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SFK Sun Fun Kits 300ah Battery Review

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Rocksnsalt

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I’m no expert but this seems like an impressive battery for the form factor.
Has all the goodies:
Internal heat that can be controlled externally.
200amp discharge rate
Tested over 4kwh
Bluetooth

 
I have there kits, very nice and work well, If you don't mind building you can save a good bit buying the kit version instead, about $275.00-$300.00.

I also picked up 66 cells form them and 2 lv6548 that will go into my cabin in Arkansas.

There is a guy named Brad Cagle I think he is a member of the forums he did a review on them too:
 

Looks consistent, 4KW and 310ish AH, expensive but looks to be delivering. I would say you are paying for form factor more than anything.
 
Alkaline said:

Looks consistent, 4KW and 310ish AH, expensive but looks to be delivering. I would say you are paying for form factor more than anything.
Click to expand...
Form factor is very important to me, since I’m considering these for my Sprinter van, and also for an off grid shop / adu.

But I haven’t seen any other battery with as many features, regardless of size. Some have 200a discharge, and maybe internal heat, this is the first I’ve seen with an external heater control.
I’m liking the trend!
Anyone else also like to see what they can come up with for a 12v, 24v, and 48v / 5.12kwh -ish battery?
 
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Sam Cho TX said:
I have there kits, very nice and work well, If you don't mind building you can save a good bit buying the kit version instead, about $275.00-$300.00.

I also picked up 66 cells form them and 2 lv6548 that will go into my cabin in Arkansas.

There is a guy named Brad Cagle I think he is a member of the forums he did a review on them too:
Click to expand...
Wow.
Did you get all the features this battery has for 275-$300?
Example:
4kwh
200a bms
internal heaters
external heater control
 
:) You misunderstood me.

I'm saying you can get the same thing form the Same company for less:

SFK V4 280 - 304 AH Kit Thermal Heated Ready to Build (BMS, CELLS, HEATING, & CASE) - Ready to go kit with integrated heating elements as well as all items needed to build a battery Kit for RV, Back up Power / Stand by power or power walls using Cer

SFK V4 280 - 304 AH Kit Thermal Heated Ready to Build (BMS, CELLS, HEATING, & CASE) - Ready to go kit with integrated heating elements as well as all items needed to build a battery Kit for RV, Back up Power / Stand by power or power walls using Certified Automotive Grade EVE LF304 or LF280K...
www.sunfunkits.com

V4 kit with heater switch and 304 cells = 300AH SFK battery, but $275.00 less Only thing is you have to assemble it yourself and the warranty is 2 years vs 8 years.

However, I generally don't trust warranties, companies always figure out a way to not honor them.

BTW I spent almost $20,000.00 with SFK so far, great people to work with.
 
Sam Cho TX said:
:) You misunderstood me.

I'm saying you can get the same thing form the Same company for less:

SFK V4 280 - 304 AH Kit Thermal Heated Ready to Build (BMS, CELLS, HEATING, & CASE) - Ready to go kit with integrated heating elements as well as all items needed to build a battery Kit for RV, Back up Power / Stand by power or power walls using Cer

SFK V4 280 - 304 AH Kit Thermal Heated Ready to Build (BMS, CELLS, HEATING, & CASE) - Ready to go kit with integrated heating elements as well as all items needed to build a battery Kit for RV, Back up Power / Stand by power or power walls using Certified Automotive Grade EVE LF304 or LF280K...
www.sunfunkits.com

V4 kit with heater switch and 304 cells = 300AH SFK battery, but $275.00 less Only thing is you have to assemble it yourself and the warranty is 2 years vs 8 years.

However, I generally don't trust warranties, companies always figure out a way to not honor them.

BTW I spent almost $20,000.00 with SFK so far, great people to work with.
Click to expand...
Ahh apparently I did misinterpret your meaning. Doh!
$275 less being the key word for me.

Thanks for the info and good to hear your experience with SFK has been solid.
 
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Another reason why the kits make more sense, you can get the 150a and its rated for the same continuous. I think do this more for temperature reasons then the BMS itself, You could probably do 200a constant if it wasn't in a case but had open airflow.

On my v3.5 kit with 280K I noticed it get up to 127F during a 130 amp draw for 20 mins, quite certain it would have kept rising, probably not good for the cells.
 
Alkaline said:
I doubt anyone is going to find a plastic battery that can do 200A without turning into an oven, remember this video:


At these high amps it would need some serious cooling.
Click to expand...

