Edison Batteries

[Mike90250]

and for every 50 watts you take out, it needs 90watts replaced.

But they do work, you have to change the electrolyte every 10 years too.

[Sunking]

They are completely unsuitable for RE applications. So much so Edison never renewed his patent on them, and US manufactures quit making then 1975. Now only a few companies make them mainly in China.

• They cannot be charged or discharged at high rates required for RE application.
• Extremely low energy density, meaning they weigh a lot for very little energy, much heavier than lead acid.
• Very high self discharge rates of 40% per month.
• Very steep voltage drop off State of Charge voltages.
• Extremely high levels of hydrogen gassing when charge requiring special ventilation.
• And the list goes on.

[cornwallis]

Does anyone have any comment on these so-called "Edison" batteries that supposedly last forever (or at least for QUITE a long time)?

I've read some articles about them lasting for decades and not being susceptible to sulfation, etc.