Don't say it never happens..Keep a fire extinguisher handy and sleep easy.. Have fun Y'all.
Possible Reasons for Fire in Inverter/UPS
1. Low quality Batteries with broken or non-ceramic fume filters are more likely to catch fire.
2. Input voltage fluctuation my cause internal component failure in the long run and result in MOSFET blast.
3. Inverter with Low Quality base in Printed Circuit Board (PCB) and Undersized tracks may create short circuit and lead to fire.
4. High Room temperature and Dumb inverter that gives constant high charge current even at 40°C temperature.
5. Inverter with Low quality Internal relay & no auto cutoff function when using excess load.
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# Say No to low quality batteries
https://www.youtube.com/watch?v=ZTjpmepMmBo