Steve
I do not know the specs of your Cummins but your information sounds sound depending on the size of your system.
I have mine set up to disable parts of my use when not on mains.
From the use I have had in the past I expect my 400 gallons of capacity that is reserved for the generator will run for 4 to 6 weeks if
I conserve my usage.
The most important limit is to shut down emergency heat on the heat pump (the repeater building does not have or need heat) that
is the largest single use and it is programed in to my system to be automatic.
Second is keep everything not necessary turned off and by doing this I only run around 20% of my capacity while leaving everything
active on demand.
I always leave my server room and repeater building on full power and have a backup diesel for the repeaters if needed (I have never needed it)
It will get too cold or too hot in my house depending on the time of year, but hot unbearable and I find this acceptable.
Roger
 

On 12/1/2025 3:33 PM, Steven Rutledge wrote:

My Cummins will run 69 hours on 250 gallons of propane at full load, or 125 hours on same amount of propane at half load.  On a thousand gallons of propane it will run my genset about 10 days if I have calculated correctly.  You can only put 800 gallons in a 1000 gallon tank.  That is about $1600 to $2400 dollars based on current prices if I'm correct.  That is almost my annual bill for electricity, water and natural gas.  I have run my genset for two weeks X 2 and four weeks X 1 and I didn't see much difference in my MLGW bill.  I'm no expert on propane but I have always been told it is expensive to run a whole house generator on propane.  It doesn't matter because we can't have propane tanks in Memphis.  Plus, in the wide-spread outages we have here I'm wondering how hard or easy it would be to get delivery.

I'd go with the two Hondas for your shack Jussi.

Steve, N4JQQ

On 12/1/2025 1:35 PM, Roger via ADXA wrote:
correction 3   250 gal tanks
Roge

On 12/1/2025 12:39 PM, Jussi Eloranta wrote:
Hi Roger,

Did you say that you have 3 x 20 gallon tanks? This is propane? I have 250 gallon propane tank that we occasionally use for heating. Perhaps I could hook up a generator to it as well.

I don't actually need power for the house - just the shack :-) So, a smaller generator would probably do.

Jussi (aa6kj) 

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