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12vdc charger for 4s lifepo4 portable battery
#11
Turnigy usually doesn't make their own chargers, they are instead based on SkyRC or Junsi or other OEM units. This is pretty normal for the charger industry, it's a huge OEM business.
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#12
Good to know. How is the quality?
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#13
As far as I know there is nothing to worry about. I think it's fair to say that they are decent.
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#14
thanks!
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#15
So I came across this victron product recently. I thought that I would share it here. This is essentially was I was looking for earlier this year. I ended up with a RC charger which is nice because it can balance charge.

Had I found this I would have gone this route!

https://www.victronenergy.com/dc-dc-conv...tr%20smart
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#16
You could consider an appropriately sized DC-DC that has CC/CV modes… at least that’s how I charge from my cars 12v port.  I have a fridge in the truck a 24v battery pack for it which charges while the truck is running.  The pack is top balanced but the BMS is in case I have problems.

That said, I love RC / hobby chargers too.  I use them to charge and maintain many packs I build.

(10-02-2019, 05:58 AM)gpn Wrote: So I came across this victron product recently. I thought that I would share it here. This is essentially was I was looking for earlier this year. I ended up with a RC charger which is nice because it can balance charge.

Had I found this I would have gone this route!

https://www.victronenergy.com/dc-dc-conv...tr%20smart

Those are awesome units ... that's pretty much what I use (Victron Orion 12/24-10 step up DC-DC)

I never mention them because people generally dont want to spend the money on it and opt for the chinese stuff.  The non-isolated ones are great too for battery charging, and you save a few bucks in the process.
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#17
What DC/DC with CC/CV do you use? I'd check it out!
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#18
it's a 4S LiFePo4, just hook it straight to the 12v outlet and let it charge...

That's the beauty of LiFePo4, provided those cells aren't totally mismatched it should stay in balance and the voltages are a perfect match for a 12v automotive system.
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#19
(10-03-2019, 07:35 AM)HughF Wrote: it's a 4S LiFePo4, just hook it straight to the 12v outlet and let it charge...

That's the beauty of LiFePo4, provided those cells aren't totally mismatched it should stay in balance and the voltages are a perfect match for a 12v automotive system.

Agreed... for LiFePO4, I would just top balance the cells and let it charge out of the 12v outlet.  That said, if you start blowing car fuses you might want to get something to limit current for charging.

(10-03-2019, 03:15 AM)gpn Wrote: What DC/DC with CC/CV do you use? I'd check it out!

For most of those boards, I was using the DROK branded Chinese PCBs.  Google "dc-dc cc cv buck boost converter" should give you some options.  I ran a few of them in parallel to get the current I wanted and to keep the heat down because I dont trust them not to eventually burn out or catch on fire.

That said, I much prefer the Victron units.  10a is plenty of charge rate so I just size the unit based on the max charge rate I want.  Check the manual, it allows for three step charging, bulk/absorbtion/float and the bluetooth models allow for setting management via a GUI.  The other units I have used are pretty nice too.  I also trust them to handle the advertised current continuous a lot more than the import PCBs.

That said, I am using these to step up from 12 to 24v for lithium charging.
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#20
I like the idea of using a dc-dc so I don't need to worry about the fusing situation. Not all cars have the same 12v output. Are you just using the victron orion tr? I really like blue stuff. I'm going to be ordering my 3rd mppt shortly.

My pack is only 450wh or so so 10a (~140w) of charge is plenty for me as well.
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