Can a 1500W Pure Sine Wave Inverter Work Safely With 12V 120Ah Lithium Ion Battery?

Hello, i got an 1500watt pure sine wave inverter with shutdown voltage to 10V and Overcharge 15V.My battery is 12v 120ah lithium ion battery. The battery cuts off at 9v with 11.1v nominal voltage. Now the guy that i bought the inverter from says it can't work with lithium ion batteries. Now is that true? Cause i know inverters can work with any type of batteries. Now the reasoning behind that is the lead acid has different over voltage and under voltage from lithium ion. Now please i just want to know if this is true or no and why. Thank you everyone.

Ari, you don't say if your inverter is a charger as well, you do specify overcharge voltage in the first line so maybe it is?  If this is the case then the guy you bought the inverter from is right, you should not use Li batteries with it.  This will depend on the exact battery you have, but let's assume that it has 3 cells of the usual LI-ion batteries.  The nominal terminal voltage will then be 3 x 3.6V or 10.8 V (it will have plenty of charge left at this voltage whereas a lead-acid battery will be discharged.  At maximum charging voltage your LI battery will have 4.2 x 3 = 12.6.  Most Lead Acid chargers will charge to 13.2 volts or more.  Do this with your Li battery and you risk an explosion.  You may have a different chemistry battery with values of 3 and 3.6V and 4 cells  giving values of 12.0 and 14.4V which would be safer..... but I wouldn't risk it.  Most lithium multi-cell chargers have an equalising circuit that prevents one cell form charging over the maximum voltage (there are ICs specifically designed for this).  So treating them as Lead Acid batteries for charging is taking a big risk.
If you can get hold of a data sheet for your battery or even contact the manufacturer you'd be in a better place to decide on this, but my advice would be - DON"T - unless you are sure that (a) your charger limits the maximum voltage to that of your battery and (b) your battery has cell-by-cell protection against overcharging.  There are so many types of Lithium battery that you need to know exactly what you are dealing with.

Ari sorry, just reread your post and you confirm your battery is 11.1 nominal (that's 3 cells at 3.7 volts) and cutoff at 9v (that's 3 x 3V).  so don't even think of using it with this inverter.  Quite apart from the main danger (overcharging and pyrotechnic displays)  with a cutoff of 10V your inverter would cut off while the batteries are still above their nominal cutoff voltage.  The cutoff is not a big problem, it will prevent the batteries deep discharging (which is not good for Li Batteries).  IF you are using a separate (and correct) charger for your battery, and the inverter does not also try and charge the batteries, you'd be OK.  But from your post this is not the case, the inverter will try and charge the battery as a lead acid type.  If that's the case, don't even think about it!

Hello, thank you very much for your reply. I am planning to use a separate charger for lithium ion batteries which is compatible with that cause they were bundled together when i bought the battery. So will ti be ok with a separate charger? 

Hello, thank you very much for your reply. I am planning to use a separate charger for lithium ion batteries which is compatible with that cause they were bundled together when i bought the battery. So will ti be ok with a separate charger?

Ali - of course if you are using a separate (and purpose-designed) charger it will be fine.  Just be very sure that your inverter is just an inverter and that it does NOT charge the batteries at all.  The inverter shut down voltage that you quote is a bit high for your LI battery, but that is a good thing - although it will not fully discharge it, Li Batteries don't like full discharges so you win there.  Certainly try it and see how it goes, but please make sure your inverter does not try and charge your lithium battery.

Make sure that the inverter isn't also trying to charge the battery while you are too. Also, the inverter may be monitoring the battery status and providing charge-remaining (etc) which will be different. Watch out for starting surge currents (some lead acids can tolerate a large discharge surge, since there isn't usually protection circuits in the pack like there is in lithium packs). If the lithium pack has discharge-surge protection, it could get in the way. Lead acids tend to allow float charging (always charges with a small current after reaching full charge), which isn't allowed on lithium.  Some lithium packs are specifically designed with circuitry, that make them form/fit/function lead-acid replacement, which just drop in (I assume this is NOT your case). This floating would need to be disabled depending on how you run the unit. If the battery is removed or disconnected for charging, then good, as long as the battery isn't connected while the mains are driving the battery. You might post how you intend to do this hookup and operation, since it can make/break your success.

Hello, thank you for your reply. I putted a little scheme to tell how i am planning to use it. And i also checked the datasheet of the inverter and i don't think there is a charger included with inverter so i don't think it has also charging capabilities. Also i was thinking about also putting a switching board so when  the charger its plugged into the outlet inverter would ran via electricity. Also below i included the datasheet of the inverter so you can take a look and make sure if it also chargers the batteries.(Also inverter dosen't the port for the charger.)
IMAGE: https://imgur.com/a/1hvnJDatasheet Inverter: https://imgur.com/a/zXH2b

Hello, thank you for your reply. I putted a little scheme to tell how i am planning to use it. And i also checked the datasheet of the inverter and i don't think there is a charger included with inverter so i don't think it has also charging capabilities. Also i was thinking about also putting a switching board so when  the charger its plugged into the outlet inverter would ran via electricity. Also below i included the datasheet of the inverter so you can take a look and make sure if it also chargers the batteries.(Also inverter dosen't have the port for the charger.)
IMAGE: https://imgur.com/a/1hvnJDatasheet Inverter: https://imgur.com/a/zXH2b

Thanks for that Ivan - Ari, Ivan knows more than me about batteries so he's come up with some extra stuff to watch for.    From what I can see you should be good, though that's a big inverter (1000W) and Ivan's comments about starting surge could be a problem.   You'd certainly have nothing to lose by trying it out.  Let us know how you go.

Hello Ivan, thank you for your reply. Please can tell me if there is anything wrong with what i am planning to do. I putted a little scheme to tell how i am planning to use it. And i also checked the datasheet of the inverter and i don't think there is a charger included with inverter so i don't think it has also charging capabilities. Also i was thinking about also putting a switching board so when  the charger its plugged into the outlet inverter would ran via electricity. Also below i included the datasheet of the inverter so you can take a look and make sure if it also chargers the batteries.(Also inverter dosen't the port for the charger.)
IMAGE: https://imgur.com/a/1hvnJDatasheet Inverter: https://imgur.com/a/zXH2b