diy solar

diy solar

Abusing free nights electricity plan with batteries

bobby3605

bobby3605

New Member
Joined
Jul 13, 2024
Messages
5
Location
Texas
I live in Texas, and one of the energy companies I can choose from is TXU energy. They have a plan where you get 100% free energy from 8pm to 4:59am. During the day the cost is 29.6 c/kwh, so I'd never want to use power during the day.
EFL: https://residential.txu.com/Handler...ype=EnergyFactsLabel&custClass=3&tdsp=CENTERP
I've been brainstorming about designing a battery backup system that can fill up during the night for free, then discharge during the day, so I'd have 100% free power (minus a $10/month base charge).
Assuming a power usage of 2000kwh/month, that works out to 67kwh per day. So I'd need to charge a 67kwh battery pack every night. 67kwh/day is way overkill, but I'm just brainstorming, so I'm trying to see what a theoretical reasonable maximum of the system would look like.
Also, that 67kwh is for a full 24 hours, but I only need batteries to last from 5am - 8pm. However, I'll leave it at 67kwh for brainstorming.
The battery I'm currently brainstorming with is the EVE MB30. https://www.alibaba.com/product-det...fferlist.topad_classic.d_title.87aa458eANU1mh
67kwh over 12 hours means the inverter needs to be able to sustain 5.583kwh, not too bad.
The inverter I'm currently brainstorming with is the Schneider Conext XW PRO 6.8KW. https://signaturesolar.com/schneider-conext-xw-pro-6-8kw-inverter-charger-48v-120-240v/
It can charge the batteries at 48v 120A on 120vac, so it can charge 67kwh in about 11.6 hours, which is barely within the 12 hour free nights window.
The inverter is a bit expensive, I don't know if there's a cheaper one that will work for this.
The payback period I've currently calculated is 3.2 years, and that's with an overkill amount of batteries.
I'd appreciate any feedback on this idea.
All of this would also be contingent on the power company not refusing to renew my contract after a year, or kicking me off even sooner than that. I didn't read anything in the fine print about banning this kind of usage.
I may be able to get the federal tax credit for this, so that's 30% off the price. Battery shipping will increase the price, and so will miscellaneous things like cables, battery BMS, and battery case.

EDIT:
Here is the spreadsheet I used for my calculations. https://docs.google.com/spreadsheet...mZqEpd6nbbDKSrW7RShEYtWl6QY8A/pub?output=xlsx
 
Last edited:
The tax credit should apply fine. Batteries qualify without solar.

Your inverter has to be sized for peak load not average. I would cut the batteries down to max daytime usage in the summer and beef up the inverter to cover all the A/C plus baseline usage. It might help to put the water heater on a timer to only run at night to avoid that coming on during full A/C. Smart thermostats that could preco the house several degrees in the AM could also help some, and are cheap, and useful in other ways. I would definitely use an inverter that could allow the grid to supplement peak usage, either as pass through the inverter (like a solark 15k) or in parallel with grid (feeding back to main panel).
 
I would not consider an xw pro for this.

You need an inverter that can connect to main panel and feed from battery to main panel to zero out what you are buying from the grid. This your of inverters has CTs the attach to main point of entry and monitors power coming from our going to the grid.When the inverter is maxing out it's output, any overage will still come from the grid.

This is a very simple way to do this but you would need an interconnection agreement as there will be some small amounts of backfeed.

Set up your time of use to be on grid and charge from battery during free hours, and switch to battery during daytime hours.
 
My Sungold 10KW SPH10048P SRNE clone was built for this EXACT purpose looking at the settings built into it.

You tell it what time range to use the batteries so it will run them while powers not free and switch to the grid and charge them back up when power is free. Can do 120amps charging from the grid or 200 amps total charging with solar added.
 
What you are asking for is a big order.

200 amp service is about 24 kWh of inverters, as it sounds you want to put your entire house on your critical loads panel. You can only have 80 kWh of batteries. The cells you linked for batteries are not UL approved and this may or may not be a factor.

Need to plan this for your worst month, which for me is summer. I use around six times more electricity in summer than winter.
 
chrisski said:
What you are asking for is a big order.

