Lithium Battery Installations
This post is primarily for DIY builders and installers. We have started to see people having a few performance issues with self-installed Lithium batteries.
The same applies to Solar Controllers as for Mains Chargers and DCDC units charging via alternators.
Pretty much the same applies for charge current, I have seen recommended charge rates as low as 20amps, which is roughly equivalent to the peak 300W of solar can deliver or a 20amp mains charger.
Again if you exceed the charge current recommendation, you face shortening battery life and voiding warranty.
Yes, they should have a BMS, but these need to allow for peaks which are usually only for a few seconds, you can’t rely on the BMS, you need to have the appropriate equipment to look after your batteries.
Having said all of that, there are also plenty of Lithium brands that allow a range of charge voltage which by design are the same as most AGM profiles, this has allowed many many owners to do a direct swap out from AGM to Lithium without having to change any other hardware.
If you don’t know your specs, please take the time to look them up and write them on your battery, so if anyone is ever working on them they will know what to check for.
You may need to buy a compatible charger but I can assure you it will be cheaper than replacing your battery prematurely.
One quick example, a recent customer had purchased a common brand mains charger sold at a national vehicle accessory store, it had a Lithium Profile, so was purchased and connected and after a relatively short period, the customer started having issues, upon doing some research the battery was found to have a max charge voltage almost 1/2 a volt lower than the Lithium Profile on the charger, now I can hear some of you saying 1/2 a volt is not much, but I can assure you it is enough to damage SOME batteries, particularly over an extended period.