Failed Transfer Switch

brulaz wrote:

lanerd wrote:
Recently, with my MH winterized in my rv garage and connected to 30 amps through a Surge Guard model 34850 and a 30 amp dog bone, my transfer switch failed and over a period of a couple of weeks, drained my 6 6v Interstate batteries to almost 0.
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So when the transfer switch failed, your inverter took over supplying 120VAC to ?

I'm surprised that in storage you had any 120VAC loads and/or the inverter turned on. Maybe it's a motorhome thing?

Or perhaps a 120VAC heater for winter storage?

On mine, I disconnect all loads (AC *and* DC) when put into storage, and just leave the solar to replenish the batt's self-discharge.

At the very least I would not leave the inverter on.

Yeah, you got me here. Prior to this happening, I had exercised my generator by running it with two of my three heat pumps for loads. Upon completion of this exercise, I turned off the generator, but my haste I failed to switch the thermostats to "OFF". So when the generator shut down, the transfer switch defaulted back to shore power and with two heat pumps restarting at the same time (the surge guard has a 30 sec delay), i suspect the transfer switch relay for the shore power couldn't handle the amperage load and failed and then when the system defaulted to inverter, the batteries were drained.

If this is indeed the cause of the failed relay, why didn't the main circuit breaker shut down when more than 30 amps was being drawn by the two heat pumps?