I came across this beautiful piece and I thought newbies can learn a thing or two from it...

How does Depth of Discharge factor into Grid Connected battery systems?

There are several criteria to consider when designing a battery system but it is Depth of Discharge (DOD) that has a prominent effect on the lifespan of the battery

In order to design a battery that will last and provide reliable service for its full rated life, there are several criteria to consider, some of which have already been covered in our Battery O&M article. Operating temperature, voltage, charging and discharging rates as well as planned depth of discharge and days of autonomy are all key terms that are factored into the battery size and type – but one of these items, Depth of Discharge (DOD), has a prominent effect on the lifespan of the battery. DOD is very closely linked with Cycle Life – or the number of discharge cycles a battery can complete before being reduced to 80% of its original capacity (the point at which a battery is considered to have passed its useful life). Although the most common type of battery chemistry for solar use is lead acid, DOD affects every battery chemistry to some extent.

It is very common to hear of battery designers simply doubling the size of a battery based on calculated loads and discharge duration to achieve a 50% DOD and arrive at an overall battery size and budget. For the lead acid battery, this is but the starting point.

Generally speaking, there are two types of deep cycle solar connected batteries. The most common is the Off Grid battery that cycles every day and has enough size to weather extended low irradiance. The second most common is a battery sized for occasional backup and reserve power – also notably with Grid Tied AC coupled systems.

Assuming the loads and days of autonomy are already known, how does an AC coupled back up battery differ in size from an off grid battery? The battery is an array of cells – in series and parallel. Each cell is a chemical reaction and if the chemical reaction can be kept within a sustainable window, then the capacity of each cell to support the reaction can stay strong for the full rated life of the battery and even longer.

Here is a typical plot of battery life cycles vs. DOD. At 50% DOD, the referenced battery is expected to last 1150 cycles before its capacity is reduced to 80% of original, but at 20% DOD per cycle, the battery could be expected to last 3300 cycles (or 9 years at 1 cycle per day) – which is a respectable design target for an Off Grid battery.

Keeping the cycle life of a battery in mind – what is a more accurate guideline than the “50% rule”? For off grid applications, where the battery can be expected to cycle every day, a better guideline would be to design to a DOD of 20%, not 50%.

For grid tied systems with batteries used for backup only, DOD can be taken much further since the grid can be expected to cover at least some of days that the system is running and hopefully most of them – we don’t want to plan for 100% DOD – extreme discharging can permanently damage a battery. But if we planned for 80% DOD that would allow us 675 cycles, and it’s unlikely that we’d experience 675 days of power outages in a 10 year period.

In summary, when designing a battery for backup use, Depth of Discharge can be set considerably lower that when designing a battery for daily, cycling use. So, for example, if a system with 500Ah of projected demand is connected to a relatively healthy grid, with only occasional outages expected, and the battery is a high quality deep cycle battery, what might have been a 1000Ah battery with a 50% DOD design, can now be a 600Ah battery with a periodic discharge of 80% - a substantial savings in cost and space.


Reference: https://www.civicsolar.com/support/installer/articles/how-does-depth-discharge-factor-grid-connected-battery-systems

heydora:



hello bro, need your advice on a cost efficient upgrade.currently i use a 1.5kva luminous inverter,2 220mah flooded batteries,4*250 mono panel and a 40A pwm controller but i want to upgrade to 4*220mah batteries and 8*250 panels.My installer says i can still retain my 1.5kva inverter,40A controller but will just take a longer time to charge....whats your opinion.Thanks

So many things comes into play, hw long v u been using the previous ba3s, secondly change ur controller.
For further discuss call/whatapp 08117398294

the good days appear to be coming back
hit 12kw today, which is x4 of my installed panel array.
waiting for the day i would hit the theoritical optimum harvest of x5 of my array , which is 15kw

anybody seen/have in stock 6v 500ah smf batts??,

For Quality Industrial Power Back-up Equipment such as Gaston Battery , Vertiv/Emerson UPS, Outback/ Xantrex Inverters & AVR, call us on 080-6633-2919

earthrealm:
the good days appear to be coming back
hit 12kw today, which is x4 of my installed panel array.
waiting for the day i would hit the theoritical optimum harvest of x5 of my array , which is 15kw

anybody seen/have in stock 6v 500ah smf batts??,

I envy you guys.... My shrewd and parochial minded landlord has put paid to my solar dreams.. and no be day the place de get light sef. Mstcheww

Oshomo12:


This people and their hopelessness, duwdu should have info on the payment. Kindly let us know how much u pay at the end. Good luck!

