User Tools

Site Tools


electrical:solar:synopsis_puzzle2

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
electrical:solar:synopsis_puzzle2 [2017/07/31 14:06]
frater_secessus [Synopsis: HandyBob's RV Battery Charging Puzzle 2]
electrical:solar:synopsis_puzzle2 [2018/02/10 11:11] (current)
frater_secessus [Synopsis: HandyBob's RV Battery Charging Puzzle]
Line 1: Line 1:
 +This page aims to distill the knowledge contained in HandyBob'​s [[https://​handybobsolar.wordpress.com/​the-rv-battery-charging-puzzle-2/​|RV battery charging puzzle 2]] page. 
  
 +Particularly useful and pithy statements are quoted directly under fair use.
  
-This page aims to distill the knowledge contained in HandyBob'​s [[https://​handybobsolar.wordpress.com/​the-rv-battery-charging-puzzle-2/​|RV battery charging puzzle 2]] page. 
- 
-Particularly useful and pithy statements are quoted directly. 
  
 ====== Synopsis: HandyBob'​s RV Battery Charging Puzzle ====== ====== Synopsis: HandyBob'​s RV Battery Charging Puzzle ======
  
 +[Note from Secessus: ​ I do my best here to faithfuly summarize //​Bob'​s//​ point of view and not editorialize or take issue with it.] 
  
 HandyBob and his wife are fulltimers in a 5th wheel and have no generator. ​ He prefers quiet and and wants folks to stop using generators, or at least use them more considerately. HandyBob and his wife are fulltimers in a 5th wheel and have no generator. ​ He prefers quiet and and wants folks to stop using generators, or at least use them more considerately.
Line 65: Line 64:
 ===== converters ===== ===== converters =====
  
-Most OEM [[electrical:​converter|converters]] are bad, functioning like trickle chargers. ​ Even the smart ones charge at too low a voltage and commence float too early. ​ They may get confused by [[electrical:​12v:multipoint_charging|multipoint charging]].+Most OEM [[electrical:​converter|converters]] are bad, functioning like trickle chargers. ​ Even the smart ones charge at too low a voltage and commence float too early. ​ They may get confused by multipoint charging. 
 + 
 +===== generators ===== 
 + 
 +A generator with DC battery charging output is better than running the converter or auto charger on 110v. 
 + 
 + 
 +===== solar ===== 
 + 
 +Bob runs his RV off 345W of panel and 450AH of 6v deep cycle batteries. 
 + 
 +> "​Adding solar panels to an under wired system is like putting a big motor in a little car with a tiny drive train & skinny tires. ​ You can’t use the power." ​ -- HandyBob 
 + 
 +When seeking advice: 
 +> "​Don’t ask the guy with solar panels and a generator running behind his rig on a sunny day." ​ -- HandyBob 
 + 
 + 
 +"​Professional"​ installers may not be any good.  
 + 
 + 
 +===== charge controllers ===== 
 + 
 +Get an oversized ​[[electrical:​solar:charge_controller|3-stage charge controller]] with an equalization function. 
 + 
 +Bob prefers Morningstar. 
 + 
 +===== MPPT boost controllers ===== 
 + 
 +They work but the gains are found in specific scenarios like deeply discharged batteries. ​ The gains are more likely to be 5%-10% over PWM. 
 + 
 + 
 +===== wiring ===== 
 + 
 +"Big wire" is cheaper than panels for a similar gain in power. 
 + 
 +Wiring from panels to controller is important; ​ wiring from the controller to batteries is critical. 
 + 
 +Use stranded wire, the type (building, automotive, welding) is less important. ​ Use UV-shielded wire for external runs. 
 + 
 +> "big wire is there to limit voltage drop, not to carry amps." -- HandyBob 
 + 
 + 
 +===== inverters ===== 
 + 
 +Use a properly sized [[electrical:​inverter|inverter]] for the job;  this may mean owning more than one inverter. 
 + 
 +MSW is fine unless you know you have something that needs PSW:  "​residential refrigerators,​ washing machines, some air purifiers, some desk top computers and Craftsman brand battery chargers."​ 
 + 
 +"Soft start" inverters work work well. 
 + 
 +Many inverters have a high voltage disconnect (Vhvd) of 15v.  Temperature compensated charge controllers can hit 15v easily. 
 + 
 +===== installation considerations ===== 
 + 
 +Install the charge controller near the batteries. 
 + 
 +Locate solar panels so they are not shaded. 
 + 
 +===== fusing ===== 
 + 
 +Bob prefers fuses to automotive-style circuit breakers.
  
 +Avoid fuse holders with springs in them.
  
 +Fuse every positive wire within a few inches of the battery.
  
  
electrical/solar/synopsis_puzzle2.1501535199.txt.gz · Last modified: 2017/07/31 14:06 by frater_secessus