The Alternative Energy Thread - Generators, Solar, UPS, Wind

[saqibhassan95]

Really enjoyed watching this video on local lithium battery production

not worth it tbh
really expensive, almost 45-50%, as compared to pylon tech in terms of Rs/cycle

[umans]

Locally assembled battery with 18650 type cells of unknown origin, no safety rating, 478K for 133ah..... Pylontech is still way more better deal than this.

[mgalaxy3]

If I have a 24v lithium / lifepo4 battery, can I get another 24v lifepo4 and connect them in series to get 48v (later want to connect with a new 48v inverter).

Is this usually an issue with lithium batteries / BMS?

[umans]

Not in case of pylontech or Narada. You cannot connect them in series.
You can do that with batteries without BMS.

[muhammad.yasir94]

I'm in the process of setting up a 3KW solar inverter system with an Inverex inverter in Karachi, and I'm currently on the lookout for the best tall tubular battery that complements this setup. As we all know, choosing the right battery is crucial for the efficiency and longevity of a solar power system.

I've done some research, but I wanted to reach out to this knowledgeable community for insights and recommendations. If you have experience with a specific tall tubular battery model that has performed exceptionally well with a 3KW solar inverter, especially in the Karachi climate, I'd greatly appreciate your input.

Here are a few things I'm considering:

Durability: How long has your chosen battery lasted, and how well has it withstood Karachi's temperature variations?

Maintenance: Any insights on maintenance requirements and tips for prolonging battery life?

I'm eager to hear about your experiences and recommendations. Your insights will be invaluable in helping me make an informed decision. Thanks in advance for your contributions!

[pwuser167536480499]

I am no solar expert but have got installed a solar unit at my home. My two cents are as follows.

3 kw unit has very little utility so I would recommend a 6 kw hybrid set up. Ofcourse you will have to increase your budget.

Net metering is a must for solar system.
If there is no load shedding then expensive batteries are not required. Modern day inverters are MPPT they run fine without any battery. If solare energy is more than requiremnt of your house it would be fed to Wapda. But if your demand is more then inverter will draw additional power from Wapda. Batteries are required only during load shedding at night time when both solar and Wapda are out.

I have used tall tabular batteries of Osaka and Phoenix both. They have long life but their backup is not that high what they claim. Price wise these are 10 k expensive than simple batteries of same capacity.
If loadshedding is not of much concern I would recommend simple battery of AGS of 85 AH capacity at the max. A 3kw setup would require 02 batteries while a 6kw one need 4.

Cost of solar pwer sytem is verying very much on almost day to day basis due to dollar fluctuation and constant decrease in prices of solar penals in China and also in the international market. However a 6kw unit should roughly cost like below

14 plates@ 50000 = 700000
Inverter =200000
Stands for plates 7@5000= 35000
Cables = 65000
Batteries 4 @ 25000= 100000
Installation cost + misc items = 50000
Net metering cost = 100000
Total= 1250000 (1.25 million rupees)

With this investment you shall inshaAllah have zero electricty bill for at least 15 years.

Typical household bill these days is 50000 @ 8 months in summer and 10000 @ 4 months in winter for Karachi weather. So total = 440000
In 03 years your investment will pay back in full and the remaining 12 years are a bonus. Moreover you will be serving the country by providing cheap electriity to Wapda and also helping to end load shedding.

Hope it helps

[capsat]

4 KW system connected to 2 x EXIDE TR 3500 are working flaw less since 18 months, at a remote place with backup of 8 hours at 100% 3000 - 3500 watt load when visitors are there for over night.

However the load is minimal during week days and battery back up lasts after sunset to sunrise without any alarms, (i.e 2 bracket fans, 1 water dispenser a triplet freezer, few cell phone chargers, 8 led bulbs x 15 watts, random automatic sensor operated 6 x100 watt LED flood lights - 42" LED Home theatre system is optional load when guests are there)

• Flooded Battery life is based on its charge / discharge cycle. If the inverter is optimised to charge the batteries, it will outlast the warranty life with extended premium period. Performance of any battery is dependent upon its charge current and recharge cycle.

you may read this thread to understand more,

[nfssaad]

net metering ka sara masla is 3 phase inverter.

hybrid 3 phase is nearly 10 lac just for the inverter

[pwuser167536480499]

In our housing society single phase inverters are installed with 03 phase double direction meters for the net metering. No issue. On one phase there is net metering and other two Phases are left out. Still they get the whole benefit of net metering.

I do not know about which city or province you are talking about. In Punjab single phase inverters are working fine with net metering 03 phase meters.

[nfssaad]

karachi. its mandatory for KE to have 3 phase inverter

[sufyan.j]

I guess this is a must across country for Net Metering

[mrdeejay]

What's the current rate of customized solar structure in Lahore?

Are P2, P3 or P4 structures available in Pakistan?

[sardarg]

sirs what shall be recommended hybrid solution to compensate load shedding hours
Total 9 -10 hours of load shedding between 6.30 am to 10.30 pm (2 +3.5 +1.5 +1.5 +1.0)

1 Haier Inverter 18 Cu Fridge 24/7 & Day time intermittent 2 - 5 minute usage of Microwave oven 2000 watt

1.5 ton Kenwood Inverter AC / Domestic Iron / Washing machine is used at night only after 11.pm

[capsat]

893 units (for 30 days) means approx 30 units a day.
roughly 3 kw a day.

to compensate for load shedding, during sunlight hours you need a 5kw hybrid system. It can cater for day time running load while excess current from panels is used to charge batteries without sharing, for drain after sunset hours.

if inverter is 48 volt input use 190 AH batteries, if the inverter has 24V input use 285 AH batteries.

@mgalaxy3 @AkbarGr8 @centos @umans

[AkbarGr8]

Any budgetary restraints? Is net metering an option in your locality if a single phase inverter is used?

[centos]

6 KW nitrox or equivalent with 8KW of panels and 100AH lithium battery or 4 x 250+AH tubular batteries

[sardarg]

@AKBARGr8 sir thank you .

it is single phase meter and net-metering is not required, the person is looking to manage power during the load shedding hours.

@Centos thank you sir

250 AH Tubular batteries are bit expensive, what will be disadvantage if Truck batteries of same ah are used??

[AkbarGr8]

Based on your comments it does appear there are major budgetary restraints.

I would recommend what @centos suggested but with lithium battery if there will be frequent discharging i.e loadshedding which drains the battery on a regular basis.

Truck battery is NOT an option as it's not designed for deep / frequent discharge.

[mrdeejay]

What's the current rate of customized solar structure in Lahore?

Are P2, P3 or P4 structures available in Pakistan?

[saqibhassan95]

Total 9 -10 hours of load shedding between 6.30 am to 10.30 pm (2 +3.5 +1.5 +1.5 +1.0)

load shedding hours exact breakup available?
like you mentioned (2 +3.5 +1.5 +1.5 +1.0),
along with hours, mention exact time if possible, like 8:15 to 9:15 am, then 12:15-1:15 pm and onwards
I want to evaluate whether tubular will be fine or if bare minimum requirement is lithium ion