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My LogicPower 12V LPM-PSW-1500VA (1050W) UPS was very noisy, I slightly modified the cooling system, the inverter has been working for almost a year in the apartment, you can sleep near it. For my needs, this conversion fully justifies itself, I think this is how all similar inverters can be modified. TZT DC 12V PWM Speed Controller Fan Speed Governor Bought here: Speed Control Board https://s.click.aliexpress.com/e/_DdK... 1 Fan https://s.click.aliexpress.com/e/_DkZ ... 2 Fan https://s.click.aliexpress.com/e/_DFR... Thermometer https://s.click.aliexpress.com/e/_Deh... LiFePO4 3.2V cells https:// s.click.aliexpress.com/e/_DFX... 1 LiFePO4 battery https://s.click.aliexpress.com/e/_DeI... 2 LiFePO4 battery https://s.click.aliexpress.com/ e/_Dmk...