I have been using the Landis controller for years. I leave it plugged in all winter to maintain the charge.
 
At first I had some problems and returned it to Harry, and he repaired it under warranty. Later, Harry also sent me a new solid state relay when it failed, and I replaced that myself. However, for the last few years I have had a problem if I let the batteries get around 36 volts or a bit under that. It turns on for 5 minutes then shuts off like it is designed, but the voltage is still lower than the pickup voltage so it kicks back in immediately, then the relay starts short cycling VERY rapidly, which raises the amp draw until it trips the 30 amp breaker in my entrance panel. To get around this I installed a switch to bypass the controller, and I let it charge for a few hours, then the controller has some time between cycles, and works OK. 
 
Harry, if you are on this list - is this repairable by replacing the SS relay? Any ideas?
 
Erv Troyer   Lagrange, IN
reo43@aol.com
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In a message dated 10/12/2021 4:14:13 PM US Eastern Standard Time, Paul Holzschuher writes:
 
  1.  Battery charger and more (PH)
Hi Dean and all,I agree about your comments on the Landis. This is a great update for the ET charger.With the Landis, the pack stays charged to about 38.5 vdc.I modified Landis small pot, with a ten-turn larger pot and a counter dial.

Batteries are Exide GC-135 from Rural King and Rural King delivered the batteries to my home.The RK delivery guys would not leave until the batteries were installed to watch the C-185 in action.
In addition, I monitor the kwh before mowing with a Intertek power meter and normally usage is about 2.5 kwh after a one week charge.

Thanks,Paul HolzschuherLebanon Ohio