Crankshaft

I order though Nuvision.  Orders usually gets here under a week.
Big time and shipping savings.

The cells are clamped in 2 rows of 8 cells.
I guess it will just be easier to do 8 at a time.  The total time should be about the same.
My 3.6 volt PSU is only 5 amps, so it's going to take a while.

I'd put some large dollops of adhesive under those cement block.
They may be heavy, but the wind can be stronger.

Bear in mind that you will require more time to charge the larger capacity battery.

I'm sticking with LF to power my valve audio.
 
Case in point:  I am about to replace a 30 year old 12volt  stepdown transformer for halogen down-lights.
It had been powering a a load of almost double it't rating for this period.
Don't reckon one of those BIC lighter sized SMPS would do the same.

A second inverter / charger?
Most folks would not recommend combining different batteries.

Even without those spikes, you are working that inverter HARD.

We updated the firmware to the latest version which appears to have solved the problem.

We updated the firmware to the latest version which appears to have solved the problem.

I don't have a temperature sensor connected.
The dealer has agreed to test the unit for me, and swap it for a new one if required.