Package received after paying 10,700. How they arrive at the figure remain unknown to me but I just needed to retrieve the package so didn't ask much questions.

One down from the required ingredients now many more to get

ojeysky:


You should add the prices and also the warranty info (if any)

Available in stock
7ah
12ah
18ah
100ah
200ah

1yr warranty with terms and conditions

good day my people. all protocols duly observed.

anyone with clean used panels 250w - 300w for sale? WhatsApp me 08033735359 sharp sharp. pls sweet price o. I need 4pcs

idsolar:
good day my people. all protocols duly observed.

anyone with clean used panels 250w - 300w for sale? WhatsApp me 08033735359 sharp sharp. pls sweet price o. I need 4pcs

I have similar needs anyone with such should reach me as well

oluwaslimzzy:



Available in stock
7ah @ 2700
12ah @4800
18ah @6000
100ah @30000
200ah @70000 (60kg)

1yr warranty with terms and conditions

Sounds like a good price, anyone with experience on this one?

oluwaslimzzy:



Available in stock
7ah @ 2700
12ah @4800
18ah @6000
100ah @30000
200ah @70000 (60kg)

1yr warranty with terms and conditions

Thanks Bros!

That what we want.

Anyone in tubular form

efuro:


Thanks Bros!

That what we want.

Anyone in tubular form

You are very welcome Sir but for now none in tabular form... in terms of quality it’s of very high standards... already have installation firms who has ran a test on it and certified it before using it in order not risk loosing their clients with regards to cases of Battery failure.... and so far we have been in the business their haven’t been cases of returns .... so your reputation matters a lot to us

oluwaslimzzy:




You are very welcome Sir but for now none in tabular form... in terms of quality it’s of very high standards... already have installation firms who has ran a test on it and certified it before using it in order not risk loosing their clients with regards to cases of Battery failure.... and so far we have been in the business their haven’t been cases of returns .... so your reputation matters a lot to us

whats the country of manufacture/

Good morning house.

Please, I need help one of the 4 AGM 200AH (make is hidden for now as I haven't discussed with the seller) I bought about six months ago is giving 10.5V while the rest 3 is giving 12.6V. Desulphator is connected and correct battery setup performed on the Solar charge controller.

Please what are the causes and is there any remedy to salvage the situation.

All info / help appreciated. I will also reach out to the seller. Will update the house.

earthrealm:


whats the country of manufacture/

Sincerely speaking it’s manufactured by PATTERN BATTERY CHINA with a specific high standard of our taste because we wish to build a resounding reputation in deep cycle battery market and renewable energy at large

Hello good people of this forum, please, I urgently need a link to buy Tesla power wall here in Nigeria.

I've tried some companies including PSC solar, they don't have in stock.

I would really appreciate a link to buy it here or to get it directly from the company abroad.

Any help is highly appreciated.

PS: if there is any other alternative of comparable quality to the power wall, I'd like to know.

Thanks in advance

Braaad:
Hello good people of this forum, please, I urgently need a link to buy Tesla power wall here in Nigeria.

I've tried some companies including PSC solar, they don't have in stock.

I would really appreciate a link to buy it here or to get it directly from the company abroad.

Any help is highly appreciated.

PS: if there is any other alternative of comparable quality to the power wall, I'd like to know.

Thanks in advance

Telsa powerwall - I had someone complaining to the fact that you may need to book or "order-on-queue", not off the shelf thing. Anyway I wait to be guided on that!

However, Try AWPS, I thinks he has launched to the realm you desire.


https://www.youtube.com/watch?v=3NBsT4igpG8&feature=youtu.be

bodeface:
Good morning house.

Please, I need help one of the 4 AGM 200AH (make is hidden for now as I haven't discussed with the seller) I bought about six months ago is giving 10.5V while the rest 3 is giving 12.6V. Desulphator is connected and correct battery setup performed on the Solar charge controller.

Please what are the causes and is there any remedy to salvage the situation.

All info / help appreciated. I will also reach out to the seller. Will update the house.

Was it bought brand new or Second used?

They are all new ones, just bought about 2 months after manufacturing date stamped on it.

DUNKA:
Was it bought brand new or Second used?

.

Braaad:
Hello good people of this forum, please, I urgently need a link to buy Tesla power wall here in Nigeria.

I've tried some companies including PSC solar, they don't have in stock.

I would really appreciate a link to buy it here or to get it directly from the company abroad.