200 amp service is about 24 kWh of inverters, as it sounds you want to put your entire house on your critical loads panel. You can only have 80 kWh of batteries. The cells you linked for batteries are not UL approved and this may or may not be a factor.

Need to plan this for your worst month, which for me is summer. I use around six times more electricity in summer than winter.
Click to expand...
I'm not sure I'd need a whole 200 amps continuous. Especially if I do things like wait until night time to run washers and dryers. Stove or oven might be an issue. I'd definitely need enough capacity for an air conditioner.
I couldn't find any hybrid inverters that are within the overall price and budget range of the project. I could connect two eg4 18kvs together for 200 amp service, but that's $10k just in inverters.
I didn't realize you can only have 80kwh in a dwelling due to code. That puts a hard limit on this, unless if I build a few small sheds and put 80kwh in each of them. Currently, the total capacity I'm planning for is only 73kwh, so that's fine anyway, but if I want full 200 amp service, then I probably want more batteries.
I'm not sure if it's even possible to get a DIY battery solution approved for insurance.
IGBT said:
Why wouldn't everyone on this system mine bitcoin from 8pm to 5am?
Click to expand...
There's a lot of big bitcoin mines in Texas.
wpns said:
It’s not the 30 cents you are saving, it’s the 12 cents you’d pay some other provider. Plus how/when can they change the terms?
Click to expand...
I calculated the payback period based on 14 c/kwh, which is about what I currently pay. The spreadsheet I linked can calculate it.
This kind of usage isn't banned anywhere in the terms of service, but I wouldn't be surprised if they don't let me renew my contract after 12 months. I'm just trying to figure out if this would be a reasonable way to get cheap power, assuming you can keep the free nights plan.
 
Last edited:
I like your idea, but rarely will a big dog let a little dog steal all the food… try to find a way to let poco make some money while you reap large rewards off your plan ..
or they may just whack you good in some way….try to slip under their radar…

always leave some meat on the bone for the opponent if you are already winning big time..

Good luck…👍
 
bobby3605 said:
I'm not sure I'd need a whole 200 amps continuous. Especially if I do things like wait until night time to run washers and dryers. Stove or oven might be an issue. I'd definitely need enough capacity for an air conditioner.
I couldn't find any hybrid inverters that are within the overall price and budget range of the project. I could connect two eg4 18kvs together for 200 amp service, but that's $10k just in inverters.
I didn't realize you can only have 80kwh in a dwelling due to code. That puts a hard limit on this, unless if I build a few small sheds and put 80kwh in each of them. Currently, the total capacity I'm planning for is only 73kwh, so that's fine anyway, but if I want full 200 amp service, then I probably want more batteries.
I'm not sure if it's even possible to get a DIY battery solution approved for insurance.

There's a lot of big bitcoin mines in Texas.

I calculated the payback period based on 14 c/kwh, which is about what I currently pay. The spreadsheet I linked can calculate it.
This kind of usage isn't banned anywhere in the terms of service, but I wouldn't be surprised if they don't let me renew my contract after 12 months. I'm just trying to figure out if this would be a reasonable way to get cheap power, assuming you can keep the free nights plan.
Click to expand...
Your spreadsheet doesn't show the price after tax credits. But,it also didn't calculate the shipping cost of shipping 1500lbs or so of battery from China. I got a to quote to ship a 100lb inverter and it was $500.

I would estimate $9000-10000 for 75kwh of battery. You also didn't include any balance of system parts, or if you did I didn't see them:

  • 5 bms, maybe 6 , to have a spare on hand
  • Smart shunt
  • Wire
  • Sub panel
  • Breakers
  • Solar assistant
  • Fuses
  • Conduit
  • Tools
  • Misc
For what you want to do there are only two ways
1. Run the whole house on off grid inverters- you'll need enough power to exceed your peak demand. I average about 2kwh an hour but daily peak demand is usually 12-15kw, and as high as 20kw.
So for me it would take two 10-12kw inverters to pull zero from the grid during peak hours.

Youll need a transfer switch to disconnect your main panel from grid, or a sub panel

2. Use a hybrid inverter and let it offset the grid draw up to its maximum. This is far easier imo and you don't have to worry about starting surge for ac but you will inevitably have some spurious export and may get a visit from your Poco, unless you have an interconnection agreement in place, which shouldn't be that difficult if you're not planning to export or add pv.
 
