Charge 52V Dolphin with this MPT-7210A?

Batteries, Chargers, and Battery Management Systems.
Post Reply
Stu Summer   10 W

10 W
Posts: 98
Joined: Apr 27 2016 8:01pm
Location: Hillsdale, NY

Charge 52V Dolphin with this MPT-7210A?

Post by Stu Summer » Jun 15 2017 7:57pm

MPPT.jpg
MPPT.jpg (85.3 KiB) Viewed 2722 times
Can I charge my Luna 52V Dolphin pack with a 285W solar panel by using this MPPT Solar Charge Controller set at, say, 56V or 52V? Will it damage the battery?

Thanks, I'm pretty wet behind the ears.

Stu Summer
2013 DB Haanjo Commuter with BBSHD and Zzipper fairing
Marin Rift Zone FS with BBSHD
Kysmo "lab" bike with 350w hub motor
Ryan Vanguard recumbent LWB with a 36v Cyclone 350w middrive and a 56v MAC 5t in the front hub.

User avatar
Sunder   100 MW

100 MW
Posts: 2859
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Sunder » Jun 15 2017 8:54pm

Should be fine. Just make sure you use the current limiting function, if your battery can't handle the 5-6amps that the solar panel can put out.

I have one of those to charge a a 24v battery. Difference is though, my battery is 130Ah, so could soak up anything my solar panels could throw at it.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

kdog   10 kW

10 kW
Posts: 613
Joined: Feb 02 2014 9:22pm
Location: hobart, tasmania

Re: Charge 52V Dolphin with this MPT-7210A?

Post by kdog » Jun 16 2017 6:41am

the main thing is that you need to know the exact voltage to charge to.
given by #cells x 4.2v for li-ion and #cells x 3.6v for lifepo4
what is the configuration of the luna battery?
im guessing its a 14 cell li-ion so its max charge is 58.8v
this is an absolute max. if you accidently charge above that to say 63v you will have destroyed your battery and may have a potential fire on your hands at some stage (maybe down the track)
you can undercharge but the BMS wont balance until nearly full.
can you set V accurately on your MPPT charger? 56 or 52 is nowhere near accurate enough
k

User avatar
Sunder   100 MW

100 MW
Posts: 2859
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Sunder » Jun 16 2017 10:58am

kdog wrote:the main thing is that you need to know the exact voltage to charge to.
given by #cells x 4.2v for li-ion and #cells x 3.6v for lifepo4
what is the configuration of the luna battery?
im guessing its a 14 cell li-ion so its max charge is 58.8v
this is an absolute max. if you accidently charge above that to say 63v you will have destroyed your battery and may have a potential fire on your hands at some stage (maybe down the track)
you can undercharge but the BMS wont balance until nearly full.
can you set V accurately on your MPPT charger? 56 or 52 is nowhere near accurate enough
k
Those controllers can be set to 100th of a volt. How accurate they really are are another matter entirely.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

User avatar
tomjasz   10 GW

10 GW
Posts: 4208
Joined: Mar 29 2014 1:45pm
Location: Out riding, MN USA
Contact:

Re: Charge 52V Dolphin with this MPT-7210A?

Post by tomjasz » Jun 22 2017 10:43pm

Do you already own the charger? I have a new unused for a discounted price...

BTW there a couple of good videos, one from a Brit that works out the kinda crazy setting details.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

forsa355   1 µW

1 µW
Posts: 4
Joined: Sep 14 2017 10:09pm

Re: Charge 52V Dolphin with this MPT-7210A?

Post by forsa355 » Oct 18 2017 7:34pm

if this charger is so cheap ($44 on Amazon), how come more people don't use this as a cheap alternative to a Cycle Satiator? Seems to do similar thing (albeit without the bells and whistles). Hook up a cheap 12v wall wart you may have kicking around to power it, and you have full control over max charge voltage and charging amperage.

Is anyone using it for this purpose? I'd love to get one to charge a 52v shark pack to 80%, 90% etc. at home.

Amazon link: https://www.amazon.com/Docooler%C2%AE-B ... =MPT-7210a

User avatar
Sunder   100 MW

100 MW
Posts: 2859
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Sunder » Oct 18 2017 9:34pm

The specs on these chargers are exaggerated.

I had a 14.8v, 150A capable power supply on one side, and a very low resistance 24v battery on the other side. It couldn't even push 2A.

Also, some sellers say that it's MPPT. Thats crap. If the input side voltage goes above the output voltage, it just passes the voltage through, which can overcharge the battery.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

heathyoung   1 MW

1 MW
Posts: 1545
Joined: May 27 2009 2:01am
Location: Newcastle, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by heathyoung » Oct 24 2017 9:18pm

Its a boost converter MPPT - if input > output, then this will happen normally.

There has been quite a bit of testing with these, and people are reporting decent power, 4-500W.
GNG offroad build on Craftworks DHR with 12S2P lipo. Light, balanced, powerful, able to climb a tree.
Project Vectrii (2) - status - Finished. Nope. 38S Leaf cells are next. Now have 2 of them - Averages 50Wh/Klm

User avatar
Sunder   100 MW

100 MW
Posts: 2859
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Sunder » Oct 25 2017 5:06pm

Hmm. Mine was advertised as a "MPPT Buck and Boost Controller"

I read that as (MPPT Buck) + Boost, as I didn't think MPPT boost existed. I still expected it to control charge voltage both directions though.

