tarnold
georgia
Senior Member
Joined: 03/01/2010
View Profile
 Offline
|
Just got a 100w panel and want to run a 12v 80w radiator fan, NO BATTERY. The panel is cranking out 23v do I need to put a controller in the middle. All controllers I look at have a battery hookup between the panel and output.
|
2oldman
NM
Senior Member
Joined: 04/15/2001
View Profile
Offline
|
I give up, why no battery? The 23v was measured how.. with nothing hooked up? 80w is too much for that panel, even in the best of conditions.
Normally panels aren't used to "run" things. They're for charging batteries, which run things.
|
tarnold
georgia
Senior Member
Joined: 03/01/2010
View Profile
Offline
|
Greenhouse, only want fan to run when enough sun to run the fan. Fan says 5-8 amps, not enough in a 100W renogy panel to run that? 23v with a vmeter with nothing connected off back of panel.
|
Boon Docker
Mountain Foothills of Southern Alberta
Senior Member
Joined: 10/30/2015
View Profile
|
A controller will not work without a battery connected. That panel will not put out the amps needed for the fan.
|
red31
Dallas
Senior Member
Joined: 08/04/2008
View Profile
Offline
|
the fan will not operate at full speed but should at least spin!
20W Solar Panel / 21W Bulb - A Perfect Match? (part 1)
https://www.youtube.com/watch?v=JZQEJ33xblE
|
|
|
BFL13
Victoria, BC
Senior Member
Joined: 02/15/2006
View Profile
|
Will the fan be damaged by a higher voltage? If not then panel direct might power it. Panel will do 5 to 6 amps aimed at high sun mid-day mostly under 5 rest of day
Some controllers work no battery Some say they are for running lighting
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.
|
way2roll
Wilmington NC
Senior Member
Joined: 10/05/2018
View Profile
Offline
|
I had a solar attic fan in a previous house. Pretty large fan and pretty small panel. No battery. Accomplished exactly what you want. Ran when the sun was out, passive when no sun. Even had a thermal switch you could loop in. It was rated for like 1500 CFM. Don't see why the same method would not work with your setup.
2023 FR Sunseeker 2400B MBS
|
wa8yxm
Davison Michigan (East of Flint)
Senior Member
Joined: 07/04/2006
View Profile
Offline
|
Yes you need a controller .. an MMPT type (Not a PWM) and I'd recommend a battery as well.. NOTE.. 100 watt panel will not give you a full 100 watts most of the time.. closer to 50 Assuming the fan runs when needed not full time with the aid of a battery this should work
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times
|
CA Traveler
The Western States
Senior Member
Joined: 01/03/2004
View Profile
Offline
|
23V is open circuit voltage, ie no load. About 18V with a load no controller or battery, fan may/may not be OK.
But without controller and battery their will be a lot of power variation to the fan and it could be damaged as a result.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob
|
Lwiddis
Southern California :(
Senior Member
Joined: 08/12/2016
View Profile
Good Sam RV Club Member
Offline
|
Solar panels charge batteries through a controller. Batteries supply power to 12 volt fans, for instance. Or an inverter for 120 volt fans. Don’t try to reinvent the…wheel.
Winnebago 2101DS TT & 2022 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad
|
|
|
