Fastest charger
- Thread starter Albie72
- Start date
What input power levels are you requiring, 120v or 240v?
Do you want stationary or portable charger?
Any specific size you are looking for?
*
Price is no object obviously in your case
You can series some Meanwells, perhaps even the RSP series.
https://www.meanwellusa.com/upload/pdf/RSP-2400/RSP-2400-spec.pdf
Active current sharing up to 7200W (2+1)
43 ~ 56V @ 50a
https://www.digikey.com/en/products/detail/mean-well-usa-inc/RSP-2400-48/7706321
72v is 20s is 84v fresh off the charger, so two in series is 86v so your good to go there.
Even a 3000w rsp model, looks interesting
https://www.meanwell.com/productSearch.aspx
https://www.meanwell.com/webapp/product/search.aspx?prod=RSP-3000
43 ~ 56V @ 62.5a and 20A/180VAC 16A/230VAC
- Output voltage programmable
- Active current sharing up to 9000W (2+1)
- Optional conformal coating
Complete list
https://www.meanwell.com/productSeries.aspx?i=22&c=6#tag-6-22
Other options
https://www.meanwell.com/webapp/product/search.aspx?prod=NPP-1700
https://www.meanwell.com/webapp/product/search.aspx?prod=DBR-3200
*
ELTEK 1.8kW flatpack S
https://endless-sphere.com/forums/viewtopic.php?f=14&t=71139&hilit=charger
EMC-2000
https://endless-sphere.com/forums/viewtopic.php?f=14&t=29096&hilit=charger#p419529
6600w
https://endless-sphere.com/forums/viewtopic.php?f=14&t=52560&hilit=charger
I have heard of people installing DIY EV charging capabilities for commercial EV chargers on their ebikes and emotorbikes.
Might be something to look into.
Do you want stationary or portable charger?
Any specific size you are looking for?
*
Price is no object obviously in your case
You can series some Meanwells, perhaps even the RSP series.
https://www.meanwellusa.com/upload/pdf/RSP-2400/RSP-2400-spec.pdf
Active current sharing up to 7200W (2+1)
43 ~ 56V @ 50a
https://www.digikey.com/en/products/detail/mean-well-usa-inc/RSP-2400-48/7706321
72v is 20s is 84v fresh off the charger, so two in series is 86v so your good to go there.
Even a 3000w rsp model, looks interesting
https://www.meanwell.com/productSearch.aspx
https://www.meanwell.com/webapp/product/search.aspx?prod=RSP-3000
43 ~ 56V @ 62.5a and 20A/180VAC 16A/230VAC
- Output voltage programmable
- Active current sharing up to 9000W (2+1)
- Optional conformal coating
Complete list
https://www.meanwell.com/productSeries.aspx?i=22&c=6#tag-6-22
Other options
https://www.meanwell.com/webapp/product/search.aspx?prod=NPP-1700
https://www.meanwell.com/webapp/product/search.aspx?prod=DBR-3200
*
ELTEK 1.8kW flatpack S
https://endless-sphere.com/forums/viewtopic.php?f=14&t=71139&hilit=charger
EMC-2000
https://endless-sphere.com/forums/viewtopic.php?f=14&t=29096&hilit=charger#p419529
6600w
https://endless-sphere.com/forums/viewtopic.php?f=14&t=52560&hilit=charger
I have heard of people installing DIY EV charging capabilities for commercial EV chargers on their ebikes and emotorbikes.
Might be something to look into.
Albie72 said:
240Vac is required for fast charging.
Your electric cookers and laundry room have appropriate circuits already, but best to get a sparkie to install a new one, at max possible amps
May need to get your connection from the house out to the pole upgraded.
If you want to plug into the power at other peoples' homes, or plain outlets in public locations, then you need a charger that accepts both 110Vac and 240Vac
But on the former, charging will be very slow, like overnight.
To plug into standard EV recharging stations (EVSE) you need to buy a special kit for that, around a grand in addition to your on board charger.
Your electric cookers and laundry room have appropriate circuits already, but best to get a sparkie to install a new one, at max possible amps
May need to get your connection from the house out to the pole upgraded.
If you want to plug into the power at other peoples' homes, or plain outlets in public locations, then you need a charger that accepts both 110Vac and 240Vac
But on the former, charging will be very slow, like overnight.
