Some time ago I designed a project, its for a ups system for light, its not something complex, but i think i will work fine for someone
I hope that works well
Schematic for the charger part
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You can add more from this 1uF capacitors for more current for the charger, but not more then 5 because its dangerous
its about like this 1uF=60mA current
Schematic for the mine part ( the brain
)
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where it says "Napojuvanje Vlez " its the input from the power supply unit
and where it says 'kon invertor +12V" its the output to the inverter part ..
( its on Macedonian
)
Schematic for the main part but for LED's
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Schematic for the inverter
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some oder schematics for addons
battery monitor
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I don't take responsibility if something happens!!