Beginners Guide to Processing 18650 Cells | Cell Database


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Looking for high range input pure sine wave inv.
#1
Hello,

My setup consists of 4s320p, so my total output is ~16.72V.

I am looking for a pure sine wave inverter that accepts 16.72V, but finding it very hard to find anything.
All I have come across is 15V max.

Anyone have any leads, or ideas to help me out?

Thanks in advance.
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#2
Go to 7s or 14s instead and its easier Smile

Dont have any 4s tips im afraid. Because that area is very hard Sad
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#3
Yep, agree with Daromer. Probably the only way you're gonna get a Pure Sine Inverter to run at 16V is to have it custom built. I have an eBay user that can do that, but I don't believe it'd be cost effective to do so. Not to mention you'd run into inefficiencies along the way.

If your packs are already made, it won't be that difficult to alter their layouts to get 7s or 14s (24v or 48v). 24V inverters are able to be had, but they are a little less efficient than the 48V inverters. Especially if you want to run split phase 120V. (not sure where your location is as it's not filled out in the bio)
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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#4
Thanks for the responses!

I just did the math, and turns out you both are 100% correct.

I found a 24V inverter on Amazon with these stats:
INPUT: 21V to 30V
LOW VOLTAGE SHUT OFF: 18.5-20.5
OVER VOLTRAGE SHUT DOWN: 30.5

So if my math is correct, if I turn my packs into 7S, (4.18 X 7 = 29.26 at full charge, and 3.5 X 7 = 24 at lowest) I think that would work perfectly.

I would also have to rewire my solar panels in series instead of parallel, and of course get a new mppt that accepts 24V.
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#5
You can safely discharge to 3.2V/cell, that'd give you the low end of 22.4V

By stopping at 3.5V you are leaving a lot of power still available for use. The curve usually starts to taper off around 3.2 - 2.8V (depending on cell type).
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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#6
Smile

As Korishan said. At full crank you cant stop at 3.5V because that could potentially leave 50% left SOC in the cells. But resting voltage can be 3.5V.
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
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#7
Ive never gone below 3.5, but its good to know I "could"!

Thanks guys, this really helped me out a lot. I am super glad this website exists, even though I just found it.

And I just found out my mppt does work well with 24V, YAY!

daromer, great videos by the way, keep them coming!
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#8
Is a 15s system bad for a 48v system? If my inverter can accept it? If I only charged to 4.0 my volts would be at 60. I found an inverter that accepts that. I think, based off of memory. Let me know.
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#9
(10-18-2017, 04:27 AM)shonalex Wrote: Is a 15s system bad for a 48v system? If my inverter can accept it? If I only charged to 4.0 my volts would be at 60. I found an inverter that accepts that. I think, based off of memory. Let me know.
If your inverter and charge controller can handle the voltage then yes you can use it.

Sent from my LG-H812 using Tapatalk
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