What the hell is a kWh anyway? Well, it is an amount of energy equal to 1,000 watts for one hour. Look at it another way. 10 kWh is 10,000 watts for 1 hour or the amount of energy required to drive a 10 kW electric outboard motor for 1 hour at full power.
I need battery of 10 kWh for each of the two electric outboard motors as an absolute minimum. It means that I could run them at half power for 2 hours.
So what is so important about $100 per kWh? For starters, we are talking $US and this is what the price that batteries must get down to before electric cars cost the same as piston cars. Some say we are already there but the exact year isn’t all that important. Whenever it comes, price equity marks the end for piston cars. Have a look at this graph:
The red line above is the $100 per kWh mark. According to BloombergNEF battery price should get down to $100 per kWh by 2024. At that price, I will finally be able to afford to completely electrify Borderline and remove those dreadful piston engines.*
At the tender age of 79 I will still have at least anther 20 years to enjoy solar electric boating. Perhaps I will sell the motorcycle and settle down to a more gentle, floating pace of travel.