Sounds like your poco is encouraging private investment for power arbitrage.
But with economies of scale this is actually best done centrally, which how it's handled in other parts of the world.
 
JRH said:
I like your idea, but rarely will a big dog let a little dog steal all the food… try to find a way to let poco make some money while you reap large rewards off your plan ..
or they may just whack you good in some way….try to slip under their radar…

always leave some meat on the bone for the opponent if you are already winning big time..

Good luck…👍
Click to expand...
A guy posted on Reddit. With his solar plan he had run a negative balance for 6 straight months. His retail provider kicked him off the plan
 
  • Like
Reactions: JRH
Sounds like your poco is encouraging private investment for power arbitrage.
But with economies of scale this is actually best done centrally, which how it's handled in other parts of the world
1201 said:
Your spreadsheet doesn't show the price after tax credits. But,it also didn't calculate the shipping cost of shipping 1500lbs or so of battery from China. I got a to quote to ship a 100lb inverter and it was $500.

I would estimate $9000-10000 for 75kwh of battery. You also didn't include any balance of system parts, or if you did I didn't see them:

  • 5 bms, maybe 6 , to have a spare on hand
  • Smart shunt
  • Wire
  • Sub panel
  • Breakers
  • Solar assistant
  • Fuses
  • Conduit
  • Tools
  • Misc
For what you want to do there are only two ways
1. Run the whole house on off grid inverters- you'll need enough power to exceed your peak demand. I average about 2kwh an hour but daily peak demand is usually 12-15kw, and as high as 20kw.
So for me it would take two 10-12kw inverters to pull zero from the grid during peak hours.

Youll need a transfer switch to disconnect your main panel from grid, or a sub panel

2. Use a hybrid inverter and let it offset the grid draw up to its maximum. This is far easier imo and you don't have to worry about starting surge for ac but you will inevitably have some spurious export and may get a visit from your Poco, unless you have an interconnection agreement in place, which shouldn't be that difficult if you're not planning to export or add pv.
Click to expand...
And don't forget the opportunity cost of investing that money somewhere else.
 
Also, a thing to check is if that plan from your provider is for solar or batteries.

For me to go to solar, I had to leave my better fixed rate plan and got stuck with a time of use plan that wipes away most of the money I'd be saving.

I would not be surprised if that plan was not available to those with batteries.

bobby3605 said:
I didn't realize you can only have 80kwh in a dwelling due to code. That puts a hard limit on this, unless if I build a few small sheds and put 80kwh in each of them. Currently, the total capacity I'm planning for is only 73kwh, so that's fine anyway, but if I want full 200 amp service, then I probably want more batteries.
Click to expand...
If you want to look up details, look up UL9450 and UL9450A. Also, your state may need to approve your inverter and Batteries off a state list.

If you do good planning on your critical loads panel to be powered off the battery, then you could be OK with less than 200 amps service.

The four big power draws I have are a stove, which is kWh wise is used so little, that will stay off the critical loads panel. The other three big things that 4 ton AC, 5 ton AC, and Tesla Charger. In your plan, I could easily get away with keeping that off the critical loads panel and charging at night only, so it would be free. That leaves the 4 Ton AC and the 5 Ton AC, which may be fine with 100 amp panel and a 16 kW inverter. That 100 amp panel and charging at night would cover 80% of bill. That 100 amp panel would also have a few 15 amp circuits like the 2 X kitchen GFCI, the wifi-router, an outlet by the inverter, and one other 15 amp circuit, also the blower motor for the gas heater, both blower motors for the ACs. The 16 kW inverter will PROBABLY give you enough power to run 2 ACs.

Setting up that critical loads panel is a bit of thought especially once you start thinking seasonal. If you have hot water and an electric dryer, just makes it more difficult. Matching a good inverter that will stand up to the surge of these items is another thing.
 
chrisski said:
Also, a thing to check is if that plan from your provider is for solar or batteries.

For me to go to solar, I had to leave my better fixed rate plan and got stuck with a time of use plan that wipes away most of the money I'd be saving.

I would not be surprised if that plan was not available to those with batteries.