Still doesnt explain why I can only get 2A boost out of it. I wonder if the originals were such good value for money that there are cheap knock offs already.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

User avatar
Sunder   100 MW

100 MW
Posts: 2859
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Sunder » Nov 07 2017 9:15pm

Alright, I am an idiot.

After what Heath said, I retested my system. The issue is a 15m cable using 1mm^2. That is rated to 11A depending on the conductor, but at 10A, the voltage drop over the whole length is 2.55v, The battery is only "seeing" a lower voltage, hence lower potential difference between battery and charger, and lower charge rate.

I've unfairly maligned this charger. My apologies.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

jumpjack   100 W

100 W
Posts: 195
Joined: Apr 11 2011 6:16am

Re: Charge 52V Dolphin with this MPT-7210A?

Post by jumpjack » Oct 11 2019 7:26am

Is there any tutorial/manual for this regulator? I read it is also for lithium, but cant find any screenshot showing charge curve or battery type.

Hillhater   100 GW

100 GW
Posts: 10671
Joined: Aug 03 2010 10:33pm
Location: Sydney ..(Hilly part !) .. Australia/ Down under !

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Hillhater » Oct 19 2019 5:14pm

Sunder wrote:
Nov 07 2017 9:15pm
I've unfairly maligned this charger. My apologies.
Sunder, can you give an update on the 7210A..
Is it still working reliably ?
Does it stop the charge when a min current level is reached, or is it just time based ?
Are you still running it from a power supply , rather than solar ?
Any other problems with it to date ?
Thanks
This forum owes its existence to Justin of ebikes.ca

User avatar
Sunder   100 MW

100 MW
Posts: 2859
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Sunder » Oct 21 2019 10:01pm

Hey mate,

It's been a while since I had that in production. I've taken a very different approach as to how to do this. (I ended up stepping up the 14.8vdc to 240vac, transmitting it to a normal battery charger, stepping it back down to 24vdc - less efficient, but much faster charging).

In answer to your question:

1. Don't know, I repurposed it about 6 weeks ago, so it still works, but it probably has been out of action for a year between then.

2. It's strictly a CC/CV charger with no smarts. You set the max voltage, and once it hits it, it will stay on passing zero current. If you drain the battery, it starts running again. Note that if the input voltage ever exceeds the battery voltage, it's just passed through, so there is no overcharge protection.

3. The power supply is the Traction Battery to Accessory battery of my Outlander PHEV. Yes, it's a $50k generator on wheels :P

4. Aside from the fact it's pretty noisy for my current purpose? Not really.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

Hillhater   100 GW

100 GW
Posts: 10671
Joined: Aug 03 2010 10:33pm
Location: Sydney ..(Hilly part !) .. Australia/ Down under !

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Hillhater » Oct 21 2019 11:01pm

Thanks S
Im on the hunt for a portable bulk charger that can handle 10s,15s, 18s occasionally without too much reconfiguring.
The 7210A looks like a possibility
This forum owes its existence to Justin of ebikes.ca

Cephalotus   10 kW

10 kW
Posts: 657
Joined: Jun 18 2012 12:27pm

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Cephalotus » Oct 31 2019 7:08am

If you want it to use with a solar panel:

It does NOT have an MPP tracker. MPP tracking is just a fake. I tries to reach the power you set it to and tan works at that level as a boost charger (outside the MPP) and if there is a shadow or something else it stops working.

At lwast this is how my thing works.

input current is limited to 10A and you better think about better cooling.

Genasun makes good solar boost chargers with real MPP tracking, but they are significantly more expensive (and the max Voltage is fixed)

Hillhater   100 GW

100 GW
Posts: 10671
Joined: Aug 03 2010 10:33pm
Location: Sydney ..(Hilly part !) .. Australia/ Down under !

Re: Charge 52V Dolphin with this MPT-7210A?

Post by Hillhater » Oct 31 2019 8:33am

No intention of powering from solar. Intend to use a 24v power supply.
I need the ability to change 36, 48, 52, volt charge level simply so those Genasun units wont work for me.
Not many options with that range of charge voltages....none of them perfect !
This forum owes its existence to Justin of ebikes.ca

GIGATT   1 W

1 W
Posts: 60
Joined: Feb 27 2017 2:58pm
Location: Fulshear, TX

Re: Charge 52V Dolphin with this MPT-7210A?

Post by GIGATT » Jan 18 2020 7:17pm

Hillhater wrote:
Oct 19 2019 5:14pm
Sunder wrote:
Nov 07 2017 9:15pm
I've unfairly maligned this charger. My apologies.
Sunder, can you give an update on the 7210A..
Is it still working reliably ?
Does it stop the charge when a min current level is reached, or is it just time based ?
Are you still running it from a power supply , rather than solar ?
Any other problems with it to date ?
Thanks
I can get 400 watts out of my 7210A depending on how low the 36volt batteries are.

Post Reply