Solar charger and AC charger together

DuaneJDuaneJ Posts: 1Registered Users
I have a new camper trailer.  I have a new AGM battery and an inline AC charger.  I want to add a solar panel with controller. 
How do I wire the to chargers so they do not interfere with each other? 
Do I put a switch in line for each of them so I turn one on and the other off?
Can I put a switch in line on the solar system without hurting it?  I have read that the controller and panel and battery must always be connected.


  • kamchukakamchuka Posts: 55Registered Users ✭✭
    i would think a charge controller does that on its own. both chargers should be equipped with diodes to not allow current to go backwards. I am not a pro though. you can stack things onto a battery terminal IE: solar, wind, genset etc. should be plug and play. make sure you hook the charge controller to the battery first then input the panels.  
    900 watts pv (building on) on poles, off grid 60a mppt, magnum 2k 12v msw, 1400 ah forklift battery (rewired to 12v), 8k diesel gen for house. honda eu6500, 2x 8D, coleman 800w inv for shop, honda 5k for well (pumps to 1000g cistern), ryobi 2k suitcase for mobile ops. 
  • mcgivormcgivor Posts: 2,164Solar Expert ✭✭✭✭✭
    An AC charger and charge controller can be connected in parallel without issues, as each will see the voltage at the battery and contribute as required. NOTE. Be sure the AC charger is a smart or regulate type, some cheaper units can raise the voltage to higher than desired, when using AGM batteries make sure the charger supports them as a charger designed for flooded batteries can damage AGM by overcharging, causing venting of the gasses, which once lost, can never be replaced, resulting in lost capacity. The best option would be a multi stage charger designed for the purpose, such as this 
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 

  • EstragonEstragon Posts: 2,773Registered Users ✭✭✭✭
    As well as @mcgivor's comments, which are apt, on the issue of "switching" the solar system, I'd +1 @kamchuka comment. The controller should boot from battery first, then see pv.
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • bsolarbsolar Posts: 103Solar Expert ✭✭✭
    i would switch them .. imo the correct way to do it would be to switch the positive panel lead AND the positive charger lead to the batt .. then the correct procedure would be to always switch off the panel before connecting or disconnecting the solar charger ..
  • mike95490mike95490 Posts: 7,874Solar Expert ✭✭✭✭
    Quality solar chargers will work transparently with quality mains power and Quality vehicle alternator Isolator chargers
    I currently have Midnight, Morningstar and Xantrex all charging my battery bank, as required
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

Sign In or Register to comment.