so long as a moderately high charge is maintained, then the battery will have no problem starting the car.
For info, you can actually discharge sodium ion cells completely to 0V. They will not be damaged and can be recovered to normal function again by charging. However, there will be some form of BMS in these batteries (I’d expect), that should disconnect the discharge when it reaches a certain LVC (cell level, low voltage cut).
These batteries still have useful energy even to low (no load) voltages, certainly down to 10 or 11V or even lower (but not sure how the BMS LVC has been configured). Could maybe ask the supplier for the battery specs, including LVC, hvc, max charge/discharge trip current.
Yea I’m pretty sure my ancel BmS is not set correctly. I am using lead acid profile. The battery voltage was 11.42v after 3 weeks but SOC was reporting 0% which I guess makes sense for lead acid batteries.
Right, 11.4V is about 0% for Lead Acid, but not for NA (sodium ion). The ancel device is just a monitor I expect, whereas a BMS (battery management system) will monitor voltage, current and temperature and has the ability to isolate the battery from the external load and/or charger, as well as balance the cells (equalize the cell voltages). This 12V battery has 4 series cell groups.
- Thread starter
- #95
I ordered the same charger as docron did but didnt have the chance to set it up before I left on a long trip. I did connect up my Antigravity charger in lithium mode per OHMMU's advice and it worked perfectly - they did say the are releasing their own sodium charger with bluetooth soon so that's something to consider later too.
The battery just works like a stock battery, car went through lots of start stops, different lengths of time unplugged, etc. worked perfectly nothing to report.
The battery just works like a stock battery, car went through lots of start stops, different lengths of time unplugged, etc. worked perfectly nothing to report.
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