Beginners Guide to Processing 18650 Cells | Cell Database


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Battery advice for my solar system?
#1
Hello there. The solar system that I use at home is working with the acid battery. Its performance is lower than that. I want to build a battery pack of 18650 batteries.

How many cells and series do I need to make?
Do I need to use the BMS system?

I need your advice in this regard.

System features;

2x250 watt solar panel
4x90Ah Acid battery
3200 watt inverter (chargeable)

Devices I use
A refrigerator
Washing machine
Dishwasher
Lambs
Small household appliances

Thank you for your answers already
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#2
A refrigerator, Washing machine & Dishwasher require high amount of power needed. With 2x250w solar panel, it may not be fast enough to charge up the battery within a day. Moreover, if days or cloudy or raining.. you do not have enough backup. An estimate if you're able to run you appliances using 3.2Kw inverter, you should require double or triple the power of battery needed. At the same time, increase the solar panel as well....
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#3
Dam Lim Thank you for your reply. I just started this business. I'll have 2 solar panels. I have a lot of sunlight in the area. I live in Hatay, Turkey. Do you have any suggestions on the battery? How much cell and serial combination do I have to make?

There are 14 likely to be serials. How many cells I want to learn will be regular, in parallel?
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#4
Series depend on the inverter and charger.
Paralell depends on type of cells and how much stored eneegy is needed and also the max current.

On mobile so cant add numbers now but someone else can
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#5
Inverter device 3200 watts. It can charge between 1 ampere and 50 amperes. I can choose how much current flows.

It will not be standard since the cells will be from old laptop batteries.
Daily consumption 5kw
The maximum load is 1.5kw

Inverter device

[Image: 3YCCcTZBBF0qDpUa-38ZtPkj04f6btoIvOgK63dz...75-h379-no]
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#6
Looks like a MPP clone.

For only 2 panels you will not be able to charge much per day at all. But on the other hand its better to have more cells per pack than to few. Dont go below what you have today that is 45Ah. (50% of the Lead acid)
That would be 14s20p with 2.2Ah cells. BUT I personally dont recomend more than 1A per cell to not stress them. (Same as you tested with) And that would be 1kw max useage. On inverter side perhaps 800w.

So to get 1.5kw i would recomend 14s40p at minimum!
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#7
Since you have Inverter onhand, firstly you need to determine what Voltage is best for your inverter, 24V/48V. This decision has to be made before you start putting all the cells together... a 14s will give you 14x3.7V= ~51V-55V. After that you need to calculate the power (Watts). Assuming each battery is 2A, 20p = 40 Amp / 40p = 80 Amp.... You use the final ampere x 3.7V, that will give you the total power you need. The more the better as Daromer mentioned. In this configuration you need at least more than 5 panels of 250W to power your inverter and charge the battery...
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#8
Thank you for your dan lim and daromer answers. I think I'll start with 14s and 50 cells in the first place. This battery is assumed to be 1 amp power, how many watts of power it contains. For now the refrigerator and the lights are enough for the nights. We do laundry and other heavy work daytime.

Write power calculation formula in watts

14s*50cell*1amp=700amp*4.2v=2940 watt

This account is correct?

Can we use all 2940 watts?
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#9
Averaging 18650 around 2-2.3Amp, the better ones are 2.6-3Amp.... just take "2A"...
Not correct, as you're connecting in series (14s), the voltage will increase, the power remain the same...
so, for 1s = 50cells x2A = 100Amp.
P= 100A x 51V(14s) = ~5100W.
Should be enough to power your inverter.
Total you need 50cells x 14 = 700cells
With this you need more solar panel to charge up this amount of battery...
solar panel = 250 watt x 10 = 2500w.. At least it can charge 50% of your battery..
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#10
(06-23-2017, 03:50 AM)Dan Lim Wrote: 18650 civarında ortalama 2-2.3Amp, daha iyi olanlar 2.6-3Amp .... sadece "2A" al ...
Doğru değil, seri (14s) bağlanırken gerilim artacak, güç Aynı kalır ...
yani, 1s = 50cells x2A = 100Amp için.
P = 100A x 51V (14s) = ~ 5100W.
İnverterinize güç vermek için yeterli olmalıdır.
İhtiyacınız olan toplam 50 hücre x 14 = 700 hücredir
Bununla bu miktarı şarj etmek için daha fazla güneş paneline ihtiyacınız var ...
güneş paneli = 250 watt x 10 = 2500w .. En azından pilinizin% 50'sini şarj edebilirsiniz ..

Is not that much for this battery with 10 250 watt solar panels? The sunshine calendar we have here is here.

http://www.eie.gov.tr/MyCalculator/pages/31.aspx

2x250watt'lık güneş panelim güneşli bir gün için asit sigara içiyor. İki tane daha güneş panelim olacak. Toplam 4x250 watt olacaktır. Bu 14sx50 hücre için yeterli değil mi?
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