"Wally" wrote:

> Lew - I seem to recall that Hunter isolates the starter battery, using 
> a small solar panel to charge it as you suggest, but something I'm not 
> understanding here. The starter battery is isolated, but a 10W charger 
> will take quite a while to recharge the battery after starting, since 
> that's a large draw, it sounds inefficient if not ineffective - or 
> does the battery still have the alternator charging it?

Starting an engine requires a relatively small amount of energy from the 
starting battery; however, it requires it at a very high rate.

If you ever had to try to start a stubborn engine in the winter time 
anyplace in the northern US, you no doubt have had to try to start the 
engine for maybe 2 minutes at a time for maybe 2-3 attempts before 
draining the battery.

The point is, starting an engine requires a small amount of power that 
can be replaced by a small solar panel over a relatively long time.

A word of caution:

In this application, smaller is better.

If the solar panel is too large, you either end up boiling the battery 
or adding complexity by adding a means to dump the excess energy 
generated after the battery has been recharged.

Lew


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