If you want to look up details, look up UL9450 and UL9450A. Also, your state may need to approve your inverter and Batteries off a state list.

If you do good planning on your critical loads panel to be powered off the battery, then you could be OK with less than 200 amps service.

The four big power draws I have are a stove, which is kWh wise is used so little, that will stay off the critical loads panel. The other three big things that 4 ton AC, 5 ton AC, and Tesla Charger. In your plan, I could easily get away with keeping that off the critical loads panel and charging at night only, so it would be free. That leaves the 4 Ton AC and the 5 Ton AC, which may be fine with 100 amp panel and a 16 kW inverter. That 100 amp panel and charging at night would cover 80% of bill. That 100 amp panel would also have a few 15 amp circuits like the 2 X kitchen GFCI, the wifi-router, an outlet by the inverter, and one other 15 amp circuit, also the blower motor for the gas heater, both blower motors for the ACs. The 16 kW inverter will PROBABLY give you enough power to run 2 ACs.

Setting up that critical loads panel is a bit of thought especially once you start thinking seasonal. If you have hot water and an electric dryer, just makes it more difficult. Matching a good inverter that will stand up to the surge of these items is another thing.
Click to expand...
EVE batteries and eg4 inverters are all UL listed, so they shouldn't cause any inspection problems.
At this point, I suppose this is more about a whole home battery backup solution, rather than purely trying to get free energy from the power company.
I found an EVE reseller on alibaba claiming to sell genuine EVE batteries from looking through posts on this forum, and they have actual shipping numbers. Shipping 75 MB31 batteries costs about $850 through them, plus their markup on the batteries themselves. Works out to just under $7k for 75 MB31 batteries. I'd prefer MB30, which have a better cycle rating, but slightly lower Ah, however Luyuan doesn't sell any. I'd probably also have to pay a 25% tariff when importing.

1pcs Grade A Eve 3.2v 314ah Lifepo4 (lfp) Mb31 Cell Battery Fully Matched With 8000cycles--genuine Grade A - Buy Lithium Iron Battery battery Lifepo4 rechargeable Battery mb31 330ah 340ah Product on Alibaba.com

1pcs Grade A Eve 3.2v 314ah Lifepo4 (lfp) Mb31 Cell Battery Fully Matched With 8000cycles--genuine Grade A - Buy Lithium Iron Battery battery Lifepo4 rechargeable Battery mb31 330ah 340ah Product on Alibaba.com
www.alibaba.com www.alibaba.com
2 EG4 18k inverters costs 9796, free shipping from signature solar.
I'd also need battery cases, BMS, cables, etc. Also I'd have to pay sales taxes on this.
A DIY whole home backup system would probably cost somewhere around 20k, after factoring in extra costs and the tax credit.
Signature solar sells a kit with 2 EG4 18ks and 85.8kwh of batteries for 32k.
With the 30% tax credit, that would bring the price down to about 20k, which is about the same as the DIY solution.
The DIY is just a rough estimate, but it looks like you wouldn't save money with a DIY solution, it may even cost more. You'd also lose the 10 year warranty, code certification, and 'polish' of the eg4 powerpro batteries.
signaturesolar.com

EG4 PowerPro ESS | 14.3 - 28.6kWh Capacity | EG4-18Kpv & EG4-PowerPro WallMount Battery | UL9540

Unlock unparalleled energy efficiency with the EG4 PowerPro ESS—a revolutionary pairing of the 18kPV Hybrid Inverter and 14.3kWh Battery. Experience unmatched performance, enhanced safety, streamlined management, and scalability in solar energy storage.
signaturesolar.com signaturesolar.com
$20k with an average daily usage of 67kwh and $0.14/kwh grid cost (cost before free nights plan, free nights grid power is about $0.30/kwh), would take a little over 8 years to break even. That's also assuming the power company doesn't just shut you off after a few months or years.
Until US battery production is in full swing and inverters come down in price, then this is probably not worth it if you want to run your whole 200amp service for free every day.
Today, a smaller system using an inexpensive inverter could have a reasonable payback period, but a whole home backup solution won't unless you also buy solar panels and get cash for the power you sell to the grid.
 
