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Ohmmu Sodium Group 31 100Ah Battery vs JM Batteries 51.2V 100Ah Sodium-Ion Battery

These are not substitutes. The Ohmmu is a 12V Group 31 starter and deep-cycle battery for vehicles, boats and off-grid 12V systems. The JMBatteries unit is a 51.2V rack-style storage battery for home solar and inverter banks. Buy the Ohmmu for anything that cranks an engine or runs on 12V. Buy the JMBatteries pack only if you are building a 48V solar storage bank. On build, the Ohmmu publishes a 6,000-cycle rating, IP65 sealing and a wide temperature window; the JMBatteries listing leans on a 10-year warranty and a 150A BMS discharge limit but gives little cycle data.

  • Choose the Ohmmu Group 31 if you need a drop-in 12V battery that starts engines, survives full drains and works in extreme cold or heat.
  • Choose the JMBatteries 51.2V pack if you are assembling a 48V home solar or inverter storage bank and need a rack-mount battery with a BMS and RS485.

Prices

  • Ohmmu Sodium Group 31 100Ah Battery: $599.00 at Overlander's Outpost (last seen Nov 8)
  • JM Batteries 51.2V 100Ah Sodium-Ion Battery: $1,410.00 at JMBatteries (last seen Nov 8)
  • Difference: the Ohmmu Sodium Group 31 100Ah Battery is $811.00 cheaper than the JM Batteries 51.2V 100Ah Sodium-Ion Battery at the latest prices (Nov 8)
G
Group 31 - 100Ah Sodium 12V Dual Purpose Deep Cycle Battery

Ohmmu Sodium Group 31 100Ah Battery

Group 31 - 100Ah Sodium 12V Dual Purpose Deep Cycle Battery

$599.00at Overlander's OutpostChecked Nov 8
See all prices and details
Visit Overlander's Outpost
Pros
  • Starts engines and deep-cycles from one battery
  • Handles being drained to 0V without damage
  • Wide -40°F to 172°F operating range
  • IP65 sealed for wet and saltwater use
  • Series and parallel expansion with no unit cap
Cons
  • Only 12V, so a 48V bank needs four in series
  • Lower total energy than a 48V pack
  • Sodium-ion is newer, so long-term field data is thin
S
Solar Power 51.2V 100ah Sodium Ion Battery

JM Batteries 51.2V 100Ah Sodium-Ion Battery

Solar Power 51.2V 100ah Sodium Ion Battery

$1,410.00at JMBatteriesChecked Nov 8
See all prices and details
Visit JMBatteries
Pros
  • 4.8kWh in one unit, far more stored energy
  • Built for 48V solar and inverter systems
  • BMS with 150A discharge and 100A charge limits
  • 10-year warranty stated
  • RS485 and LCD available
Cons
  • Cannot start an engine
  • No published cycle life or temperature range
  • RS485 and LCD are customization, not standard
  • Not a drop-in for 12V vehicles or boats

What separates them

Ohmmu Sodium Group 31 100Ah BatteryJM Batteries 51.2V 100Ah Sodium-Ion Battery
Nominal voltage12V, Group 31 drop-in51.2V, 48V-class system
RoleDual purpose: engine starting plus deep cycleEnergy storage only, no cranking
Starting power2,000+ CCANot rated for engine starts
Capacity100Ah, about 1,400Wh100Ah, about 4.8kWh
ChemistrySodium-ion, tolerant of full discharge to 0VSodium-ion with BMS-managed limits
Operating temperature-40°F to 172°FNot published in the listing
Cycle life6,000 cycles at 80% depth of dischargeNot published
Expansion and commsSeries and parallel, no unit limit, up to 72V+RS485 and LCD as customization options

Prices at every store

Ohmmu Sodium Group 31 100Ah Battery

  • Ohmmu EnergyNew

    In stockReturn policy

    $599.00Checked Nov 8
    Visit Ohmmu Energy
  • Overlander's OutpostNew

    In stockReturn policy

    $599.00Checked Nov 8
    Visit Overlander's Outpost
All 2 stores and price history →

JM Batteries 51.2V 100Ah Sodium-Ion Battery

  • JMBatteriesNew

    In stockReturn policy

    $1,410.00Checked Nov 8
    Visit JMBatteries
Prices and history →

Questions and answers

Can I use the Ohmmu in a 48V solar bank?
Yes, by wiring four in series. Ohmmu allows series and parallel expansion with no unit limit, up to 72V and beyond. The JMBatteries pack is already 51.2V in one case, which is simpler for a large bank.
Which one can start an engine?
Only the Ohmmu. It is rated at 2,000+ CCA and built as a dual purpose battery. The JMBatteries pack is storage only and has no cranking rating.
Which lasts longer?
Ohmmu publishes 6,000 cycles at 80% depth of discharge. JMBatteries does not publish a cycle count, so the Ohmmu claim is the only one you can compare against.
Is the JMBatteries pack worth stepping up to?
Only if you need 48V storage. It holds about 4.8kWh against roughly 1.4kWh for the Ohmmu, but it cannot start anything and gives no cold-weather rating.
Which handles cold better?
The Ohmmu, on paper. It is rated from -40°F to 172°F. JMBatteries does not list an operating temperature range.
Do both need a BMS?
The JMBatteries pack has a built-in BMS. The Ohmmu listing does not describe one, so check with the seller before using it in a large series bank.

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More comparisons

  • 48V 100AH Stackable Super Rechargeable Na+ Sodium Ion Battery vs Group 31 - 100Ah Sodium 12V Dual Purpose Deep Cycle Battery
  • 48V 100AH Stackable Super Rechargeable Na+ Sodium Ion Battery vs Solar Power 51.2V 100ah Sodium Ion Battery