A few months back I bought an electric car, as well as an EVSE to recharge it at home. I ended up buying a e-motorwerks JuiceBox 40Amp unit with an Arduino chip in it for monitoring charging specifications.Some back round... my car is a 2015 VW e-Golf. It has a 24.2 kw traction battery. Only 21.1 kw is useable, to protect from overcharging and undercharging, both hard on battery life. I did go with the 7.2kwh charger on board, as well as DC fast charge plug, which goes into a DC charge machine capable of 50 kwh at 300- 480Volts, capable of 20 to 30 minute charging at 80 and 90% respectively... again that last 10% when cramming in the electrons fast is problematic, it generates heat, and heat is bad for the Li ion cells.What I believe might be of interest is the charging curve shown as logged by the Arduino unit and software that come with the Juice Box 40 Pro, because it will relate to how Lithium batteries recharge in an RV environment. So here's the graph.Input is 242V to 239V during charging, amperage is 30 amps. The last 20 minutes of charging is lucky to add 1 kw of electricity to the charge controller. The rest of the time, it's adding at 7.2 kw to the charge controller.What this means, to you, the RV owner is that absorption charging time is highly minimized. Most all of your time can be spent bulk charging quickly, if you have the amperage capacity to do so.If someone can advise me on how to pull down that CSV file ( I assume it's raw data), I'd be glad to post it up.

Kudos Señor Niner!I need to find that elusive Swami on a Tibetan mountaintop who will dole out special seeds. The ones that grow into a small tree yielding fresh hundred dollar bills. Something tells me really good lithium batteries will never be cheap unless a government heavily subsidizes their manufacture (Like China). Sadly I'll never last to see this...

MEXICOWANDERER wrote:Kudos Señor Niner!I need to find that elusive Swami on a Tibetan mountaintop who will dole out special seeds. The ones that grow into a small tree yielding fresh hundred dollar bills. Something tells me really good lithium batteries will never be cheap unless a government heavily subsidizes their manufacture (Like China). Sadly I'll never last to see this...You never know when some left over lithiums might fall into your hands. That smart phone was just a little taste of high density energy for you.VW is warrantying that the battery will live 8 years or 100,000 miles, which ever comes first, and still maintain 70% of capacity. Time will tell how that plays out. Other question, like always asked here, is cost to replace the battery.

I suspect my northstar AGM will be my last Lead acid house battery.Only needing at a maximum 65AH overnight, I can get by on 100Ah of Lifepo4 and could get that much for ~660$ for the 4 cells. BMS and packaging of the prismatic cells extra, and the alternator will likely protest at being maxed out practically always.Would be nice to know if the 2000 claimed cycles are achievable. If so it would be cheaper than AGM.

"Would be nice to know if the 2000 claimed cycles are achievable. If so it would be cheaper than AGM" It's a shame the USA Federal Trade Commission was turned into a gelding"So a person tests a product to see if it lives up to hot air and hyperbole. And it fails miserably. 410 cycles, not two thousand. What's a person going to do about it? Nothing, of course. Unless OEM puts their money where their mouth is, with a stipulated warranty, cycle life claims are not worth the electrons they consist of. This is where products need to be rated, Amazon style. By consumers. Toss out shill posts and Hale Bop crackpot remarks and beneath the boiling surface reality lurks. Hmm. I wonder what Ooze Battery did with those bars of Strontium they used as an additive to make their Miracle Paste? I love those Amazon Touts for hyper-promoted products "We Floats Like a Butterfly But We Stings Like A Bee". Followed by a 1-1/2 star rated customer reviews."Best tires I have ever bought!" brags the 80-year old pushy loudmouth. "Fabulous mileage and ride comfort!" He forgets to mention he averages 129-miles a year on the odometer.PS: These remarks have -nothing- to do with Niner Bikes and his posts

I hope these early lithium batteries sized for RV use do better life-wise than the little lithium batteries in my various electronic gadgets (computer, cell phone, Garmin navigator, etc.). It seems like I'm "always" having to replace the lithium batteries in these ... it's a good thing I can get the replacements for them in the $20-$100 range.What we need (finally) is battery technology that acts like an air capacitor ... just sits there ready to deliver whatever energy is left in it regardless of state-of-charge - and can do this over and over and over forever including taking it to zero charge as many times as you want ... and can be recharged at any amperage so long as arc-over voltage is not exceeded ... and is at least as small as Group 31 size. Ooooh I almost forgot ... we gotta be able to afford it and lift it.Since we'll never see the above - an affordable small propane powered fuel cell for RV's would be a good substitute.

Going Lithium batteries? Charging profile revealed.

