I usually wire inverters to not supply the battery charger and water heater.
You may want to change your AC wiring to do this.
Joe
Coquina

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Ron Ricci 
via CnC-List
Sent: Wednesday, September 02, 2015 1:41 PM
To: 'C&C List'
Cc: Ron Ricci
Subject: Re: Stus-List Hot water tank

My boat has a combination 120 VAC 1.5 kW electric/engine coolant hot water 
heater.  It holds 6 gallons of fresh water.  For grins, I tried it on the 
battery/inverter and it drew 117 amps DC.  This is consistent with the unit’s 
rating as the battery voltage dropped below 12 VDC when tried.  Since my 
alternator can only put out 55 amps and the battery cables are only #4 AWG, 
running the heater  with shore power does not seem practical.  I do not 
normally have AC shore power.  To prevent inadvertently turning on the heater, 
I disconnected the power feed at the circuit breaker.

The engine coolant part of the heater works great.  We can run the engine in 
the afternoon to recharge batteries and/or go to a mooring.  There is plenty of 
hot water for dinner dishes and a couple of quick showers.


Regards,
Ron
Ron Ricci
S/V Patriot
C&C 37+
Bristol, RI
ron.ri...@1968.usna.com<mailto:ron.ri...@1968.usna.com>




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