12v harbor freight solar battery charger
I have a couple 12v 1.5 watt solar battery chargers from Harbor Freight. I noticed that these do not have a regulator on them and you have to buy that part separately. The Regulator is $29 and I saw the charger is on sale for $12.
My questions are:
-How do I know if I need the regulator?
-This charger says 1.5 watt and another one they have is a 5 watt charger. I am used to measuring charge in amps. How does this translate?
-I want to use this to maintain the large (about the size of 2 or more 6TL's) battery on my excavator, the stock battery on my S-15 blazer and the stock sized pickup battery on my mud truck. What do I need to know to make sure I am doing it right?
-would I be better off buying a different solar charger for the excavator and using the 2 HF chargers on the smaller batters?
Feel free to include any other information that would educate me on the subject at hand.
thanks in advance