Which is better for running a large inverter?

The Renogy. Its 200A continuous and 400A peak ratings are published, so you can size an inverter against them. Foursun does not publish continuous discharge current, which makes surge planning harder.

Renogy rates 5000 cycles at 80% depth of discharge to 80% end of life. Foursun claims over 4500 cycles without stating the test depth. Both outlast lead-acid by a wide margin.

Is the Foursun worth stepping up to over the Renogy?

Only if you need 300Ah in one case or a submersible IP67 housing. You give up Bluetooth monitoring and a documented high-current BMS to get there.

Can I monitor the Foursun from my phone?

No. It has no Bluetooth or app. Add a shunt-based battery monitor if you want live state of charge.

Can either be wired in series for 24V or 48V?

Both support series and parallel connections. Renogy also supports series-parallel and states compatibility with its older models in the same bank.

Which handles cold weather charging better?

Both have low-temperature charge cutoff in the BMS. Neither should be charged below freezing; the cutoff protects against accidental charging, not against cold capacity loss.

Foursun 12V 300Ah LiFePO4 Battery vs Renogy Core 12V 200Ah LiFePO4 Battery

The Foursun is the pick for maximum capacity in one box: 300Ah, IP67 sealing and low-temp BMS protection in a single battery. The Renogy is the better-engineered unit for most people: Bluetooth monitoring, a true 200A BMS with 400A peak starting current, EV-grade cells and a 5000-cycle rating, backed by 190 ratings averaging 4.8. Build quality and app support favor Renogy; raw amp-hours favor Foursun.

Choose the Foursun if you need the most capacity per battery and a fully sealed IP67 case for a wet or dusty install.
Choose the Renogy if you want Bluetooth monitoring, strong surge current for inverters and a longer cycle rating from a widely reviewed brand.

Prices

Foursun 12V 300Ah LiFePO4 Battery: $299.00 at eBay (checked today)
Renogy Core 12V 200Ah LiFePO4 Battery: $299.00 at Amazon (last seen Nov 9)
Difference: both cost the same at the latest prices (Nov 9 and Nov 10)

Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection

What separates them

	Foursun 12V 300Ah LiFePO4 Battery	Renogy Core 12V 200Ah LiFePO4 Battery
Rated capacity	300Ah	200Ah (2560Wh)
Cycle life	Over 4500 cycles	5000 cycles at 80% DOD to 80% end of life
Monitoring	No Bluetooth or app; status via external shunt or meter	Bluetooth with the Renogy app for live state of charge and cell data
BMS current	Protective BMS with low-temperature cutoff; continuous current not published	True 200A continuous charge and discharge, 400A peak for 10 seconds
Ingress protection	IP67, submersible-rated housing	IP65, dust-tight and water-jet resistant
Weight	Heavier, given the larger cell bank	44.53 lbs (20.2 kg)
Bank wiring	Series and parallel supported per Foursun	Series, parallel and series-parallel, and links to older Renogy models
Owner feedback	Limited independent review base	4.8 of 5 from 190 ratings; complaints about shipping delays and app support

Specs compared

Spec	Foursun 12V 300Ah LiFePO4 Battery	Renogy Core 12V 200Ah LiFePO4 Battery
High Capacity	300 Ah for maximum autonomy.	—
Long Lifespan	Specified for over 4500 cycles.	—
Integrated BMS	Provides protective features, including low-tem…	—
Robust Casing	ABS housing with an IP67 protection rating.	—
Rated Capacity	—	200Ah (0.5C, 25℃)
Voltage	—	12V
Energy	—	2560Wh
Cycle Life	—	5000 Cycles (80% DOD, 80% EOL)
Voltage Range	—	10V to 14.8V
Charge Voltage	—	14.4V
Max Continuous Charge Current	—	200A
Max Continuous Discharge Current	—	200A

Show all 15 specs

Spec	Foursun 12V 300Ah LiFePO4 Battery	Renogy Core 12V 200Ah LiFePO4 Battery
Peak Discharge Current	—	400A@10s
Weight	—	44.53 lbs. / 20.2 kg
Protection Rating	—	IP65

Foursun 12V 300Ah LiFePO4 Battery vs Renogy Core 12V 200Ah LiFePO4 Battery

Prices

Foursun 12V 300Ah LiFePO4 Battery vs Renogy Core 12V 200Ah LiFePO4 Battery

Prices