One shot timer

[ajh]

As the days draw in with less sunlight I want to charge an ac coupled battery from solar PV panels without discharging my main battery. I can easily do this manually when at home and don't want to invest in a solar electricity diverter, far too expensive.

I have a voltage controlled switch but as the load will itself depress battery voltage I can set a hysteresis to switch off at a lower voltage, this may induce short cycling/oscillation.

OR I am thinking I may be better using the relay output to trigger a one shot timer for 10 minutes and if the voltage remains above the trigger point after the initial trigger to charge the battery for another ten minutes USW. Ten minutes would consume about 200Wh which I don't mind the main battery supplying should the sun get blocked..

I do possess an old Crouzet MUR1 which should do the job but the manual I found online defeats me where I had no such problems 20n years ago.

[Brian Gaff]

For many years I used a two transistor home made Schmidt trigger and an orp12 photocell. Yes thre was a bit of hysterisis, but if I removed it any vehicle in the road with a strobing light on top swithed it on and off all the time, wearing out the relay. Brian

[ajh]

I used to be able to solder simple things but lack of stereo vision makes getting the wire, solder and iron in the same place a challenge.

A simple circuit runn> For many years I used a two transistor home made Schmidt trigger and an