CORRECTION: At 2:38 we made a math error. 0.2C Rate should be 0.05C.

@westking7746

2 жыл бұрын

I am just a beginner, but according to Micah Toll and a couple of others: C rate = (Maximum continuous discharge rating in amps)/ (Amp hour rating) as specified by the manufacturer. So that would mean: 5A/100Ah = 0.05C rate That equation really should be edited to read as such because a lot of us took Amy to be the solar Goddess. As you know, C rate is a fairly important calculation that if done incorrectly could lead to some extreme consequences. With all of that being said, all of the other examples should be recalculated and edited as needed. Amy may have been looking for pre-determined values to fit particular answers. For example that value of 0.2C seems to be a popular value used in a lot of KZread videos. Honestly, I think that there are a number of video posters who don't bother to do the actual calculations. For example, I am seeing videos that are claiming in so many words that the C rate is the same as the Ah specification. While this may be true in some cases, If Toll is correct, the C rate and the Ah specification are not always the same. Thus, the C rate should always be checked according to the above equation.

Just found out that Amy has passed. Man, I'm sad! This woman has guided me through so many tough subjects without making me feel stupid. I didn't even know she'd been fighting cancer. I honestly thought I would someday make the journey from the southeast Missouri Ozarks up to Maine to tell her thank you. So- thank you, Amy. May God bless you and your family. Lee Butcher, Park Hills, MO

Thank you Amy "Solar Queen" for your contribution in my solar journey. You will be missed. Condolence to the family.

Amy's last video :( Thank you for all of your informational content over the years. RIP Solar Queen

Geez people take a break. Amy is a Legend in the Solar video world

We are all going to miss you greatly! My condolences to Andy, family, friends and coworkers.

Thank you for making battery C' concept clear with number of examples. Regard ..... just learn from the below message.... its heart rendering to see that She is no more... what a loss to Solar enthusiast like me. Praying for her. My condolences to family, friends and coworkers

Thank you so much Amy. You are pretty good at making a complicated subject seem simple.

Good work, Amy. The discussion of "keeping batteries happy" does not often include the optimum and maximum charge rates, but more likely only DOD vs chemical type vs cost, so it's great you're bringing this concept into the series. Many good solar chargers can have their charge rates set (I'm not telling you anything new, I'm sure), and this can be used to match the charging output to the battery bank optimum or maximum charge rate. All of our inverter/chargers can be set from 10A to 140A in 10A intervals, so it's easy to match the solar charging output to the maximum rate of the battery bank, regardless of the array size or maximum output of the solar charger, so that's handy. If I have a battery bank 48V, 2 parallel strings of 4 @ 140Ah (13.4kWh), but the max charge rate of each string is 40A, I can set the solar charger to max 80A, even though the array is good for 130A+. I'm liking this series. Keep it up. Cheers, from Australia.

i am from Sydney, i really like your knowledge and style , some time its not enough to have the knowledge whats important is how to pass this knowledge to your student and how they feel about it, you have them both and i appropriate what you doing, i wish you the best of everything, good on you mate.

Unlike most of your videos, this one took a while for the message to start coming through. It is a really complex topic, though, and you pulled it all together, in the second half of the video. I can honestly say that your explanations have done a lot to help me understand how to make decisions about battery sizing, solar panel sizing, and knowing how each individual use case impacts what will work "best". Thank you for continuing to deliver a beautiful and graceful message!

great video, i always wondered what the c rating meant. i watched other videos on this subject and yours was the best at describing it. thx

Thank you I can understand what you are talking about and I love it!!

Thank you so much from South Africa

Thank you. I still have so much to learn. Greatfull

She is back😁

Thank you.

I'm not disputing the Queen of the Sun , love your dedication to the art . I have never heard of sizing your battery bank to match your max charge output of your inverter or charge controller . This is adjustable in all quality equipment . I thought one should adjust there battery bank capacity to reflect their amount of reserve autonomy in hours or days . Don't forget to factor losses in efficiency and what state of discharge you wish to gamble. Just my .02

@AltEStore

3 жыл бұрын

You are right, there are several ways to size the system. I usually use a few different methods to sanity check and make sure everything works well together. This example was showing if you wanted to be able to use all of the solar power and not dial it back.

Thanks

Lead-carbon versus LiFePO4? Any advice?

Hi Amy could I use a Growatt SPF 3000TL LVM-ES 3kW 120V inverter with the KILOVAULT HAB 7.5KWH V3?

@AltEStore

3 жыл бұрын

If it is 48V, you sure can. That'd be a nice combination, clean install. Note that the HAB max charge rate is 50A, and the GroWatt max PV charging is 80A. So you'll want to either limit the charging rate or have 2 HABs.

What max charge current should be used for an AGM 660ah battery park?

@AltEStore

3 жыл бұрын

It depends on the manufacturer. Many AGM companies recommend a max of C6, so that would be 660Ah / 6 = 110A.

Any thoughts on lead-carbon batteries? Thanks Amy - legend

@AltEStore

3 жыл бұрын

Big fan of them. The KiloVault PLC battery we use in the example is lead carbon.

@1John5-12

3 жыл бұрын

Thanks. Take care Amy. Your health seems to be fragile

what is the charging current for 2 strings of 4x 230 ah lead acid tubullar batteries ,,is it enough 40 amps ? for c 20 ?

@AltEStore

2 жыл бұрын

It depends on the recommended charge rate for your batteries, but usually between a C/6-7 is ideal. Contact the manufacturer for definitive answer. If you plan a C/7 rate, then (8 x 230Ah) / 7h = 263A A 40A charge is therefore less than 1/6 the ideal charge rate (C/46)

You don’t explain the voltage of the arrays or syst3m until later in the video. Very confusing

I have a battery, agm 50Ah 12V, from China, and cannot find the C rate. Is this something you can only get from the manufacturer, or is there an alternative way?

@AltEStore

2 жыл бұрын

The standard C rate we usually design around for lead acid batteries is a C/6 to C/8, which effectively means a 3-4 hour discharge rate at max. For 50Ah battery, this would mean 75-100W total load (50Ah x 12V / 6h or 8h).

@geelee1977

2 жыл бұрын

@@AltEStore I think I likely do not understand these concepts. I am wanting to make sure I do not charge my battery too fast. So I'm trying to find the maximum charge current. I am guessing, that there are only 2 ways for me to find that: 1) from the manufacturer 2) do my own testing Am I understanding this right?

@AltEStore

2 жыл бұрын

Yes I should have stated it that way in my reply, but it goes both ways for charging AND discharging. 100W is the maximum charge input to remain under a C/6 charge rate.

lithium cheap now when it comes to kwh cost also 1/3 weight repairable as in buy new cell or bms they live forever lead is dead

Good God we haven't seen you for ages ! You have gone gray.. !!!

@benjaminreyes2389

3 жыл бұрын

Getting old Amy.

Where is the beautiful golden hair and marvellous figure? ... No no you have to go to the hair dresser and back to the gym ..

@AltEStore

3 жыл бұрын

Quarantine has been rough on everyone.

@TheWickerShireProject

3 жыл бұрын

@@AltEStore (Face Palm ) Handling comments like a champ! Oh this crowd... sigh... Btw thanks for being the Greatest Local Alternate energy Company Warehouse ever!