To plug into standard EV recharging stations (EVSE) you need to buy a special kit for that, around a grand in addition to your on board charger.
liveforphysics
100 TW
john61ct said:
You can buy the female J1772 receptacle side and use a 1.1k Ohm resistor to spoof most stations to close the AC contactor. My DSR used 4 x J1772 receptacles to power its 8x onboard 3.6kW chargers. 24kW charge still seems too slow to charge when you're road tripping long distances.
Personally even to save big bucks, I'd shy away from a "might work" solution.liveforphysics said:
Can you link to proper interface kits for J1772 that are "reasonably" priced?
24kW is certainly faster than I'd have expected.
Two things in life I never do, one is Rush, the other is Hurry...
liveforphysics
100 TW
john61ct said:
https://www.nocoev.com/product/SAE_J1772_Cabled_Socket.htm#gsc.tab=0
Connect 882 ohm resistance plus a diode from Pilot to ground. That makes the station go into charging mode. The station is a "dumb" device that has an open contactor preventing you from drawing AC power to charge, that resistor tells the station to close the contactor, you don't need any further negotiations with the device, it can give you a signal advising you to reduce current, or open its contactor to protect its breaker, but you don't need to listen to that signal if you stay within the stations over-current limit.
Its because of the J1772 stations pathetic 32-40Amp current limits that my bike taps 4 J-plug stations (or a Tesla destination plug).
Its more evidence of the SAE's efforts to delay EV adopting that this infrastructure that you need to tap 3-4 stations of to charge a 15kWh motorcycle battery... Not practical at all to travel long distances by EV with larger batteries tapping single stations.
j bjork
1 MW
I think tesla has stations that can do 250kw?
I suppose that is dc. If you can use that you would probably have the "fastest charger"
I think most dc chargers around here can "only" do 150kw.
I suppose that is dc. If you can use that you would probably have the "fastest charger"
I think most dc chargers around here can "only" do 150kw.
Yeah but what can his battery handle for charging.
Just cause 250kw charge rate is available has no bearing on whether or not the battery the OP has can handle it.
I have no clue on the ev charging stations if you can set the parameters or not.
I would surely love my 52v 15ah battery to take 300a of charge, would mean 3 minute charge from empty to full.
My charger is only 8a, at most that battery can handle 15a or 1c, and if I want a charger for 120v outlet the most I can ever get for a 15a outlet is 21-24a that takes 12a from the wall, which I think might be to much c-rate for charging for my battery at 1.5-2c. The cells are 21700 format, Panasonic NCR21700A Cells, 40A BMS. Would be nice to have it 50 or 60a but my controller is only 35a. It feels as though the battery prices went up, I know I got mine on sale and it must've been $500 at that time, 2-3yrs ago. They got a nice triangle battery selection now, I particularly like this one https://ebikes.ca/shop/electric-bicycle-parts/batteries/52v-23ah-triangle-battery.html Samsung 35E Cells, and 50A continuous BMS circuit. 23ah USD$1,095.00
https://www.eleteks.com/sale-10910151-panasonic-ncr21700a-5000mah-15a-high-drain-3-7v-21700-rechargeable-lithium-ion-batteries-original-21.html
Says it can take 3a, battery is 3p so 9a max charge rate for my battery.
Just cause 250kw charge rate is available has no bearing on whether or not the battery the OP has can handle it.
It would seem to me that an 80a charge rate, or 1c would be norm, if the specs for the lithium cans state you can charge at 1.5 or 2c, then 120a or 160a. Thats getting up there, unless you can split the battery pack, maybe grab some 50a Meanwells for 72v whether you have to series them to get 72v but 50a charge rate means your deep into the 240v wall outlet category.
I have no clue on the ev charging stations if you can set the parameters or not.
I would surely love my 52v 15ah battery to take 300a of charge, would mean 3 minute charge from empty to full.
My charger is only 8a, at most that battery can handle 15a or 1c, and if I want a charger for 120v outlet the most I can ever get for a 15a outlet is 21-24a that takes 12a from the wall, which I think might be to much c-rate for charging for my battery at 1.5-2c. The cells are 21700 format, Panasonic NCR21700A Cells, 40A BMS. Would be nice to have it 50 or 60a but my controller is only 35a. It feels as though the battery prices went up, I know I got mine on sale and it must've been $500 at that time, 2-3yrs ago. They got a nice triangle battery selection now, I particularly like this one https://ebikes.ca/shop/electric-bicycle-parts/batteries/52v-23ah-triangle-battery.html Samsung 35E Cells, and 50A continuous BMS circuit. 23ah USD$1,095.00
https://www.eleteks.com/sale-10910151-panasonic-ncr21700a-5000mah-15a-high-drain-3-7v-21700-rechargeable-lithium-ion-batteries-original-21.html
Says it can take 3a, battery is 3p so 9a max charge rate for my battery.
j bjork
1 MW
The question was not what is the norm, and what charge rate his batteries can take was not specified.
