Epoch 12V 300Ah Essential
#3 in LargeFull review
For RVs and boats that want a large, heated, Bluetooth-monitored bank in one Group 31 case. It suits cold-weather users who would otherwise wire up three 100Ah batteries.
Epoch $1,249$1,249
The Epoch 12V 300Ah Essential and the Power Queen 12V 320Ah Mini are evenly matched, rated 3.7 and 3.7. The Epoch 12V 300Ah Essential leads on warranty and cold weather. The Power Queen 12V 320Ah Mini wins on value. The Power Queen 12V 320Ah Mini costs $593.51 less ($655.49 vs $1,249).
Power Queen 12V 320Ah Mini
#4 in LargeFull review
For RV owners who want a full 4 kWh bank in a tight compartment and camp mostly above freezing.
Amazon $655.49$655.49
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Epoch 12V 300Ah Essential for warranty (11-year warranty vs 5-year warranty) and cold weather (self-heating, so it charges below freezing vs stops charging below freezing (no heater)).
- Choose the Power Queen 12V 320Ah Mini for value ($0.16 per rated Wh vs $0.33 per rated Wh).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large 12V lithium battery; a clear win is highlighted. How we rank explains each one.
| Factor weight | Epoch 12V 300Ah Essential | Power Queen 12V 320Ah Mini |
|---|---|---|
| Overall rating | 3.7/5 | 3.7/5 |
| Value 35% | 54 $0.33 per rated Wh | 86 $0.16 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Output 15% | 50 200 A continuous (about 2,560 W at 12.8 V) | 50 200 A continuous (about 2,560 W at 12.8 V) |
| Warranty 15% | 100 11-year warranty | 50 5-year warranty |
| Cycle life 10% | 50 4,000 cycles, maker rating | 50 4,000 cycles at 100% depth, maker rating |
| Cold weather 10% | 100 self-heating, so it charges below freezing | 60 stops charging below freezing (no heater) |
Specifications
| Epoch 12V 300Ah Essential | Power Queen 12V 320Ah Mini | |
|---|---|---|
| Capacity | ||
| Rated capacity | 300 Ah (3,840 Wh) | 320 Ah (4,096 Wh) |
| Nominal voltage | 12.8 V | 12.8 V |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycle life | 4,000 | 4,000 at 100% depth |
| Price per Wh | $0.33 | $0.16 |
| BMS | ||
| Continuous discharge | 200 A | 200 A |
| Peak discharge | 400 A for 3 s | 1,000 A for 1 s |
| Max charge current | 200 A | 200 A |
| Low-temperature charging | Self-heating | Charge cutoff only |
| Bluetooth monitoring | Yes | Yes |
| Series / parallel | up to 4 in series, 4 in parallel | up to 4 in series, 4 in parallel |
| Build | ||
| Case size | Group 31 | - |
| Dimensions | 13.75 x 7.63 x 10.00 in | 14.49 x 7.44 x 10.04 in |
| Weight | 58 lb | 57.2 lb |
| Terminals | M8 bolt | M8 |
| Water resistance | IP54 | IP65 |
| Warranty | 11 years | 5 years |
| Released | 2026-07 | 2026-05 |