Hi
I purchased this inverter. The lead acid battery is dead. Is it possible to use a 12v drop in lithium battery on this inverter ?
CPS1000.pdf (6.5 MB)
No idea.
This did pop out:
That may have an impact on the size of Lifepo4 battery.
Was thinking of one of these
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Only potential issue I see is the unknown charge voltage. No details on exact voltages for the charger but spec sheet indicates suitable for gel/AGM batteries which should mean a max “absorption charge” voltage between 14.4V-14.8V.
Unless things changed this is the BlueNova “drop-in replacements” preferred settings
IF the charger applies 14.8V that would mean 3.7V per cell which might shorten the overall life of the cells but it is still below the point where the battery will disconnect. iirc you need to charge these to over 14V for the balancer to work in any case.
The charger does a standard CC/CV/Float charge without any extra high pulse/conditioning stuff that might lead to the battery disconnecting.
The drop-in replacements should be able to handle the max power output of the inverter - the Bluenova should be good for 110A continuous and 160A for 30 seconds.
As TTT pointed out the max charge current of the charger can mean a fairly long recharge time if the battery SOC dropped quite low.
LiveStainable was running a very good deal at one stage. I got one and think it is great (in my camping box).
One thought that always pops up in my mind:
Why do some get an expensive Lifepo4 battery to power a much cheaper inverter, one that one cannot even adjust the charge volts on?
Drop-in-replacements, great idea, but how does one know that the battery will not die prematurely, unknowingly, due to incorrect settings on the inverter?
A BMS can only get one so far.
Same happened in the “old days” with lead acid. Batteries got destroyed prematurely due to cheaper inverters with no “intelligent” chargers.
I’ll leave that thought here.
The inverter was a purchase made for an application that wasn’t critical at the time.
But I learnt that lead acid batteries are just not practical for that purpose.
Now, the lead acid battery has completely died.
The options are
Buy another lead acid
Buy a lithium
Throw everything away and install a residential grade system with batteries and solar.
So I made a poor decision in the beginning and realise that I should have went in big on the initial install.
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Don’t worry, I made plenty of “mistakes” myself.
But like any good “smous”, I sold my “mistakes” on in a “paying-it-forward” fashion.
“Paying-it-forward”, what!?
Dropped my price having made sure that whomever I sold to, I “vetted” each sale that new owner buys the item “fit-for-purpose”.
No need that two people make the same mistake I made.
I’m a nice guy see. 
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Some of these inverters have a little rotary switch somewhere so you can set the voltage for flooded vs AGM, or something like that. The lower setting for AGM will often allow you to use a drop in lithium battery.
Given the cost of those BlueNova drop-ins, these days I’d just tell people to get a Ecoflow or something similar. Lighter, a single device, etc. Put a 12V socket on the old inverter and toss it in the back of the bakkie for when you need it that one time. Or something
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