Hi all. Merry Xmas and all that. So I have a solar setup for my camping. Am running a small fridge. I have a wee problem, one I am going to resolve. But this is it, and hey, any better ideas from the community would be cool.
Current setup is a 96AH deep cycle battery, 5 panels each giving on average 3-4A at 12VDC. My 120w fridge, when plugged in used approx 0.202kwh measured on the 230vac side over the space of approx 6 hours. I was curious how efficient it would be. Anyway. This is not my problem.
My problem is, my inverter. Pure sinewave inverter is 2500W. Chinese. Cheap. Too large infact as well. It is drawing a full 1.6A full time. Over the space of night time, even without the fridge plugged in the inverter actually drains a reasonable amount of power. Now, unless the battery is at full charge and full capacity when the sun goes down, if I leave the fridge plugged in, when the fridge starts, for the split second of inrush start current, it is enough to beep the inverters alarm. Wakes everyone up. I just dont like it.
Out of all the obvious solutions, replace the inverter, turn it off at night, etc etc.
I am thinking I might like to control the inverter, on/off function by plugging into the fridge thermostat circuit. Ya know? Fridge drops below temp, click, turns on the inverter which in turn supplies power to the compressor, magic evaporation thing happens, cold fridge. Less of valuable power lost. No beep waking everyone up in the tent. Happy children. Happy wife....
But before I do this. Anyone know if the thermostat in a modern fridge needs live constant 230vac to operate or is it a mechanical type which will switch on/off by mechanical means only. I can determine this by checking it out but if someone knows, please let me know.
The rest I can sort. I have a bunch of different voltage SSrs. Although, I dont know if I should install a short delay between firing up the inverter and the compressor. Or just simultaneous. I dont think my fridge likes it even with a small voltage drop, and the inverter seems to start at 220vac momentarily before settling at 230vac..... Although I guess thats not too bad.
Current setup is a 96AH deep cycle battery, 5 panels each giving on average 3-4A at 12VDC. My 120w fridge, when plugged in used approx 0.202kwh measured on the 230vac side over the space of approx 6 hours. I was curious how efficient it would be. Anyway. This is not my problem.
My problem is, my inverter. Pure sinewave inverter is 2500W. Chinese. Cheap. Too large infact as well. It is drawing a full 1.6A full time. Over the space of night time, even without the fridge plugged in the inverter actually drains a reasonable amount of power. Now, unless the battery is at full charge and full capacity when the sun goes down, if I leave the fridge plugged in, when the fridge starts, for the split second of inrush start current, it is enough to beep the inverters alarm. Wakes everyone up. I just dont like it.
Out of all the obvious solutions, replace the inverter, turn it off at night, etc etc.
I am thinking I might like to control the inverter, on/off function by plugging into the fridge thermostat circuit. Ya know? Fridge drops below temp, click, turns on the inverter which in turn supplies power to the compressor, magic evaporation thing happens, cold fridge. Less of valuable power lost. No beep waking everyone up in the tent. Happy children. Happy wife....
But before I do this. Anyone know if the thermostat in a modern fridge needs live constant 230vac to operate or is it a mechanical type which will switch on/off by mechanical means only. I can determine this by checking it out but if someone knows, please let me know.
The rest I can sort. I have a bunch of different voltage SSrs. Although, I dont know if I should install a short delay between firing up the inverter and the compressor. Or just simultaneous. I dont think my fridge likes it even with a small voltage drop, and the inverter seems to start at 220vac momentarily before settling at 230vac..... Although I guess thats not too bad.