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Old December 17th, 2011, 02:36 PM   #1
fukkinrizzo
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Default 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
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Old December 17th, 2011, 02:36 PM   #2
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link to regulator
7 Amp Solar Charge Regulator

link to 1.5 watt charger
1.5 Watt Solar Battery Charger

link to 5 watt charger
5 Watt Solar Battery Charger
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Old December 17th, 2011, 02:36 PM   #3
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how is this charger multi votage?

MILITARY M37 M38 M38A1 M715 M35 M211 M135 NOS 12 - 24 VOLT SOLARGIZER IS-24-L | eBay

is there a switch?
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Old December 22nd, 2011, 01:13 PM   #4
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Here's how you convert watts to amps.

There is an equation. P=I * V.

Power(P) = Current(I) multiplied by Voltage(V). So move the equation around and you get.

I = P/V (current = Power divided by Voltage)

So, your 12volt 1.5 Watt charger produces 0.125 amps and the 5 Watt charger gives you 0.417 amps.
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