wa8yxm wrote:
Modified sine wave: Long list of things that do not play nice with it. Can generate major Radio Frequency interference affecting nearby Radios, Televisions, Sat Receivers and audio ampolifers
Filtered modified sine wave: Same list of things that do not play nice.. Filtering greatly reduces the radio frequency interference in some cases to the point where it drops below the "noise floor" and is thus undetectable (good thing).
True Sine Wave.. Very very short list of things that do not play nice (Entier list: Anything needing more power than it can produce) Very little if any Radio Frequency Interference.. Very clean power. often better than commercial power.
Batteries: 2 pair of Trojan T-105 or equal is minimum for a 2KW inverter
You have 220 Amp Hours times about 10 for Watt hours there, or 2,200 watt hours
Fridge is about 100-300 watts depending on model. that's 10 hours max if your wiring is perfect and you are lucky.
This is reduced by other loads (Explosive gas detector for example) and increased by Fridge's "Down time" (when nothing is running)
Page 3: Many have run Compressor type (residential) fridges on MSW and no problem... However the manufacturers say "Do not"... Me.. I prefer the absorption fridge cause I can run it on very little 12 VDC plus a tank of Propane if I have to.. and sometimes.. i ahve to.
Has anyone looked at the filtered MSW inverter output waveform on an oscilloscope? Depending on the cutoff frequency and the number of poles of the low pass (or bandpass)filter it could be a pretty decent waveform meaning the 2nd and higher order harmonics are attenuated significantly. If however the filtering is only removing much higher (past the 5th harmonic) frequency components such as switching noise then it will probably not act much different than other MSW inverters.
