Will the pwm run the inverter or will spikes damage it
I have 2 6v batts in series, but to extend the run time, I would like to use 3 batts in series for 18v . Using off grid to run a small fridge 120vac .087 ampsIf it is all designed right the answers will be yes and no. If it is not then you will end up with maybe and yes. It's going to take a lot more information. I just clicked on here in hopes of learning something. Good luck
Can I smooth out the pwm voltageDisagree. Raw PWM will run a heater or incandescent bulb as is it were running from a constant voltage at the input x the duty cycle since the load is purely resistive and the total power delivered is all that is important. It will also run a motor because it is inductive.
An inverter is an electronic circuit that would require a constant voltage to run correctly.
You would need either an inverter designed for 18V or a buck converter in between.
Bob
Ok, here's what I have, 6 6v batts, 3 60w solar panels, batts 220ah. At the present i have 3 sets of 12, each on 1 solar panel. I rotate a set each time I go to the cabin, every week or two, that way, I have fresh batts each time. It seem that I don't. Have enough sun for the weekend I their.Yes, that is what a buck converter does. You would be better off to get two more batteries and make a series parallel 12V battery.
Bob
Yes, that is what a buck converter does. You would be better off to get two more batteries and make a series parallel 12V battery.
Bob
Oh by the way. Thank you for helping me. I'm 71 years old and just playing around try to stay off grid for fun, know little about electronics. The only thing I want is to run a very small fridge only from converter. ThanksOk, here's what I have, 6 6v batts, 3 60w solar panels, batts 220ah. At the present i have 3 sets of 12, each on 1 solar panel. I rotate a set each time I go to the cabin, every week or two, that way, I have fresh batts each time. It seem that I don't. Have enough sun for the weekend I their.
PWM is what Buck Converters run on. Well, not necessarily PWM, but they DO change DC into AC, boost or drop the voltage, then convert back to DC. However, overall wattage remains the same. 18 volts at 1 amp is 18 watts. Convert that down to 12 volts and you get 1.5 amps. 12 volts times 1.5 amps equals 18 watts. And THAT is in a PERFECT world. Anytime you convert you give up something due to inefficiencies. Like BobTPH said - you're better off increasing the capacity of the power supply rather than increasing the voltage. Higher voltage means more heat lost due to those inefficiencies mentioned.Will the pwm run the inverter or will spikes damage it
Yes. Buck converters do a fairly good job of it on their own, but you CAN enhance the smoothing with a large capacitor. But there again you run into inefficiency losses. The more you condition a signal the more you give up. There's a trade-off between what you give up and what you achieve.Can I smooth out the pwm voltage
OK, you have SIX 6V 220Ah batteries and you're setting them up in sets of THREE batteries? Each on one solar panel? Are you saying you have three PV Panels? Why not combine them all. Take three sets of two batteries (two six volt batteries in series) (make three sets of them) Connect the sets in parallel. Use all three PV Panels in parallel to charge the batteries all the time. Then you have as much power as you're capable of capturing. No need for switching out batteries every time you go. If configured the way suggested you can have 660 Ah available. Depending on how heavily you use them you'll either make it through the weekend or possibly not. Using an inverter is going to waste some of that available power.have, 6 6v batts, 3 60w solar panels, batts 220ah. At the present i have 3 sets of 12, each on 1 solar panel. I rotate a set each time I go to the cabin, every week or two, that way, I have fresh batts each time.
That is an absorption fridge that will use 7.5amps at 12vOK, you have SIX 6V 220Ah batteries and you're setting them up in sets of THREE batteries? Each on one solar panel? Are you saying you have three PV Panels? Why not combine them all. Take three sets of two batteries (two six volt batteries in series) (make three sets of them) Connect the sets in parallel. Use all three PV Panels in parallel to charge the batteries all the time. Then you have as much power as you're capable of capturing. No need for switching out batteries every time you go. If configured the way suggested you can have 660 Ah available. Depending on how heavily you use them you'll either make it through the weekend or possibly not. Using an inverter is going to waste some of that available power.
Instead of an inverter - get a 12 volt fridge. They make them. Here is one now. $300 US
by Aaron Carman
by Duane Benson
by Aaron Carman