NinerBikes
Explorer
Feb 27, 2016
pnichols wrote:
I hope these early lithium batteries sized for RV use do better life-wise than the little lithium batteries in my various electronic gadgets (computer, cell phone, Garmin navigator, etc.). It seems like I'm "always" having to replace the lithium batteries in these ... it's a good thing I can get the replacements for them in the $20-$100 range.

What we need (finally) is battery technology that acts like an air capacitor ... just sits there ready to deliver whatever energy is left in it regardless of state-of-charge - and can do this over and over and over forever including taking it to zero charge as many times as you want ... and can be recharged at any amperage so long as arc-over voltage is not exceeded ... and is at least as small as Group 31 size. Ooooh I almost forgot ... we gotta be able to afford it and lift it.

Since we'll never see the above - an affordable small propane powered fuel cell for RV's would be a good substitute.

Charge your lithium batteries to only 90% SOC and they will last a lot longer. So many people want that last 10% or performance, which is hard on lithium batteries. Leave the last 10 to 15% in there also. Always keep above 3.0V and charge to 4.1V, max not 4.2V.
pnichols
Explorer II
Feb 27, 2016
I hope these early lithium batteries sized for RV use do better life-wise than the little lithium batteries in my various electronic gadgets (computer, cell phone, Garmin navigator, etc.). It seems like I'm "always" having to replace the lithium batteries in these ... it's a good thing I can get the replacements for them in the $20-$100 range.

What we need (finally) is battery technology that acts like an air capacitor ... just sits there ready to deliver whatever energy is left in it regardless of state-of-charge - and can do this over and over and over forever including taking it to zero charge as many times as you want ... and can be recharged at any amperage so long as arc-over voltage is not exceeded ... and is at least as small as Group 31 size. Ooooh I almost forgot ... we gotta be able to afford it and lift it.

Since we'll never see the above - an affordable small propane powered fuel cell for RV's would be a good substitute.
MEXICOWANDERER
Explorer
Feb 27, 2016
"Would be nice to know if the 2000 claimed cycles are achievable. If so it would be cheaper than AGM"

It's a shame the USA Federal Trade Commission was turned into a gelding"

So a person tests a product to see if it lives up to hot air and hyperbole. And it fails miserably. 410 cycles, not two thousand. What's a person going to do about it? Nothing, of course. Unless OEM puts their money where their mouth is, with a stipulated warranty, cycle life claims are not worth the electrons they consist of. This is where products need to be rated, Amazon style. By consumers. Toss out shill posts and Hale Bop crackpot remarks and beneath the boiling surface reality lurks.

Hmm. I wonder what Ooze Battery did with those bars of Strontium they used as an additive to make their Miracle Paste? I love those Amazon Touts for hyper-promoted products "We Floats Like a Butterfly But We Stings Like A Bee". Followed by a 1-1/2 star rated customer reviews.

"Best tires I have ever bought!" brags the 80-year old pushy loudmouth. "Fabulous mileage and ride comfort!" He forgets to mention he averages 129-miles a year on the odometer.

PS: These remarks have -nothing- to do with Niner Bikes and his posts
landyacht318
Explorer
Feb 27, 2016
I suspect my northstar AGM will be my last Lead acid house battery.

Only needing at a maximum 65AH overnight, I can get by on 100Ah of Lifepo4 and could get that much for ~660$ for the 4 cells. BMS and packaging of the prismatic cells extra, and the alternator will likely protest at being maxed out practically always.

Would be nice to know if the 2000 claimed cycles are achievable. If so it would be cheaper than AGM.
NinerBikes
Explorer
Feb 27, 2016
MEXICOWANDERER wrote:
Kudos Señor Niner!

I need to find that elusive Swami on a Tibetan mountaintop who will dole out special seeds. The ones that grow into a small tree yielding fresh hundred dollar bills. Something tells me really good lithium batteries will never be cheap unless a government heavily subsidizes their manufacture (Like China). Sadly I'll never last to see this...

You never know when some left over lithiums might fall into your hands. That smart phone was just a little taste of high density energy for you.

VW is warrantying that the battery will live 8 years or 100,000 miles, which ever comes first, and still maintain 70% of capacity. Time will tell how that plays out. Other question, like always asked here, is cost to replace the battery.
MEXICOWANDERER
Explorer
Feb 27, 2016
Kudos Señor Niner!

I need to find that elusive Swami on a Tibetan mountaintop who will dole out special seeds. The ones that grow into a small tree yielding fresh hundred dollar bills. Something tells me really good lithium batteries will never be cheap unless a government heavily subsidizes their manufacture (Like China). Sadly I'll never last to see this...

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