Every battery reviewed by a Licensed Master Electrician with 20+ years experience. No marketing fluff. Just honest, code-compliant recommendations.
How to achieve a $0 electric bill with battery arbitrage
EG4 Electronics
| Charge Temp | 32°F to 113°F |
| BMS Protocol | CAN/RS485 |
| Peak Discharge | 5.12 kW |
| Price/kWh | $254 |
Capacity
5.12 kWh
Voltage
48V
Rick's Verdict
The best entry-level server rack battery. UL1973 listed. Great for DIY installations. Stack up to 16 units.
$1,299
$254/kWh
EG4 Electronics
| Charge Temp | 32°F to 113°F |
| BMS Protocol | CAN/RS485 |
| Peak Discharge | 10.24 kW |
| Price/kWh | $244 |
Capacity
10.24 kWh
Voltage
48V
Rick's Verdict
Double the capacity of the LifePower4 in the same rack space. Best value per kWh for serious installations.
$2,499
$244/kWh
Tesla
| Charge Temp | -4°F to 122°F |
| BMS Protocol | Proprietary |
| Peak Discharge | 11.5 kW |
| Price/kWh | $681 |
Capacity
13.5 kWh
Voltage
High Voltage
Rick's Verdict
Premium all-in-one solution with integrated inverter. Requires Tesla Certified Installer - NOT a DIY product. Best for homeowners who want turnkey installation.
$9,200
$681/kWh
Discover Energy
| Charge Temp | -13°F to 131°F |
| BMS Protocol | CAN |
| Peak Discharge | 10 kW |
| Price/kWh | $243 |
Capacity
16.08 kWh
Voltage
48V
Rick's Verdict
Outdoor-rated powerhouse with IP65 enclosure and self-heating to -13°F. 10kW continuous output handles whole-home backup. Best for cold climates and outdoor installations.
$3,915
$243/kWh
Bluetti
| Charge Temp | 32°F to 113°F |
| BMS Protocol | Proprietary |
| Peak Discharge | 7.6 kW |
| Price/kWh | $707 |
Capacity
9.9 kWh
Voltage
48V
Rick's Verdict
Plug-and-play home battery system. No electrician required for basic setup. Good for renters or those wanting easy installation. Limited to 7.6kW output.
$6,999
$707/kWh
Sigenergy
| Charge Temp | 14°F to 131°F |
| BMS Protocol | CAN |
| Peak Discharge | 10 kW |
| Price/kWh | $331 |
Capacity
16 kWh
Voltage
High Voltage
Rick's Verdict
Premium all-in-one system with integrated inverter. High voltage (500VDC) requires professional installation. Rick gives high marks for cost and ease of install. Outdoor rated.
$5,300
$331/kWh
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