Last Updated on June 20, 2025
This spring, a new solid-state marine battery caught the attention of the Host. He acquired a 48V 60Ah pack from Solid State Marine and ran a side-by-side test against a 48V 32Ah LiFePo4 battery. He examined weight, real-world run time, and ease of use on his small boat.
Key Takeaways
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The 60Ah solid-state battery weighs just 35 lb.
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A 32Ah LiFePo4 pack weighs 33.6 lb.
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Solid-state battery ran ~2 hours at a 1,000W load.
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LiFePo4 pack lasted about 1 hour 15 minutes.
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New product lacks user manual and Bluetooth app support.
Solid State Vs LiFePo4
Solid-state cells are smaller and much lighter than lithium iron phosphate blocks. In the test:
|
Battery Type |
Amp Hours |
Weight |
|---|---|---|
|
Solid State Marine (48V) |
60 Ah |
35 lb |
|
PowerHouse LiFePo4 (48V) |
32 Ah |
33.6 lb |
At first glance, one gets almost double the amp hours for roughly the same weight.
How It Was Tested
The Host did not want to run his boat motor all the way down the river in cold, windy weather. His buddy Dan and he used a 1,000W space heater to match the load of an ePropulsion Spirit 1.0 Plus outboard. They hooked each battery to an inverter and timed how long they kept that heater going at top draw.
What Was Found
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Solid-state battery lasted just under 2 hours before voltage dropped below useful levels.
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LiFePo4 pack ran about 1 hour and 15 minutes before its bars fell fast near the end.
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Both packs got a bit warm, but nothing alarming.
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The solid-state pack held its voltage more steadily until near cutoff.
The voltage on the solid-state pack started around 48V and slowly fell to 44.8V after two hours. Then it dropped quickly to about 41V before it was shut down. The LiFePo4 pack showed similar behavior but at a lower starting amp hour, it ran out sooner.
Pros And Cons Of The Solid State Battery
Pros:
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Packs more capacity into lighter gear.
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Steady voltage under heavy load.
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Promising new tech for electric boats.
Cons:
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No printed manual or setup guide included.
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Bluetooth monitoring not working yet.
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Higher cost per amp hour than LiFePo4.
Final Thoughts
This solid-state marine battery is a big step for boat electrification. It delivers on weight savings and run time, even if the company’s still ironing out user support and monitoring tools. If one needs lighter, longer-lasting batteries for an electric outboard, this one’s worth a look—pricey, but it may pay off in performance.
