Stupid battery and solar questions
I figure I am going to have a lot of them, so I better put all in one thread :B. My situation: - I mainly want solar for running residential freezer and fridge, maybe also for charging my shave ...
Forum Discussion
Naio wrote:
My current freezer is an Edgestar medical freezer, 1.8 amps, 65 watts, according to mfr's specs. But an online calculator tells me that 1.8 amps AC is 220 watts. ???
I don't have specs on a second freezer, but online numbers say they are around 3-7 amps, probably 5 amps.
Do I need 4 of these 135aH batteries? More?
8 pages, still guestimating without audit. 1.8A, is it DC? This would be some very small freezer. OTH, 1.8A AC is a bit high.
65W is more in the ballpark, but this is a guesswork. You need to know DC current and cycle.
Assuming 65W, 65/13=5A, without inverter (?? does it need inverter ??)...
Cycle 30%, 50, 80?...
With 60% cycle, 5A*24*0.6 = 72 AH per 24 hours. 36 AH per 12 hours.
Same for the 2nd freezer if (IF) it has same DC current and same volume.
Total 144 AH per 24 hours. Add 10% if it needs inverter, 160 AH daily total.
180 AH a day with other loads (but without any major loads). 3*135 AGM will give you 202 AH usable charge, or 27 hrs with no charging. I wouldn't be feeling comfortable with this.
Another conclusion from this guesstimating is that your solar should be at least 700W for summer and 1,100W for winter.