ScropusGobbleBottom said:
Really?? Mostly surprised that single, unboxed, unconnected, Eve prismatic cells would be UL listed.
Click to expand...
According to the EVE's official alibaba page they're UL listed. The 5th picture has a UL certification. The image is a bit blurry, so maybe they're just lying about it, but they're a huge manufacturer, not some random company, so idk.

Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery - Buy Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles eve Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery eve Mb30 306ah 3.2v Lifepo4

Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery - Buy Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles eve Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System...
www.alibaba.com www.alibaba.com

Edit:
Found the official UL listing. MB 30 is one of the model numbers.

MH62190 for EVE POWER Co., Ltd. | UL Solutions

productiq.ulprospector.com productiq.ulprospector.com
 
Last edited:
1201 said:
A guy posted on Reddit. With his solar plan he had run a negative balance for 6 straight months. His retail provider kicked him off the plan
Click to expand...

Serves him right……People sometimes need to learn when to shut up and go with the flow.
Never taunt the spirits …
 
bobby3605 said:
According to the EVE's official alibaba page they're UL listed. The 5th picture has a UL certification. The image is a bit blurry, so maybe they're just lying about it, but they're a huge manufacturer, not some random company, so idk.

Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery - Buy Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles eve Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery eve Mb30 306ah 3.2v Lifepo4

Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery - Buy Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles eve Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System...
www.alibaba.com www.alibaba.com

Edit:
Found the official UL listing. MB 30 is one of the model numbers.

MH62190 for EVE POWER Co., Ltd. | UL Solutions

productiq.ulprospector.com productiq.ulprospector.com
Click to expand...
The cells themselves are UL listed, as is often the case with some preassembled batteries as well.

They are not UL9540/UL9540A which is what's required to be used as batteries in a grid tied UL approved inverter/battery combo.
 
bobby3605 said:
EVE batteries and eg4 inverters are all UL listed, so they shouldn't cause any inspection problems.
At this point, I suppose this is more about a whole home battery backup solution, rather than purely trying to get free energy from the power company.
I found an EVE reseller on alibaba claiming to sell genuine EVE batteries from looking through posts on this forum, and they have actual shipping numbers. Shipping 75 MB31 batteries costs about $850 through them, plus their markup on the batteries themselves. Works out to just under $7k for 75 MB31 batteries. I'd prefer MB30, which have a better cycle rating, but slightly lower Ah, however Luyuan doesn't sell any. I'd probably also have to pay a 25% tariff when importing.

1pcs Grade A Eve 3.2v 314ah Lifepo4 (lfp) Mb31 Cell Battery Fully Matched With 8000cycles--genuine Grade A - Buy Lithium Iron Battery battery Lifepo4 rechargeable Battery mb31 330ah 340ah Product on Alibaba.com

1pcs Grade A Eve 3.2v 314ah Lifepo4 (lfp) Mb31 Cell Battery Fully Matched With 8000cycles--genuine Grade A - Buy Lithium Iron Battery battery Lifepo4 rechargeable Battery mb31 330ah 340ah Product on Alibaba.com
www.alibaba.com www.alibaba.com
2 EG4 18k inverters costs 9796, free shipping from signature solar.
I'd also need battery cases, BMS, cables, etc. Also I'd have to pay sales taxes on this.
A DIY whole home backup system would probably cost somewhere around 20k, after factoring in extra costs and the tax credit.
Signature solar sells a kit with 2 EG4 18ks and 85.8kwh of batteries for 32k.
With the 30% tax credit, that would bring the price down to about 20k, which is about the same as the DIY solution.
The DIY is just a rough estimate, but it looks like you wouldn't save money with a DIY solution, it may even cost more. You'd also lose the 10 year warranty, code certification, and 'polish' of the eg4 powerpro batteries.
signaturesolar.com

EG4 PowerPro ESS | 14.3 - 28.6kWh Capacity | EG4-18Kpv & EG4-PowerPro WallMount Battery | UL9540

Unlock unparalleled energy efficiency with the EG4 PowerPro ESS—a revolutionary pairing of the 18kPV Hybrid Inverter and 14.3kWh Battery. Experience unmatched performance, enhanced safety, streamlined management, and scalability in solar energy storage.
signaturesolar.com signaturesolar.com
$20k with an average daily usage of 67kwh and $0.14/kwh grid cost (cost before free nights plan, free nights grid power is about $0.30/kwh), would take a little over 8 years to break even. That's also assuming the power company doesn't just shut you off after a few months or years.
Until US battery production is in full swing and inverters come down in price, then this is probably not worth it if you want to run your whole 200amp service for free every day.
Today, a smaller system using an inexpensive inverter could have a reasonable payback period, but a whole home backup solution won't unless you also buy solar panels and get cash for the power you sell to the grid.
Click to expand...
This will be my last post in this thread.

