32v and 64v charge controllers

I have been asked to solarize other things around the railroad after the success of the caboose.
One is a locomotive (32 cells lead-acid, 64v nominal, 74v actual float voltage) simply as a battery maintainer, 1-2 amps tops, not much room for panels.
The other is a coach (16 cells lead-acid, 32v nominal, 37v float) to provide car interior lights and headlight same as on the caboose.

My question is, where to get solar charge controllers for these oddball voltages? They absolutely need to do proper battery management (e.g. Not overcharging) because they are expensive batteries and the installation is permanent.


  • westbranchwestbranch Solar Expert Posts: 5,183 ✭✭✭✭
    Check out the MidNite Charge controllers, the Classics. Also ask over onthe Midnite forum too http://www.midnitesolar.com/ and http://www.midnitesolar.com/Forum/index.php
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
  • mike95490mike95490 Solar Expert Posts: 9,462 ✭✭✭✭✭
    Midnight can go that high I believe. For the 32V, the Morningstar controllers can be programed with a computer and a cable to 32V specs. But why have 2 different systems ?
    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

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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