Professional Charging batteries out in the field

Joined
Sep 14, 2015
Messages
51
Reaction score
37
Location
Sweden
I need to charge my batteries out in the field. First I was think about a gasoline generator with a output of 1000w. Those are not that heavy and they offers more than enough with juice. The other solution would be a 12V lithium battery (LiFEPO4) battery with ~60Ah. No need to mess with gas and completely quite. Being a lithium battery I can use all the power without damaging the battery. I’m planning to connect a 200-300W inverter and then the battery charger for the Phantom.

How many batteries (P3, 4.48Ah, 68Wh, 15.2V) would I be able to charge with a 12V 60Ah battery?
 
Joined
Jan 4, 2016
Messages
7,813
Reaction score
3,074
Location
Australia
Just under 7 full charges.

Assuming source battery drained to 80% DOD with inverter and charger efficiencies at 85% (LiFePO4 have a nom cell voltage of 3.25v).

300w inverter may be light on, especially if Chinese origin. I would go for 600w sine wave inverter for reliability.
 
Joined
May 19, 2015
Messages
373
Reaction score
139
Age
59
I seem to renumber seeing that you need a pure sine wave inverter. Of course they're more expensive..
 
Joined
Sep 14, 2015
Messages
51
Reaction score
37
Location
Sweden
Just under 7 full charges.

Assuming source battery drained to 80% DOD with inverter and charger efficiencies at 85% (LiFePO4 have a nom cell voltage of 3.25v).

300w inverter may be light on, especially if Chinese origin. I would go for 600w sine wave inverter for reliability.
Thanks for the input. I will not buy any cheap inverter. But why are you counting with 80% DOD? LiFePO4 batteries can be used to 100% or close to 100% right?
 
Joined
May 10, 2015
Messages
3,622
Reaction score
870
Age
76
Location
San Antonio, TX
Thanks for the input. I will not buy any cheap inverter. But why are you counting with 80% DOD? LiFePO4 batteries can be used to 100% or close to 100% right?
Not right:)
 
Joined
Jan 4, 2016
Messages
7,813
Reaction score
3,074
Location
Australia
Thanks for the input. I will not buy any cheap inverter. But why are you counting with 80% DOD? LiFePO4 batteries can be used to 100% or close to 100% right?
It depends what service life/cycle count you would hope to get. Screw every last bit of juice out of them and get less cycles. 20% is a good compromise.
 
  • Like
Reactions: AndersE and BigAl07
Joined
Jan 4, 2016
Messages
7,813
Reaction score
3,074
Location
Australia
As I read it, you are at around $500 for that battery. Why not go with a deep cycle battery?
About $450 AU without balancing circuits and terminal hardware. Advantage is a lot less weight and you can't take lead acid (deep cycle or not) much below 50% without greatly reducing life. I rely on batteries to keep my beer cold in the bush.
 
Joined
Jan 29, 2015
Messages
4,849
Reaction score
2,056
Location
Salt Lake City, UT
About $450 AU without balancing circuits and terminal hardware. Advantage is a lot less weight and you can't take lead acid (deep cycle or not) much below 50% without greatly reducing life. I rely on batteries to keep my beer cold in the bush.
$450 and get 7 cycles. I'd either go deep cycle, 4 cycle generator or 3 more batteries. I'd even charge off a running vehicle before I'd spend another $450.

I bought an 4 cycle 800 watt generator off Amazon for $240. It's just a little louder then the Yamaha or Honda. Runs 6 hours on a gallon of gas. It does take longer to charge batteries but it works just fine. I suspect a lithium battery as mentioned would take longer t charge as well.
 
Joined
Jan 4, 2016
Messages
7,813
Reaction score
3,074
Location
Australia
$450 and get 7 cycles. I'd either go deep cycle, 4 cycle generator or 3 more batteries. I'd even charge off a running vehicle before I'd spend another $450.

I bought an 4 cycle 800 watt generator off Amazon for $240. It's just a little louder then the Yamaha or Honda. Runs 6 hours on a gallon of gas. It does take longer to charge batteries but it works just fine. I suspect a lithium battery as mentioned would take longer t charge as well.
Will charge just as quick as off the mains if the inverter is good.
 
Joined
Sep 14, 2015
Messages
51
Reaction score
37
Location
Sweden
The thing is that my boat needs a new battery bank and I'm planning to use the lithium battery in the boat when Im done with the aerial videos. If I can charge 7 batteries I will manage with a 60Ah battery.
 
Joined
Jan 3, 2016
Messages
742
Reaction score
302
Age
67
I spent two days camping last week a long ways from 120 volts. I charged my batteries using a 12V plugin into my camper that was using juice from a Group 27 marine battery. I've got a folding 60 watt solar panel that kept my marine battery topped off.

It worked great.
Amazon.com: BTG Car Charger for DJI Phantom 3 Professional Pro Battery: Toys & Games

The charging is controlled, I believe, by the smart circuit in the battery.

SB
 
Joined
Sep 14, 2015
Messages
51
Reaction score
37
Location
Sweden
I spent two days camping last week a long ways from 120 volts. I charged my batteries using a 12V plugin into my camper that was using juice from a Group 27 marine battery. I've got a folding 60 watt solar panel that kept my marine battery topped off.

It worked great.
Amazon.com: BTG Car Charger for DJI Phantom 3 Professional Pro Battery: Toys & Games

The charging is controlled, I believe, by the smart circuit in the battery.

SB
How long time does it take to charge one battery?
 
Joined
Jan 3, 2016
Messages
742
Reaction score
302
Age
67
How long time does it take to charge one battery?
I was using about 50%- 60% of the battery charge and it would be topped off and shut down after about an hour and fifteen.

Generators make my ears ring. The thought of charging in the field with 120 volts to get to 12 volts makes my brain spin and my wallet start to squeel. ; )

SB
 

New Threads

Forum statistics

Threads
134,611
Messages
1,392,562
Members
98,119
Latest member
TCreek