Say the battery is 40 Amp-hours and the load uses 5A. If the solar panels are recharging the battery at 2A, do I have enough info to find out how long the batter will last? If not, what more would I need?
It depends on the application
You will draw 5 Amps for how many hours per day?
You will get 2 amps for how many hours per day?
For each hour of operation at 5A you will need (5/2) = 2.5 hours of sun.
Hope this properly answers your question
Assuming all voltages are the same, you’d be draining the battery at 5 -2 = 3 A.
Assuming the battery starts off fully charged, 40 Ah / 3A = 13 hours and 20 minutes, approx.
Of course, the discharge curve won’t be so discrete, but for a first approximation, this will work.
If i am using a 12v 12W solar panel to charge a 12v deep cycle battery, and a 12v load connected parallel to the battery,
My problem is, how to make the load ‘work’ or discharge the battery through the load when the sun is below the battery voltage, what shall i need to connect here? a relay? SPDT relay? anyone can guide on this?
Meaning if the solar panel is getting voltages above the battery (means it is charging the battery), they load will not work , and
when the solar panel is getting voltage lower than the battery, the battery will start to discharge through the load. So what component can switch this circuit?
pls email to me, if you have the answer to my doubts, thanks.
It depends on the application
You will draw 5 Amps for how many hours per day?
You will get 2 amps for how many hours per day?
For each hour of operation at 5A you will need (5/2) = 2.5 hours of sun.
Hope this properly answers your question
Assuming all voltages are the same, you’d be draining the battery at 5 -2 = 3 A.
Assuming the battery starts off fully charged, 40 Ah / 3A = 13 hours and 20 minutes, approx.
Of course, the discharge curve won’t be so discrete, but for a first approximation, this will work.
Hi,
If i am using a 12v 12W solar panel to charge a 12v deep cycle battery, and a 12v load connected parallel to the battery,
My problem is, how to make the load ‘work’ or discharge the battery through the load when the sun is below the battery voltage, what shall i need to connect here? a relay? SPDT relay? anyone can guide on this?
Meaning if the solar panel is getting voltages above the battery (means it is charging the battery), they load will not work , and
when the solar panel is getting voltage lower than the battery, the battery will start to discharge through the load. So what component can switch this circuit?
pls email to me, if you have the answer to my doubts, thanks.