Solar Panel for battery charging

[spasm3]

I'm thinking of getting 2 of these, one for the RV with a group 31 battery, and for the battery in my toro ss5000, its a small battery.

http://www.northerntool.com/shop/tools/product_200576945_200576945

I'm thinking it puts out probably about a .5 amps. So is this too small for the Rv battery , and is it going to over charge the small mower battery? The mower battery tag says its 15 ah the cold start is 195cc at 0 f.

This is for winter storage of both batteries, the panel is stated to have a blocking diode to prevent reverse drain at night.

The price seems good.
Thanks for your thoughts.

 

[bullwinkle]

I have two of the ones that come in this kit-
http://www.northerntool.com/shop/tools/product_200623684_200623684
There's one on the GMC 6.2 pickup, & my F-450 work truck in my sig. Both trucks have 2 batteries each, and the solar chargers keep the batteries topped off & haven't hurt anything in the 3 years I've been using them. Not sure about the bigger one you have listed, you might need a charge controller for that one.

 

[Greasymechtech]

It will keep both batteries topped off. Don't expect the 7 watt panel to recharge a dead battery unless you don't mind waiting a month.

I always recommend a solar charge controller.

Typical charge controllers that can be found on ebay:

http://www.batterytender.com/Accessories/Battery-Tender-Solar-Controller.html
http://www.batteryminders.com/12-volt-solar-battery-charger-SCC-180
http://www.eco-worthy.com/catalog/worthy-solar-charge-controller-12v24v-p-459.html
http://www.harborfreight.com/7-amp-solar-charge-regulator-96728.html

 

[spasm3]

Would this controller work?

http://www.northerntool.com/shop/tools/product_200578587_200578587

How much power do most charge controllers consume?

 

[spasm3]

Originally Posted By: Greasymechtech
It will keep both batteries topped off. Don't expect the 7 watt panel to recharge a dead battery unless you don't mind waiting a month.

I always recommend a solar charge controller.

Typical charge controllers that can be found on ebay:

http://www.batterytender.com/Accessories/Battery-Tender-Solar-Controller.html
http://www.batteryminders.com/12-volt-solar-battery-charger-SCC-180
http://www.eco-worthy.com/catalog/worthy-solar-charge-controller-12v24v-p-459.html
http://www.harborfreight.com/7-amp-solar-charge-regulator-96728.html




The eco-worthy says it consumes .2mw so that takes the output of the 7watt panel from .583 to .383 amps. is that too much loss to make it worth it?