John,
NO such thing as a "stupid" idea! :o)
By low capacity I assume you mean a lower voltage?
The Propulsion bank is 144V that the shore power feeds through the charger.
The Propulsion bank then feeds a 144V step down charger/supply to a 12V house bank consisting of 3 200AH batteries so if there is a 12V draw on the house bank it recharges using the Propulsion bank. This way the Genset, shore power, and Regen is fed to the Propulsion bank down to everything else. Arby had the same idea I had, just stick it on a time clock to restart the charger every couple of weeks. Some issues with finding a time clock that is 240V, 24/7/365 or 30 day, small enough that it doesn't take up sq./ft, and doesn't cost as much as the boat. The battery pack consists of 12 AGM's that have all been checked out at least 2 times a year and this has been going on for several years. I should say this isn't a huge issue, the charger only shuts down after a few weeks at the dock, it's annoying if anything but there was 1 time that I believe it had shut down soon after I left and was off for a week with the frig/freezer running. Came back and the batteries where real low but bounced right back. I've checked for other parasitical loads and high resistance but to date have found none. The time clock may be the only answer besides shutting off the frig. I'm going to look into possibly a 120V relay system, run a timer off a 120V leg of the 240V and have it control a N/C relay at 240V inline to the charger. Thanks for the suggestions!
Steve in Solomons MD
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Hi,
I know that this is a simplistic idea, so ignore it if it is stupid, but
wouldn't it work if you had a low capacity second bank and a switch to
change the charging over, and a switch to change over the main load, so
that you can always be charging a battery pack that has no simultaneous
draw? This takes away any doubts regarding simultaneous charging/loads
etc., because there never are any such situations.
Or maybe you have a connection with high resistance somewhere that is
causing the load when appliances switch on, to affect the charging by
drawing from the charger rather than the battery(s)? Or a weak battery
that cannot supply the amps that are being drawn, again causing the
loading up from the charger.
John
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