I bought a 115W (24V) solar panel from Ebay
Also an MPPT charge controller (the 20A black and yellow one with the LCD screen)
and 2 x 105AHr batteries in parallel (they were new from a store).
And a 1000W pure sine wave inverter
By my math I should have around 1260 Whr of power - figure on using the batteries to 50%
I converted a chest freezer to a fridge after reading some posts about the great efficiency and how to implement an external Johnson Controls thermostat set around 35-38F.
As a freezer, the unit has a rating of 172KWHr per year, which should factor to about 470WHr per day. Even though I am running as a fridge, I am taking the conservative measurement of freezer numbers.
Strange behavior so far: At the end of every day, the batteries are basically dead (11.7V or less), even when we arrive at the cabin and everything is topped up (>13.1V).
All voltages checked on my inverter display, and my MPPT controller display and also verified by a hand held reader.
OK, so you would say that either the fridge is sucking way more power than I figured or I just have bad batteries right?
But the really weird part is that by the next afternoon (4pm or so) all the readings are back up to 12.4-12.5 volts!
Which tells me that I am back to almost 50% battery capacity, even though I only have one 115W panel !
How is this possible, and do you have any advice for me to try this weekend ?
THANK YOU
Also an MPPT charge controller (the 20A black and yellow one with the LCD screen)
and 2 x 105AHr batteries in parallel (they were new from a store).
And a 1000W pure sine wave inverter
By my math I should have around 1260 Whr of power - figure on using the batteries to 50%
I converted a chest freezer to a fridge after reading some posts about the great efficiency and how to implement an external Johnson Controls thermostat set around 35-38F.
As a freezer, the unit has a rating of 172KWHr per year, which should factor to about 470WHr per day. Even though I am running as a fridge, I am taking the conservative measurement of freezer numbers.
Strange behavior so far: At the end of every day, the batteries are basically dead (11.7V or less), even when we arrive at the cabin and everything is topped up (>13.1V).
All voltages checked on my inverter display, and my MPPT controller display and also verified by a hand held reader.
OK, so you would say that either the fridge is sucking way more power than I figured or I just have bad batteries right?
But the really weird part is that by the next afternoon (4pm or so) all the readings are back up to 12.4-12.5 volts!
Which tells me that I am back to almost 50% battery capacity, even though I only have one 115W panel !
How is this possible, and do you have any advice for me to try this weekend ?
THANK YOU
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