fuer meinen Highline, der ja noch in Restauration ist, damit die Batterie (neu) nicht wieder leer wird.
Panel produces 18.8 volts 3.2 watts @170 m amps.
Hat mir hier noch mal einer durchgerechnet:
Here's an example:
An 12 V 80 Ah battery has a power rate= 960 Wh.
Self Discharge of a new battery/month = 2 to 3% (it's higher for older batteries due to internal resistance and such)
Power rate loss in a month = 28.8 Wh @ 3%
Per day, power rate loss is roughly = 1 Wh
The solar charger will operate 5 to 8 hours/day depending shading conditions...
Time needed to overcome self discharge = 1 Wh/1.5 W = 0.67 hr
So if you use your 1.5 W solar charger for more than 0.67 hr/day you should be fine to beat self discharge, and charge your battery.
All this is based on a new battery of 80 Ah and 3% self discharge/month. Can't recall what the battery rating is for the e34. Also, the 1.5 W peak power from the charger is for sunlight hitting the cell at normal incidence. Any off-angle sunlight and placing the charger behind glass will make the charger operate less efficiently.
If you want to make sure you're generating decent charge, then hook up 2 of these chargers in parallel.
