Are you charging your battery direct from solar panel or using a secret SCC?with a 100W solar panel and 100Ah 12V lead battery.
Just for your info, my experience with a 100W solar panel and 100Ah 12V lead battery.
That just runs an internet router drawing no more than 6W.
I bought a new battery on Sept 3.
After 5 days of cloudy weather since Sept. 26., I am close to a dead battery.
Are you charging your battery direct from solar panel or using a secret SCC?
I am powering the router directly with 12v, anything else would have been stupid.Are you powering the router directly with 12V, or are you inverting it?
I am sorry about this but isn't it somewhat to be expected? A 12V 100Ah lead-acid battery can store approx. 600 Watthours (assuming 50% DoD). Powering a 6W router for five consecutive days requires 6W * 5 * 24h = 720 Wh. This means that at least a 120 Wh charge needs to be supplied by the panels during this period to assist the battery.
I think that if you wish the system to deliver sustained power to your router for cloudy periods of similar length, you either have to upgrade to a larger capacity lead-acid battery or change to a LiFePo battery system with the same nominal capacity but a higher DOD.
I have made several tests with different solar controllers. Currently I have a "pseudo-MPPT" SCC in operation, operating a buck converter with an adjustable operation point. That was the best compromise between efficiency and low quiescent current.Are you charging your battery direct from solar panel or using a secret SCC?
The chart data is coming from my own battery power monitor, independent of the SCC.This is an excellent question, and I do wish I could read the chart provided; however, I have to believe that charting data is coming from a fancy SCC...
Have a look at the better chart below. The blue power line (with the axis on the right) is the power balance from/to the battery. One needs at least ~6W from the panel to become positive.You must have had attrocious weather to not get any watts out of the panel to leave you in the situation where your battery was done after approx 5 days, that or some critical piece of information is not being told that is already limiting your power production. Even in heavy cloud I'd expect to get 1/10th of the panel's rating out of it. My own experience is that a 100W panel is quite sufficient to hold up a wifi router in my area and it can be cloudy here for weeks.
Care to provide any details of what went on?
2020-09-21T22:00:01.377Z | 2.13 | 12.72 |
2020-09-22T22:00:01.623Z | 1.79 | 12.72 |
2020-09-23T22:00:00.971Z | -0.13 | 12.70 |
2020-09-24T22:00:01.108Z | 1.54 | 12.60 |
2020-09-25T22:00:01.767Z | 0.14 | 12.69 |
2020-09-26T22:00:01.755Z | -5.86 | 12.59 |
2020-09-27T22:00:01.513Z | -4.11 | 12.47 |
2020-09-28T22:00:01.526Z | -8.45 | 12.41 |
2020-09-29T22:00:00.792Z | -9.56 | 12.26 |
2020-09-30T22:00:01.818Z | -1.31 | 12.07 |
2020-10-01T22:00:01.151Z | -7.11 | 12.04 |
2020-10-02T22:00:01.873Z | -4.15 | 11.87 |
Sum | -35.09 |
| |
What is your watt output from your psedo controller during good sun? I have something similar I made and It is lackluster to say the least. Not to say that yours couldn't be way better than mine but I was surprised how poorly my buck converter did from the solar panels compared to powering with a power supply set to same voltage and amps panel was supposed to produce.I have made several tests with different solar controllers. Currently I have a "pseudo-MPPT" SCC in operation, operating a buck converter with an adjustable operation point. That was the best compromise between efficiency and low quiescent current.
Under cloudy weather conditions (where it matters) and for that panel size, the MPPTs were not really better than PWM modules, most of them even worse, since they swallow too much power for themselves.