Your goal is to have no to almost no energy bill. There are many ways to get there. 15kw of pv in Texas should make about 75kwh per day. That can be found for about $5k before tax credit.
Op You keep going on about 200amp service . Do you actually know what your peak demand is? What's the point of having 200a worth of inverter if you only ever use 100a.

Nowadays you can buy 20kw of inverting power for $2200 before tax credit. Mounting for 15kw may cost $3k

So 5k for pv
2.2k for inverter
3k for mounting
$4k for 30kwh of battery
And $2k for balance of system

So let's say $12k after tax credit all in to almost zero out your bill and have backup power .
JRH said:
Serves him right……People sometimes need to learn when to shut up and go with the flow.
Never taunt the spirits …
Click to expand...
The free nights plan is iffy since there is nothing one can do if they change the terms but it's probably even cheaper to just get pv , off grid inverters and some battery storage and have basically no energy bill. What is the Poco going to do then- remove the meter? 😂

Seriously though in most places they can't do much if the pv system is not connected to the grid.
 
You can buy power for 29.6 c/kwh ?? 😱

Where can I sign up??

1721004772492.png

bobby3605 said:
According to the EVE's official alibaba page they're UL listed. The 5th picture has a UL certification. The image is a bit blurry, so maybe they're just lying about it, but they're a huge manufacturer, not some random company, so idk.

Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery - Buy Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles eve Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery eve Mb30 306ah 3.2v Lifepo4

Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery - Buy Eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles eve Energy Storage System Cell Lifepo4 306ah Lifepo4 Battery eve Mb30 306ah 3.2v Lifepo4 Battery 10000 Cycles Energy Storage System...
www.alibaba.com www.alibaba.com

Edit:
Found the official UL listing. MB 30 is one of the model numbers.

MH62190 for EVE POWER Co., Ltd. | UL Solutions

productiq.ulprospector.com productiq.ulprospector.com
Click to expand...

I don't see how a single cell can be UL Listed

cs1234 said:
The cells themselves are UL listed, as is often the case with some preassembled batteries as well.

They are not UL9540/UL9540A which is what's required to be used as batteries in a grid tied UL approved inverter/battery combo.
Click to expand...

Or if they are, that it means much of anything at all.


From Alibaba link, UL: "Module Test Report - Method for Evaluating Thermal Runaway Fire Propagation in ESS"
Doesn't sound like a cell to me.

The cell by itself is easy to make bloat and vent flammable gasses. Whether it is safe has to do with the charging and BMS circuits.
Can't test fire propagation for a single cell.

My AGM batteries are "UL Recognized", not "UL Listed"
 
You are getting fudged with TXU. I would suggest shopping around for a better rate. That is more than double what any of the off brand companies charge. TXU is the highest there is in the state. Most other plans are around $0.06-0.11 per kw.

A friend just got off TXU a few months ago. Electric bill went from average of $450.00 to $86.00 per month in the last two statements.
 
Last edited:
You must log in or register to reply here.

Similar threads

J
Question - large amount solar panels (17kw), small back up battery system - Grid tied hybrid
Replies
7
Views
280
Vince2
V
S
Power controller for electric heat
Replies
13
Views
646
SolarRich
S
L
Asking for experiences with Aliexpress solar sellers that claim to have EU stock (EASUN POWER EU VAT-FREE Store especially)
Replies
4
Views
718
drjaymz
D
T
Solar on single phase of 3 phase house
2
Replies
33
Views
1K
Tarquinbob
T
X
Solark 15K Using 2 Different Types of Batteries at once
Replies
14
Views
527
Cmiller
C

diy solar

diy solar
Back
Top