yeahDo you have the link for the solar panel?
Thanks! I would like to know how you did those calculations. Thanks again !If you had the SP , measurements would look something like: Peak power
with a 40 ohm load, V = 15.7 V, I = 370 mA, P = 5.8 W. 12-20- 2009, 12:30 PM, 33 deg. N.
that's true, sadly they're on the most famous shops here.Why do they sell electrical and electronic items with almost no detailed technical spec's?
There are also missing spec's for the battery.
I really needed that! thanks a lot.I found a plot of power vs. time for 15 W panel. Should give an idea of power vs. time even for 5W panel.View attachment 219733
This will change my plans tremendously for the better of course, I'm grateful to know all of that though. Thanks a lot!Well that panel won't charge a 12v lead-acid battery as its 12v out at 430mA with an open circuit voltage of 13.5v and a short-circuit current of approx 600mA so you have no headroom. You really need an 18v output panel for that charge controller as its not a boost converter by all accounts.
The battery is a triple 3mm x 45mm x 110mm pouch cell, 3s1p, nominally 11.1v with internal charge/discharge protection but no balancer. It needs to be charged with a constant current at 0.5A max to 4.2v/cell (12.6v max), then at constant voltage of 12.6v until charge current drops below 30mA. Only then it is fully & safely charged.
Ditch the charge controller, its of no use to you.
You could use the existing panel with a constant current boost converter based on the LT8490 chip, (eg https://wiki.beyondlogic.org/index.php?title=LT8490_MPPT_Buck_Boost_Solar_Regulator - but this isn't a commercial product, and I don't know of one)
Thanks! I will buy some of those charge controllers and give it a go, because I might blow some of them up ( as you saw from my recent posts)The issue just isn't stopping the charging when its done, don't these battery's have certain charging steps. You can make a simple charge controller using just two transistors but its how you charge the battery.
demonstrating a flawed concept is just going to cause you more hassle in the long run. Is the battery pack just 3 18650s?. they do make a solar charge controller for lithium cells. BIG BUT... i have seen a review and apparently the charging protocal isnt good for the batterys long term but may be good for the concept as-long as your idea is a item being used off the batteries to show off the grid capabilities and not claiming you can charge lithium ions from a solar panel.
https://www.amazon.co.uk/Kcnsieou-Controller-Lithium-Battery-Charging/dp/B08G84J1XG
kind regards,
rick
Can I connect the battery to my circuit (load) as it being charged using this controller you mentioned earlier (MPPT kcnsieou controller) like at the same time?they do make a solar charge controller for lithium cells. BIG BUT... i have seen a review and apparently the charging protocal isnt good for the batterys long term but may be good for the concept as-long as your idea is a item being used off the batteries to show off the grid capabilities and not claiming you can charge lithium ions from a solar panel.
https://www.amazon.co.uk/Kcnsieou-Controller-Lithium-Battery-Charging/dp/B08G84J1XG
kind regards,
rick
That wont work, it needs a higher voltage input by 2 - 3 volts than your battery voltage (ideally 18v). Also despite the title its charge profile is for lead acid, it'll ruin your batteries.Can I connect the battery to my circuit (load) as it being charged using this controller you mentioned earlier (MPPT kcnsieou controller) like at the same time?
The link to the battery in the 1st post shows only 12V, 3000Ah and nothing else. It looks like a Li-PO.Is the battery pack just 3 18650s?.
by Jake Hertz
by Duane Benson
by Duane Benson
by Jake Hertz