Or: How to charge vehicle batteries from the sun, yippie!
The story was: At one point, unexpectedly (I must have forgotten to cut off the truck batteries while parking up), the truck batteries were FLAT!
After I got past my shock(!), I figured out HELP though, as follows:
- the two solar-powered leisure batteries are always full
- but the two truck batteries were flat
- I still have a small Optimate (from motorbiking), and a new small volt/amp converter from China
- The small Optimate, I calculated, would take 10 days to charge both big truck batteries (mine puts through only 0.8A)
- I didn't want to wait that long
- So then I charged one truck battery with the Optimate 4 (thus in an optimal fashion, but only at 0.8A)
- ...while charging the other truck battery with the Chinese volt/amp converter (fast charging: set to 14.2V and as much Amps as the battery would draw)
- For safety, every so often I swapped the chargers around so that the Optimate 4 keeps both batteries safe during my improvised charging exercise.
It worked like a charm, somewhat to my surprise: Within a weekend I had both big truck batteries desulfated, charged, and fully optimized. This way, I didn't have to wait 10 days (having only the smallest Optimate). And off we could go, with the truck house!
For anyone mega interested(??), the Chinese volt/amp converter that I used is this, and I am happy to link to it as IT IS super quality indeed, yes.
So now I know a way to always be able to start the truck even when its batteries are flat! Mind you, I am not an electro-technician, so this solution didn't occur to me while dog walking.
Also, before connecting anything (I 'm always scared sth might blow up) and before setting the charging parameters, I intensely consulted the internet community, aka "at how many volts should leisure batteries charge?", "how many amps can I safely push through this cable at this distance?", etc etc.