check out the new remote control Jockey Wheel SmartBar rearview170 Beam Communications SatPhone Shop Topargee products Enginesaver Low Water Alarms
Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: Solar controllers


Veteran Member

Status: Offline
Posts: 64
Date:
Solar controllers


Hi everyone. What amp controler would I need for 500 watts of solar? ie 2 x 250watt mono panels.

Thanks.

i looked on here but couldnt find the answer.

 



__________________

Lozza1956

 

PAY IT FORWARD, and SMILE



Senior Member

Status: Offline
Posts: 246
Date:

40 amp to be on safe side

__________________
the seconds keep on ticking away


Guru

Status: Offline
Posts: 1315
Date:

To be safe divide the solar watts by the battery voltage, 41.6 amps for a 12v system and 20.5 amps for a 24v system. This gives a 30% safety margin which is important because certain conditions can make a solar panel put out 100% or more of its rated capacity. Cloud edge effect near water/snow or sand where reflective glare is noticeable a panel can product 125% of its rated output. Most quality controller can handle that and/or have current limiting, cheap ones do not and the smoke will come out either rendering it dead with no current flow or punched through with no control at all. Many threads on these forums about batteries killed by a punched through solar controller so saying that never happens isn't the type of information that is helpful

T1 Terry

__________________

You can lead a head to knowledge but you can't make it think. One day I'll know it all, but till then, I'll keep learning.

Any links to any sites or products is not an endorsement by me or do I gain any financial reward for such links 



Veteran Member

Status: Offline
Posts: 64
Date:

Thanks guy. I was tipping with 40 - 50.

cheers.



__________________

Lozza1956

 

PAY IT FORWARD, and SMILE



Senior Member

Status: Offline
Posts: 353
Date:

HI
solar only
Epsolar
Morningstar

dc/dc chargers and solar
Projector IDC 50amp
Redarc 40amp
Enerdrive 40amp

Need to make sure which ever controller u pick can handle the input wattage and voltage . Some controllers have specific requirements .

Most likely 500watts in a 12 v system = 27.5 amps ++ up to 30% for mppt = 8 amps bonus =total 35.5 amps . ideally a 40amp controller.

__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us
Purchase Grey Nomad bumper stickers Read our daily column, the Nomad News The Grey Nomad's Guidebook