Hello all,
I have sleep apnea and require a CPAP to sleep at night. I have a power cord which goes from my CPAP to a wall outlet. This works great. However, I have started camping with my friends this recent year and I am unable to bring my CPAP with me on said trips. I want to create a battery operated adapter which can power my CPAP roughly 6-7 hours. I looked at the power cord converter and it takes wall power AC (120V I believe) and converts it to 12V @ 5A. I've been looking around and found that alkaline D batteries have a 12-18 Ah battery life (http://en.wikipedia.org/wiki/D_battery). They output at 1.5 Volts. I understand that putting batteries in series increases the voltage, meaning 2 batteries will give me 3 Volts. Therefore, if I put 8 D batteries in series, that gives me the 12 Volts I am looking for. I believe this to work, but I can only get ~3 hours of battery life. I could put 2 stings of 12V D batteries in series to get 24-36 Ah out, but that seems extremely inefficient and it will only give me 5-7 hours of operation. Does anyone have a better solution?
Thanks,
Matt
I have sleep apnea and require a CPAP to sleep at night. I have a power cord which goes from my CPAP to a wall outlet. This works great. However, I have started camping with my friends this recent year and I am unable to bring my CPAP with me on said trips. I want to create a battery operated adapter which can power my CPAP roughly 6-7 hours. I looked at the power cord converter and it takes wall power AC (120V I believe) and converts it to 12V @ 5A. I've been looking around and found that alkaline D batteries have a 12-18 Ah battery life (http://en.wikipedia.org/wiki/D_battery). They output at 1.5 Volts. I understand that putting batteries in series increases the voltage, meaning 2 batteries will give me 3 Volts. Therefore, if I put 8 D batteries in series, that gives me the 12 Volts I am looking for. I believe this to work, but I can only get ~3 hours of battery life. I could put 2 stings of 12V D batteries in series to get 24-36 Ah out, but that seems extremely inefficient and it will only give me 5-7 hours of operation. Does anyone have a better solution?
Thanks,
Matt