Zwy
Emperor Of Solar
10K sq foot house.That's why systems like this exist ?
I think it's under powered.
10K sq foot house.That's why systems like this exist ?
Lol. That's just the offgrid system. They had a "whole nother" grid tied system not even shown10K sq foot house.
I think it's under powered.
the spreadsheet is a little difficult to decipher but with engineering and solar panels and racking, it looks like I end up spending more to go grid tied than to go off grid
That's funny because I was wondering the opposite- why not just one transformer? Most large loads are 240v so I wonder what large 120v loads they plan to power
Btw the inverters don't appear to have a grid connection. Just battery and pv
I cycle lightly, the larger bank makes up for charging to 95% or less, I go just over 3.4V when charging in order to engage balancing.Your calculation for batteries is $0.0264/kWh. My rough number was $0.05/kWh. That changes the PV panel to battery calculation a bit.
Most commercial battery systems are much more expensive, but DIY with cells and server rack batteries might reach this range.
All based on manufacturer's claimed cycles. There are a few forum members with actual experience of high cycle life. Many more with failure?
Tests have not shown many manufacturers reaching claimed life. Those were operated around 1C continuously, so results may be better with our gentle cycling.
Are LFP prices artificially high?
Cost is irrelevant to sale price. market value is king. profit drawn from building, marketing, future sale reduction pricing, etc. I would be EXTREMELY surprised if sales were anywhere close to material and labor and manufacturing costs... It's like the cannabis market. It costs MAYBE $50 to...diysolarforum.com
I don't like putting a lot of money into chemistry that degrades with time.
Electronics, I think main degradation mechanism comes from electrolytic capacitors and semiconductors, both strongly affected by temperature.
I have some experience with electronics still operating decades later.
Fans, of course, need replacement. I just ordered a 24V fan for VFD that I've had for 20 years.
For grid-backup batteries I went with AGM 3 years ago. 1/5th the cost of lithium (that I knew about) for 1/5th the cycle life.
If I get pushed onto NEM 3.0 I'll consider changing that system to LiFePO4 and moving the AGM to another system on NEM 2.0
Meaning you can only stuff 1.37 kWh into grid and put out of grid each day, on average, for 500 kWh of yearly storage?
Or, the grid has "only" 500 kWh capacity you can use (e.g. bank in the summer to use in winter)?
At 4 days per cycle, 2500 cycles will take 27 years. Some lithium batteries indicate 30 year design life.
Your avoiding frequent full charge should help.
Do they stay at moderate temperature? Consider A/C if needed.
Also maybe some way to monitor for hot connections (BMS detecting cell divergence might do.)
I imagined PTC fuses stuck on every terminal, connected in series with contactor.
One guy wired a smoke alarm in his battery room to shut system off, although that didn't stop a failure in his case.
I have a well, powered entirely by my solar system. If my pump goes out, I could always go to the neighbors 150 feet away and get water from their well.Electricity we can live without. Water we can't. Do you have a tank, to get by when well pump is out of service?
(I should set up a tank, but I do have a pool.)
I can't even imagine living in a 10k sq foot house. My house is 4k sq feet and have had people get lost in it. The grandkids and their cousins like playing marco polo. They would need hand held radios in a 10k sq foot house.10K sq foot house.
I think it's under powered.
That's what I thought, until the end of the video. lolBtw the inverters don't appear to have a grid connection. Just battery and pv
35% greater panel cost but 200% greater mounting hardware?
Differences between the two proposed systems.
Is there an analysis of your consumption to support battery size?
$6000 could be 3 or 4 server rack batteries, 15kWh to 20kWh.
I forgot about kitchen loads lolThe Growatt transformers have some switching trying to make the 240V inverter + auto-transformer + grid work together.
It's pretty easy to exceed 2500W or 5000W of 120V load. A house has many 120V circuits and appliances. Dishwasher, clothes washer, garbage disposer, coffee pot, microwave, hair dryer, refrigerator's defroster & ice maker ...
How's he feeding a 230v only inverter from us grid. Isn't that supposed to create a dead short?That's what I thought, until the end of the video. lol
Not a short. But N/G bonding issues. And possibly grid balancing issues.How's he feeding a 230v only inverter from us grid. Isn't that supposed to create a dead short?
Ok. I like that system if there is no grid connectionNot a short. But N/G bonding issues. And possibly grid balancing issues.
It's pretty close to what I will have. If I ever get it finished. lolOk. I like that system if there is no grid connection
What are you waiting on lol.It's pretty close to what I will have. If I ever get it finished. lol
I had a forced week of no electricity or running water during the ice storm here in Texas. We were burning whatever random stuff we could find for warmth and to heat food. Since then, mine is more tolerant of tom foolery when it comes to electricity generation.I was told I can do whatever I want, as long as when she hits the on button it turns on. WAF Wife Acceptance Factor lol
If I had known about just charging the battery with something like a chargeverter and not connecting the grid to the inverter I probably would have gone this route. Or bought one of those deyes that was in the classified section a while backIt's pretty close to what I will have. If I ever get it finished. lol
At any time, the bank is limited to 500Kwh. You can produce it in summer and use it in winter. Most grid tie around here is at 47 degrees and the snow sits on panels for weeks at a time. Most report the bank is used up mid January.
If I use 1500 a month and self consume 750 during solar hours then to zero out my bill I would need battery capacity for 750kwh in the month or about 25kwh a day. So that's where I get my $6000 30kwh diy bank.
Sounds like net metering is worthwhile then. Cheaper than a battery. Just can't supply 100% of your winter power. Is that resistance heating, or heat pump?
My bank can power my house for 4 days easily if we cut usage to a minimum without any PV input. This is the smart way of handling PV power, on sunny days the bank gets built up and depleted on days with hardly any yield. The bank can handle that.For a single day's use, you may not need to store a day's use in battery. Just one night's use.
Would that be about 1/3 of 25kWh? Or more? Maybe you only need 8kW ~ 10kW to get by when the grid is down. Not including winter heat. Run well pump when battery is full, filling a tank.
Grid would make that practical, taking care of days without sun.
My usable capacity of battery is close to 1 hour's effective sun. It should make it through the night powering my inefficient old refrigerators, but only if not powering yard lights and an old tube amplifier.
I use about 50kwh a day but about half of that is when the sun is shining so I don't need to store that in batteries but I could store the other half. I don't have to of course, I could also use less battery and offset less of my consumption. I still have a few months of data to gather before I make the final decisionFor a single day's use, you may not need to store a day's use in battery. Just one night's use.
Would that be about 1/3 of 25kWh? Or more? Maybe you only need 8kW ~ 10kW to get by when the grid is down. Not including winter heat. Run well pump when battery is full, filling a tank.
Grid would make that practical, taking care of days without sun.
My usable capacity of battery is close to 1 hour's effective sun. It should make it through the night powering my inefficient old refrigerators, but only if not powering yard lights and an old tube amplifier.