Steve Farmer wrote:I'm confused about the hype around this.
You can already buy lead acid or Li-ion batteries for around 20-25% of the per KWh price of this tesla pack.
I've been trying to find out the warranty details. Both are warranted for ten yrs. The 7KWh pack for "daily use" the 10KWh pack for weekly use.
If Tesla has made a Li-ion pack that really can go thru 3650+ recharge cycles then I am impressed.
I wonder, and it's only a guess in lieu of them publishing much detail on their warranty, if they expect to be replacing batteries in the pack under warranty well before ten yrs are up but the 4-5x overpricing is going to cover this, especially assuming that many/most customers won't cycle the pack every day and that costs to tesla will fall over the ten years.
Austin Laureski wrote:I wanted to run the system by you all before buying the rest of the components. First I'm building an off grid system. I already have 12 x 255 watt Canadian panels for a total of 3000w. In the future I want to add another 1500w. I want to build a 48v battery bank. I don't know my power needs yet but currently we use about 300kW to 600kw a month with normal living on grid which includes the a/c in the summer. For the offgrid house I want to add a 12v system for lights off the 48v bank using a step down converter or by another charge controller to a 12v battery.
Here's what I want to get let me know if it will work or if it's just not going to work right.
8 x Trojan t 105
Midnight Classic 150
Conext XW+ 5548 By Schneider
Golf Cart DC Converter 48V to 12V Step Down from China
That's what I am thinking so far what do you think
Samuel Morton wrote:Good evening everyone,
This is my first post and forgive any ignorance regarding my electrical knowledge.
I am thinking of buying some solar panels for my shed roof which I hope will power (not full time but as and when said appliances are needed) a LED lighting strip and a small water pump to help me wash my produce (and maybe a blender and phone charger).
The solar panel system I am looking to buy is 10watt 12 volts and I was just wondering about the following things:
- what appliances could this power?
- if this solar set-up can power a 10watt appliance for 100hours (for example) would a 20 watt appliance be able to be used and would last 50 hours with this set-up?
- if I buy two systems and have two batteries and connect these together will I then have 20watts and 24volts?
- Will 1 panel take twice as long to charge two batteries and would two panels charge a single battery twice as fast?
Thanks for getting back to me,
Charles Tarnard wrote:Everything said above is correct, so if you understand those posts but not this post, then ignore this post.
Voltage is a measure of potential, or differential. With each 12v cell you have a difference of 12v from terminal to terminal.
When you put the terminals in series, you are increasing the differential from the most negative point to the most positive point (in other words, adding them up). In this case the cell with the lowest current capacity (the panel with the least sunlight, the battery that is weakest) limits the whole set in amount of current they can deliver.
When you put the cells in parallel, all the positive terminals are on the same point and all the negative terminals are on the same point so the difference across all the cells has to be the same as the difference across any one cell. In this case each cell can deliver current across the terminals in the same way so current capacity can be added up.
Hope that wasn't totally confusing.
chad duncan wrote:
You lose less power to the resistance in the wires when you run at higher voltages.
C. Hunter wrote:(but google is giving me too much crap to find the info I need after 20 minutes of sorting advertising from info.)
Can someone explain the whole why of wiring panels in parallel vs series? I've been watching the solarhomestead videos and he's got his set up in series (I think?) and I know that's something to do with 12v vs higher voltage, correct?
Trying to learn all the things. Think my head may explode.
Karen Crane wrote:
Is there a way to have both?
When there is no power, I would want the well pump to still work along with the fridge.
Karen Crane wrote:YES YES...need this resource!
I have no clue about what is a watt, Ohm or anything but want to get off the grid.
Would be interested in making solar panels as it is much cheaper I've heard.
No clue on how to do it.
No one seemd to be addressing theproblem when the batteries wear out.
What happens to all that acid that is inside?
Can the batteries be "rehabbed"? Or do they need to get dumped at some point?
Just saw something about making electricity with wood?
Would this be any better? Could have a big wood lot with sustainaboe wood growing and ise that as it recycles itself.
Anyone know anything about wood to make electricity?
Markus Loeffler wrote:Hi,
I am looking for a solid and reliable 24VDC MSW inverter for 120V outputting 1000W. I own a PowerBright 24V, 900W inverter which does a very good job but I recently recommended that same model to 2 friends and they both had a very bad experience: one was bad out of the box and the other died after a week of usage. So either there is a quality control issue or they did a new revision of the circuit board.
Any suggestions on good inverters?