Posted by Carmody
(here)
Posted by Lazlo
(here)
Posted by pie'n'eal
(here)
Help needed with solar panel -battery.
I bought a 145W 8.15A solar panel, plus a 1000W inverter.
Does anyone know what sort of battery I should use with it?
It seems that ordinary leisure batteries do not like being drained below 50%.
Basically I want it to operate a 240 volt. 100/140 Watt. slow cooker.
Is this possible?
Thanks,
Tony
Doing the math here (P=IV) you have a 17.79V module. You would normally want around 14V to directly charge a 12V battery. The module you have was likely intended to be used in series to operate a grid tied inverter as part of a string operating at higher voltages.
Some basic principles of PV modules. The nameplate is based upon STC = Standard Test conditions. In reality, your module will almost never operate at these conditions. STC is 1000 w/m2 (irradience) and 25 deg c module temperature.
Voltage is dependent upon temperature. Higher temperature = lower voltage and lower temperature = higher voltage
Current is dependent upon irradience. The intensity of the sunlight.
You should be OK with this module but I would suggest that you get a charge controller to keep the voltage optimized for charging and to float when the battery is topped off. I would think that you can find a controller for $30 USD or so if you dig around. I think that someone else mentioned that you will boil off the battery of the voltage is too high.
You are not going to be able to cook much of anything with a single battery system. I'd hate to see you disappointed and disillusioned with PV. I don't think that anyone else has mentioned this. It goes back to Ohm's law. Look at the label on the cooker that you want to use. It will be labeled with how many amps the cooker uses when in operation. I expect that you will find that the battery won't heat the oven long enough to cook anything.
You can PM me and I'll be happy to help you with the math and come up with a solution that you will be happy with given your budget.
Deep cycle batteries are a requirement, and if you don't want to pay too much attention to them, go with a sealed gel style battery. These are sometimes called maintenance free batteries.
Disclaimer: I work with utility scale PV. My plants operate at 600-1000V on the DC side and step up to anywhere between 480 and 320,000V on the AC size and are rated in the MW range. The largest being 146 MWp. It's enough to power a city of around 40,000 people.
I don't spend a lot of time thinking about small systems, but I do understand how the technology works
I found a way to discharge batteries that makes them last notably longer when discharging....and a way to get more power from the panels.
Unloaded vs loaded panels.
If you pulse discharge the panels in the megahertz range, you get a draw curve, over time. Similar to that of a capacitor curve. The drop from no load voltage to load voltage is not instantaneous...
But the return to no load voltage, in the semi conducting material of the panel itself IS instantaneous. Parallel increase at the molecular level on disconnect, molecular series drop and capacitor like time curve on the drop, on draw.
Find the magic frequency..and the power output increases.
One tiny problem. Well, a big problem, potentially.
It may work like a planar (2d) orgone/scalar generator.
Experiment, but watch for it.
If it erupts into an apparent over unity situation, don't be surprised. After all... it is a 'semi' conductor, at the molecular level, and it inherently lives in a state of elastic near resonance.
Think of Tom Bearden's solid state (transistor or 'semiconductor') over-unity experiments and devices. except...on a grand physical 'planar' scale. That's one heck of a lot of semi-conductor material, in a given cell. It would probably have to be tuned for it's physical location, as well. meaning, if it works and is moved and then it doesn't work for some reason, it probably will need to be tuned to the local dark matter situation.
Read posts 182 and 183,and proceed to the link to the layered bismuth aluminum device, and it should be clear, at that point.
https://projectavalon.net/forum4/show...l=1#post576114
Understand that we are talking about inherent dark matter, the dimensional fabric of linear time and 3d reality formation..and interruption of such flow, can create it's own interference pattern, so this may be a dangerous pursuit. Localized distortions, and what not. Remember Tesla's experiments and associated resonance..and what can go wrong. Such a thing is an 'open' system and the effects could be unpredictable, without the correct background knowledge. It could (and probably will) be like sticking a potent resonant reed in a flow system..and the effects are partially unpredictable to the uneducated and unaware person or group.