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That’s pricey per kWh - lithium tech generally is. I’ve just installed an off-grid solar system, and ended up putting together a spreadsheet of a whole bunch of

That’s pricey per kWh - lithium tech generally is. I’ve just installed an off-grid solar system, and ended up putting together a spreadsheet of a whole bunch of battery options, got prices per kWh, and then built in a factor for lifetime/max cycles. Ignoring max cycles, the cheapest lead acid I found was £87/kWh. Lifetime was poor, however. The best bang for buck was OPzS lead acid cells - £115 per kWh, and a long, long lifetime and high cycle count. They’re the most commonly used cell in new grid-scale solar installs, and it turns out there’s a reason for that - over 15 years, they cost less than 20% of lithium over the same period.

driverdan 7y ago
That's true but those lead acid cells are only practical for stationary installations. They are far too heavy to use in vehicles.
jammmety 7y ago
Would you be able to share your research?
- madaxe_again 7y ago
  Sure. It’s scratty as sin as it was purely intended for my consumption - you can safely ignore the sheets other than batteries - panels are a pretty simple equation - more power is better, and usually cheaper per surface area, and the other gumph was specific to my requirements. You’ll note the total absence of lithium cells - I took them out as they skewed the scale so badly that it was hard to differentiate between the others. Also, all the prices are EUR, and I should have said €, not £, in my previous comment. Living between U.K./EU and being paid in USD sees me forgetting what currency I did something in quite frequently. https://docs.google.com/spreadsheets/d/1w8vPBHkMyY5jvkxtK1QhUEg1VAhMDzOWHjJDCCN22Pg https://docs.google.com/spreadsheets/d/1w8vPBHkMyY5jvkxtK1Qh...
evandev 7y ago
Where are you finding these OPzS cells?
- madaxe_again 7y ago
  In Europe - I bought 24 BAE Secura 6 (900Ah at C100) cells from an outfit called merkasol - they’re pretty commoditised and the prices are similar from different distributors. Went for those as they were the biggest OPzS cells I could safely carry by myself, at 60kg, and 42kwh of storage is plenty.

driverdan 7y ago

That's true but those lead acid cells are only practical for stationary installations. They are far too heavy to use in vehicles.

jammmety 7y ago

Would you be able to share your research?

madaxe_again 7y ago
Sure. It’s scratty as sin as it was purely intended for my consumption - you can safely ignore the sheets other than batteries - panels are a pretty simple equation - more power is better, and usually cheaper per surface area, and the other gumph was specific to my requirements. You’ll note the total absence of lithium cells - I took them out as they skewed the scale so badly that it was hard to differentiate between the others. Also, all the prices are EUR, and I should have said €, not £, in my previous comment. Living between U.K./EU and being paid in USD sees me forgetting what currency I did something in quite frequently. https://docs.google.com/spreadsheets/d/1w8vPBHkMyY5jvkxtK1QhUEg1VAhMDzOWHjJDCCN22Pg https://docs.google.com/spreadsheets/d/1w8vPBHkMyY5jvkxtK1Qh...

evandev 7y ago

Where are you finding these OPzS cells?

madaxe_again 7y ago
In Europe - I bought 24 BAE Secura 6 (900Ah at C100) cells from an outfit called merkasol - they’re pretty commoditised and the prices are similar from different distributors. Went for those as they were the biggest OPzS cells I could safely carry by myself, at 60kg, and 42kwh of storage is plenty.