This started as a Stanley battery adaptor from a download from Stanley Battery adapter (FMC688L FMC687L) by kicune - Thingiverse. Many thanks to kicune. Then it started to grow arms and legs.
Initially added a Winners DC-DC board to drop the 18V down to 12V. Then I added a couple of car cigarette lighter sockets and a switch. I then read it was not good practice to allow the battery voltage to fall below 15V so I added a LV cutout (the middle board), Then I thought it would be nice to check the battery capacity so I added the power meter. This is still a prototype and a work in progress, but it seems to work ok. Next step is to make the case more solid and secure.
Also many thanks to Arnas who I believe had some tutorials on using Totemmaker with Sketchup. (Can’t find them any more, have they been deleted?). Previously I was just building and dismantling if it didn’t fit. It’s good to assemble in sketchup to see if it works. Manipulating the beams and 3D parts has gone well but I’m struggling a bit with positioning the C-brackets etc. Anyway it keeps my 70 year old brain active in retirement.