The question was for "fastest charger" for a 72v 80ah pack.
2 or 3c is commonly used in fast charging in cars, so fastest charging would surely be a lot faster.
Something like this can probably take pretty fast charging:
https://hobbyking.com/en_us/turnigy-rapid-8000mah-2s2p-140c-hardcase-lipo-battery-pack-roar-approved.html?queryID=60cffec8a65671cd086bc3223c0c6740&objectID=85643&indexName=hbk_live_products_analytics
250kw/72v = 3472A
With an 80Ah battery that would be about 44c charging, I dont know if that is the fastest. But probably fastest on a vehicle :wink:
The question was for "fastest charger" for a 72v 80ah pack.
2 or 3c is commonly used in fast charging in cars, so fastest charging would surely be a lot faster.
Something like this can probably take pretty fast charging:
https://hobbyking.com/en_us/turnigy-rapid-8000mah-2s2p-140c-hardcase-lipo-battery-pack-roar-approved.html?queryID=60cffec8a65671cd086bc3223c0c6740&objectID=85643&indexName=hbk_live_products_analytics
250kw/72v = 3472A
With an 80Ah battery that would be about 44c charging, I dont know if that is the fastest. But probably fastest on a vehicle :wink:
My battery is rated 5C charge rate (21S100Ah).
But I will stay under 2C with my setup, because I only have a 11kw socket in my garage.
6x Eltek Flatpack2 2kW HE , 3phase and two in series, making 130A amps at 73V and 125A at 84V. Charging up to 87,4V. Weight 12kg.
But I will stay under 2C with my setup, because I only have a 11kw socket in my garage.
6x Eltek Flatpack2 2kW HE , 3phase and two in series, making 130A amps at 73V and 125A at 84V. Charging up to 87,4V. Weight 12kg.
The whole point of control communications with the EVSE is to tell what charge profile to deliver, the vehicle controls, the EVSE just has maximum V&A to offer.
But the kits for doing that DIY are expensive.
...
Good quality batteries not restricted by low-current circuitry like BMS can usually handle 3-4C just fine, minimal reduction in cycle lifespan when they are nice and warm to start with, say beach weather and higher.
Put temp sensors in to cut the charge off (or ideally, reduce current) if temp rises too fast due to the high current charge.
In cold weather you must keep the current rate much lower, or heat the pack first. Too fast in below-freezing temps can render the whole pack instant scrap. Even 1C can be too fast in sweater weather, drastically reducing cycle lifetimes.
These factors vary by specific chemistry used.
LTO can handle 5C even in the cold, recharge to Full in ten minutes, but low energy density...
But the kits for doing that DIY are expensive.
...
Good quality batteries not restricted by low-current circuitry like BMS can usually handle 3-4C just fine, minimal reduction in cycle lifespan when they are nice and warm to start with, say beach weather and higher.
Put temp sensors in to cut the charge off (or ideally, reduce current) if temp rises too fast due to the high current charge.
In cold weather you must keep the current rate much lower, or heat the pack first. Too fast in below-freezing temps can render the whole pack instant scrap. Even 1C can be too fast in sweater weather, drastically reducing cycle lifetimes.
These factors vary by specific chemistry used.
LTO can handle 5C even in the cold, recharge to Full in ten minutes, but low energy density...
floydr
100 W
J1772 Active Vehicle Control Module AVC2 - For Public Charge Stations
[J1772 Contro] $45
https://www.evwest.com/catalog/product_info.php?cPath=35&products_id=107&osCsid=a4854d1b22506452429682a1c92b0223
[J1772 Contro] $45
https://www.evwest.com/catalog/product_info.php?cPath=35&products_id=107&osCsid=a4854d1b22506452429682a1c92b0223
Not if you need to warm up a little bit in the winter, or toast marshmallows. 
:wink:
:wink: