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> solar pannel, charging battery

twilliams
post Sep 21 2016, 05:34 PM
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Favorite Truck Camper(s): northstar larado sc
Type and Brand of Truck(s) Owned: 1997 dodge ram 1500 sport 4x4short bed
Type of Tiedowns used: torklift
Truck and Camper Setup: 1997 dodge ram 1500 sport 5.9 short bed 4x4. rear airbags. have a 2001 northstar 8 ft larado. with torklift tiedowns



I have a hard side camper with one battery. I would like to know how many solar panels will it take to trickle charge the battery and how many watts.
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towpro
post Sep 28 2016, 03:29 PM
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Favorite Truck Camper(s): Arctic Fox
Type and Brand of Truck(s) Owned: 15 Ram 3500 Dually 4x4
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Truck and Camper Setup: 2016 Arctic Fox 990



QUOTE(twilliams @ Sep 21 2016, 05:34 PM)
I have a hard side camper with one battery. I would like to know how many solar panels will it take to trickle charge the battery and how many watts.
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Just sitting there my camper uses 1.5 - 2 amps I think.

P (power in watts) = I (current) X E (voltage).
batteries charge at higher than 12v, so I always use 13v in my math.

13V x 2A = 26Watts. But that is if everything is 100% efficiency and the sun is always shining. you have to figure in night time, cloudy days, etc. Plus you need to be able to charge batteries also.

so in theory, 100W divided by 13V = 7.6A.

But 100w solar panel through a PWM (cheaper) controller will really charge around 5-6 amp in full sun conditions. that will charge a battery slowly.

I run two 27 series AGM batteries, and have two 100w panels. I have seen upwards to 12A charging when batteries are around 75% charged.

I run Renogy panels found at amazon, but I have a Bogart Engineering meter and solar charger.
I am looking at a new camper, and solar goes with old camper, so I might do some things different, but I am happy with all the parts I have, but might spend my money different next time.
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twilliams
post Sep 29 2016, 02:37 PM
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Group: Members
Posts: 34
Joined: 25-June 16
Member No.: 9,025
Favorite Truck Camper(s): northstar larado sc
Type and Brand of Truck(s) Owned: 1997 dodge ram 1500 sport 4x4short bed
Type of Tiedowns used: torklift
Truck and Camper Setup: 1997 dodge ram 1500 sport 5.9 short bed 4x4. rear airbags. have a 2001 northstar 8 ft larado. with torklift tiedowns



thanks for the info. I will try the math. amazon is a good site
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