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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Electrical Systems
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Old 08-20-2011
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Bridging heat pump across two circuits

We recently purchased a used Beneteau 411 which came with two 30 amp shore connections. Connection 1 powers all standard AC loads including battery charger, water heater, AC outlets, microwave, and AC lights. Connection 2 powers two heat pumps via separate circuit breakers. We have just signed up for a marina slip which will have a single 30 amp supply. We wonder if we can install a switch or circuit breaker to bridge one of the two heat pumps into the standard circuit. Obviously, we would then have to limit loads to avoid exceeding the 30amp limit. Is this idea otherwise viable? Suggestions or comments appreciated

Edit: seems I might need a double pole, double throw switch so that the heat pump can be connected to circuit 1 or 2, but never both simultaneously. I'm thinking that there could be a serious problem if the heat pump is simultaneously fed by both inputs
Pete

Last edited by prroots; 08-20-2011 at 06:28 PM. Reason: change title
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Old 08-20-2011
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depending on the year, your B should have a "bridge" breaker in the panel already...my 36CC in 1999 had it ...for sure if you have a generator. - What does your panel currently have in it for "mains"?

Else you would likely have to move or swap one AC load from one side to the other where the heat pump you want to use is currently at...

You do not want to feed either with two feeds of unknown phase.

as you say, you would need to watch your other ac loads to ensure that the total is not over 30amps, and I would check my shorepower cord daily for heat and good connection.
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Old 08-20-2011
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Marinco makes split shore power connectors
Y Adapter, 2-15/20 Amp Straight Blade To 30 Amp Locking | Marinco

You can install a simple relay on the control circuit of one heat pump, wire it so it "breaks" the control circuit to the other when the prior comes on.

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Old 08-20-2011
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Quote:
Originally Posted by deniseO30 View Post
Marinco makes split shore power connectors
Y Adapter, 2-15/20 Amp Straight Blade To 30 Amp Locking | Marinco

You can install a simple relay on the control circuit of one heat pump, wire it so it "breaks" the control circuit to the other when the prior comes on.

Congrats on boat!
Thanks. I think this is the correct product:
Y Adapter, 2-30 Amp Locking To 30 Amp Locking | Marinco
Pete
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