Any help is highly appreciated.

PS: if there is any other alternative of comparable quality to the power wall, I'd like to know.

Thanks in advance

There are people on nairaland who build similar packs of any capacity you want....the bells and whistles absent of course

Braaad:
Hello good people of this forum, please, I urgently need a link to buy Tesla power wall here in Nigeria.

I've tried some companies including PSC solar, they don't have in stock.

I would really appreciate a link to buy it here or to get it directly from the company abroad.

Any help is highly appreciated.

PS: if there is any other alternative of comparable quality to the power wall, I'd like to know.

Thanks in advance

Contact solardepot in Ibadan, he has BYD lithium batteries, and very good product too.

bodeface:
Good morning house.

Please, I need help one of the 4 AGM 200AH (make is hidden for now as I haven't discussed with the seller) I bought about six months ago is giving 10.5V while the rest 3 is giving 12.6V. Desulphator is connected and correct battery setup performed on the Solar charge controller.

Please what are the causes and is there any remedy to salvage the situation.

All info / help appreciated. I will also reach out to the seller. Will update the house.

The battery probably have one or two cells shorted. Remedy, none(get it replaced if there is warranty on it).

bodeface:
Good morning house.

Please, I need help one of the 4 AGM 200AH (make is hidden for now as I haven't discussed with the seller) I bought about six months ago is giving 10.5V while the rest 3 is giving 12.6V. Desulphator is connected and correct battery setup performed on the Solar charge controller.

Please what are the causes and is there any remedy to salvage the situation.

All info / help appreciated. I will also reach out to the seller. Will update the house.

One cell out of the 6 in the battery is bad.
Replace the bad battery and use a good battery balancer.

mank1234:

One cell out of the 6 in the battery is bad.
Replace the bad battery and use a good battery balancer.

Nightmare of every enthusiast

bodeface:
Good morning house.
Please, I need help one of the 4 AGM 200AH (make is hidden for now as I haven't discussed with the seller) I bought about six months ago is giving 10.5V while the rest 3 is giving 12.6V. Desulphator is connected and correct battery setup performed on the Solar charge controller.

Please what are the causes and is there any remedy to salvage the situation.

All info / help appreciated. I will also reach out to the seller. Will update the house.

Your battery is probably beyond salvage. However, best practices vary. Kindly supply more info to help forestall a recurrence
- battery make
- absorb voltage
- duration of absorb
- float voltage
- did you remember to disable automatic equalisation? (many CC have it on auto)
- brand of desulphator
- any other relevant information you might wish to offer

Saipro:

Your battery is probably beyond salvage. However, best practices vary. Kindly supply more info to help forestall a recurrence
- battery make
- absorb voltage
- duration of absorb
- float voltage
- did you remember to disable automatic equalisation? (many CC have it on auto)
- brand of desulphator
- any other relevant information you might wish to offer

in addition call the supplier to make good on warranty as was surely promised you before money changed hands.,but dont hold your breath as it is now you will know that speaking English and understanding English are 2 different things

Oshomo12:


The battery probably have one or two cells shorted. Remedy, none(get it replaced if there is warranty on it).

You have said it all. This is a case of a bad battery. Under 2 months says it is bad from the factory so you best recourse is to have it replaced.

WE BUY DEAD/SCRAP BATTERIES!!!

We also buy off scrap/dead batteries from any state (T&C applies) .

12v 200a ..... N13,000
12v 150a.......N9,5,00
12v 100a.......N6,500
2v 500a.......N5,000

Contact,
Smartcell global services
081-350-31951
WHATSAPP::: https:///2348170385620

bigrovar:

You have said it all. This is a case of a bad battery. Under 2 months says it is bad from the factory so you best recourse is to have it replaced.

errrrm think, he needs to state his load, and probablly charging pattern/frequency etc. and he said 6months..not 2months....


@kiekie..savage you are!!.. posting your WE BUY DEAD BATTS ADVERTS immediately,..lolz..guess na coincidence,

bodeface:
Good morning house.

Please, I need help one of the 4 AGM 200AH (make is hidden for now as I haven't discussed with the seller) I bought about six months ago is giving 10.5V while the rest 3 is giving 12.6V. Desulphator is connected and correct battery setup performed on the Solar charge controller.

Please what are the causes and is there any remedy to salvage the situation.

All info / help appreciated. I will also reach out to the seller. Will update the house.

yeah, the batt is likely gone as others have pointed out, errm..am a lil curious. its displays 10.5v when charged or when discharged....or under load?