Hi, Steve, I was actually thinking of the same voltage, but smaller capacity to keep the cost and size down.
The idea was to remove all loads while charging.
I did not realise/grasp that it was a long-term intermittent issue.
You might be interested, in case you are not aware, that single phase AC electricity in the UK is 240 volts, this might give you sources for a switching setup. It might be easier to search UK items by using Google UK.
Maybe with two timers you could set it up so that one feeds the other, allowing the second timer to run only a portion of a day, so that in theory, you can end up with things like, example, a 20 day OFF, and one hour ON on the second timer, allowing control of a relay or whatever that switches after quite a few days, instead of daily.
Sounds like you have better plans than I can offer, anyway, so good luck with it.
John
1b. Re: re Battery Charger Posted by: "Steve Dolan" sdolan@scannersllc.com brzrkr22 Date: Wed Nov 14, 2012 7:41 am ((PST)) 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 bounc ed 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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