Kings Lithium Battery Capacity Test - After 5 Months Of Heavy Use

[@joelhiggs9056]

Great video mate, very informative.. well done legend 👌

[@TheSimpleLivingAussie]

Thanks mate

[@TradieTrev]

You know you're gear mate! I wish I could ask the same for all of my clients.

[@TheSimpleLivingAussie]

lol, thanks mate

[@FleurMann-b3d]

What are your thoughts on bms drawing enough current to drift the shunt that far?

[@TheSimpleLivingAussie]

@@FleurMann-b3d I think it is in my setting, I will have to have a play around with them and see how it goes.

[@MiniLuv-1984]

I've got a kings 60AH running in parallel with two well used, 100AH AGM's to power a water pump now for over 6 months and so far perfect.

[@TheSimpleLivingAussie]

?? is the Lithium battery in the same circuit as the AGM batteries ?? Although it will kinda work, it will be drawing from the Lithium battery until the voltage drops, then it will start drawing from the AGM's. Not a good battery combination but if it works, then I guess worth experimenting with it.

[@MiniLuv-1984]

@@TheSimpleLivingAussie Yes, they are all in parallel. It works well using a programable charger. The AGM's are almost always fully charged and the LiFePO4 varies between 20% (12.8V) and 100% (13.8V) while the AGMs go between 75% and 100% SOC. (Because I can set the charge start and charge stop voltage on the charger).

[@67hr74]

Hi Glen, I didnt think 12v Lipo4 liked being connected in series. Quite a lot of suppliers say so, ok to wire in parallel, though. I have been known to be wrong though😅. Quite a lot of info on that brand when you delve into them..

[@griffinsgarage2023]

it depends on what type of BMS the battery is running. The mosfets in the BMS need to be ablle to handle the higher voltage. There are many BMS'S that can handles up to 60v no problem. but some of the cheaper ones cant.

[@67hr74]

@@griffinsgarage2023 Thanks for that info 👍

[@TheSimpleLivingAussie]

Yeah these Kings 120Ah batteries can series up to 48 volt but the older 100Ah Kings batteries could only stay at 12 volt due to the voltage limitations of the BMS. Now-a-days with off grid power becoming more popular, you see more LFP battery manufacturers using BMS's that can handle higher voltages.

[@67hr74]

@TheSimpleLivingAussie thanks, I did follow your link and go have a look @ them. Cheers.

[@Solar-42]

I've had my 2 Kings 120Ah in series about 18 months cycling around 40-50% daily keeping essential IT and eBikes charged. I don't bother testing them just note the typical charge required to get them to 100% is around 1.8kWh per day from a 1kW peak array. So far 1100kWh since a regulator reset last year. Might do a discharge test if I get time. Trouble free so far.

[@TheSimpleLivingAussie]

I have been very impressed with these batteries so far. I have had questionable experiences with Kings gear in the past, but I think they have upped their game a bit and coming out with some half decent quality for the price.

[@wholle0]

Great information Glen great video. What is the warranty period for those batteries?

[@TheSimpleLivingAussie]

They have a two year warranty. They also advertise as only having 2000 cycles to 80% which is well under the industry standard of 5,000 cycles to 80%. I am guessing maybe due to the cell grades however for the price that is still pretty good. au.adventurekings.com/120ah-lithium-battery.html

[@arthur3578]

Looking good. I hope they last as long or better than your old lead acid batteries

[@TheSimpleLivingAussie]

They should do. Kings advertise as only having 2000 cycles to 80% which is well under the industry standard of 5,000 cycles to 80%. So I am not sure on the grade of cells they are using. However I found I use to get around 3 years out of 120 Ah AGM batteries before experiencing major performance losses, that is just over 1,000 cycles. So if the Kings Lithium's get twice that I will be happy for the price those batteries are, not to mention the power performances Lithium gives compared to AGM.

[@MiniLuv-1984]

@@TheSimpleLivingAussie When their time has come, I've found AGM's capacity falls off a cliff but the LiFePO4's gradually lose capacity.

[@FleurMann-b3d]

Have you got your solar charge controller power out running through your shunt? If not you will get that result on your shunt due to parasitic draw, same thing happened to me. Took a while to work out what was going on

[@TheSimpleLivingAussie]

yeah everything runs through the shunt.

[@FleurMann-b3d]

Great setup, there needs to be a logical reason why it has drifted that far out within 5 months. Perhaps because you are post bms on both batteries? There would be some loss there. Depending on bms you could be loosing up to 6ma on each battery which would work out to be about 42 amp loss over 5 months.

[@craigtomkinson2837]

Lovely Ep and test,

[@TheSimpleLivingAussie]

Thanks mate

[@philg2468]

So your shunt says 80%. What voltage have you entered in the Shunt settings? This is the voltage at which the shunt recalibrates to 100% - I set mine at 14.1V for 12V system but expect you'd want yours set to 28.2V or therabouts?

[@TheSimpleLivingAussie]

28.8 if I remember, maybe I drop it a little. I have my 48 volt system set to 56 and it calibrates fine which will be equivalent to 28 on my 24 volt system. So I will set it to 28 and see how it goes.