I do remember that video and skipped through it again, yeah it got 150f in some areas but that was pretty extreme duty… and it didn’t fail.
I wouldn’t want to subject a battery that size (both form and AH) to that amp draw regularly.
 
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Sam Cho TX said:
Another reason why the kits make more sense, you can get the 150a and its rated for the same continuous. I think do this more for temperature reasons then the BMS itself, You could probably do 200a constant if it wasn't in a case but had open airflow.

On my v3.5 kit with 280K I noticed it get up to 127F during a 130 amp draw for 20 mins, quite certain it would have kept rising, probably not good for the cells.
Click to expand...
Re 127F In what ambient temp? And I agree not good for cells is probably right.

I’m thinking the 1500w continuous rating may be limited by design due to the small case, to reduce the chance of overheating?
Most 300ah batteries being in a considerably bigger case.
 
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I like the compactness of the battery so the trade off thermal is fine, the other Ampere time and Chins stuff just use 8 cells vs 4 I'd recon they would get pretty hot at 1500w load, I don't think I would be using 1 battery if you are needing 1500 on a regular basis, 2 would make the most sense if you are planning on pulling 1500w continuously.

the 200A is probably if you need to start up a coffeemaker for a bit, I would not be looking at this to run 200A for the entire time, in fact I would say 100-120a continuous is really all you should be looking as many people recommend under .3c-.4c for the longest life.
 
Can someone clear up the operation of 2 x 260 ampHr LFP batteries with say 125 vs 200 amp BMS works in one’s daily RV operations? Should one upgrade from a 125 BMS to a 200 (or more) amps BMS? What are the limitations and/or benefits of lower and higher BMS other than the rate of amps one can draw? For instance, will it impact one’s use of running a fridge or other high draw appliance for any extended time?
 
I just saw this and well this is ridiculous: 280AH cells that are putting out 298AH under a 80amp test:

$950 battery with bluetooth and low temp...

I'm actually now a bit depressed my LF280K grade A can't even hit 280AH. Something is wrong with the LF280K, this company EVE should issue a recall.
 
Heya, OP... any thoughts on your build after you've had a few months and hopefully cycles on it? I'm looking at building something similar for an overlanding build, but fear height might be a bit tight... on the other hand, really like how durable/isolated the BMS looks on these SFK setups, which is also pretty paramount for mobile applications, especially where off-roading is part of the build intent.

My thought on a compromise to save a little cash is going with their $160 "24V" box, and sourcing the BMS and blanket heaters separately from Alibaba, which would put me at ~$267 shipped for a SFK w/Bluetooth/heat/BMS. Thanks!
 
Looks like you can get a 12v with heating for 195.00

SFK V4 Basic 12v Heated 280 - 310 AH Basic Kit BYOD (CASE & Enclosure) with heating! - Battery Kit for RV, Back up Power / Stand by power or power walls using Certified Automotive Grade EVE LF304 or LF280K Cells. Sunfunkits.com

SFK V4 Basic 12v Heated 280 - 310 AH Basic Kit BYOD (CASE & Enclosure) with heating! - Battery Kit for RV, Back up Power / Stand by power or power walls using Certified Automotive Grade EVE LF304 or LF280K Cells. Sunfunkits.com
www.sunfunkits.com

Probably can get a dc-dc down converter to run it with 24v.

Or could probably string those pads to run in 24v at half the amps.
 
Alkaline said:
Looks like you can get a 12v with heating for 195.00

SFK V4 Basic 12v Heated 280 - 310 AH Basic Kit BYOD (CASE & Enclosure) with heating! - Battery Kit for RV, Back up Power / Stand by power or power walls using Certified Automotive Grade EVE LF304 or LF280K Cells. Sunfunkits.com

SFK V4 Basic 12v Heated 280 - 310 AH Basic Kit BYOD (CASE & Enclosure) with heating! - Battery Kit for RV, Back up Power / Stand by power or power walls using Certified Automotive Grade EVE LF304 or LF280K Cells. Sunfunkits.com
www.sunfunkits.com

Probably can get a dc-dc down converter to run it with 24v.

Or could probably string those pads to run in 24v at half the amps.
Click to expand...

Solid ideas... Renogy's *brand* spanking new DC-DC charger/MPPT I've ordered supports 24V, but I'm wondering if the benefits are worth 24V instead of just wiring it up as 4s2p...
 
Interesting changes to the newer model:


Looks like it now has Victron comms and active balancer control as well as manual heating. One of the guys locally just got 2 of the 275ex models so I'll have to check it out. Its priced exactly the same as the Epoch 300 ah with comms once you add shipping.
 
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